caver.rpc.klay

caver.rpc.klay provides JSON-RPC call with klay name space.

caver.rpc.klay.accountCreated


caver.rpc.klay.accountCreated(address [, blockNumber] [, callback])

Returns true if the account associated with the address is created in the kaia blockchain platform. It returns false otherwise.

Parameters

Name	Type	Description
address	string	The address of the account you want to query to see if it has been created on the network.
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns boolean

Type	Description
boolean	The existence of an input address in the kaia.

Example


> caver.rpc.klay.accountCreated('0x{address in hex}').then(console.log)
true

caver.rpc.klay.getAccount


caver.rpc.klay.getAccount(address [, blockNumber] [, callback])

Returns the account information of a given address in the kaia. For more details about the types of an account in kaia, please refer to Kaia Account Types.

NOTE caver.rpc.klay.getAccount returns the account that exists on the network, so null is returned if the account matching the address does not exist on the actual blockchain network.

Parameters

Name	Type	Description
address	string	The address of the account for which you want to get account information.
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	An object that contains the account information. Each account type has different attributes.

Example


// Get account with EOA
> caver.rpc.klay.getAccount('0x{address in hex}').then(console.log)
{
    accType: 1,
    account: {
        nonce: 0,
        balance: '0x',
        humanReadable: false,
        key: { keyType: 1, key: {} }
    }
}
// Get account with SCA
> caver.rpc.klay.getAccount('0x{address in hex}').then(console.log)
{
    accType: 2,
    account: {
        nonce: 1,
        balance: '0x0',
        humanReadable: false,
        key: { keyType: 3, key: {} },
        storageRoot: '0xd0ce6b9ba63cf727d48833bcaf69f398bb353e9a5b6235ac5bb3a8e95ff90ecf',
        codeHash: '7pemrmP8fcguH/ut/SYHJoUSecfUIcUyeCpMf0sBYVI=',
        codeFormat: 0
    }
}

caver.rpc.klay.getAccountKey


caver.rpc.klay.getAccountKey(address [, blockNumber] [, callback])

Returns AccountKey of a given address. If the account has AccountKeyLegacy or the account of the given address is a Smart Contract Account, it will return an empty key value. Please refer to Account Key for more details.

NOTE caver.rpc.klay.getAccountKey returns an object that differs by each AccountKey type. If a kaia account matching the given address does not exist in the network, null is returned.

Parameters

Name	Type	Description
address	string	The address of kaia account from which you want to get an object of AccountKey information.
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	An object that contains AccountKey information. Each AccountKey type has different attributes.

Example


// AccountKey type: AccountKeyLegacy
> caver.rpc.klay.getAccountKey('0x{address in hex}').then(console.log)
{ keyType: 1, key: {} }
// AccountKey type: AccountKeyPublic
> caver.rpc.klay.getAccountKey('0x{address in hex}').then(console.log)
{
    keyType: 2,
    key: { x:'0xb9a4b...', y:'0x7a285...' }
}
// AccountKey type: AccountKeyFail
> caver.rpc.klay.getAccountKey('0x{address in hex}').then(console.log)
{ keyType: 3, key:{} }
// AccountKey type: AccountKeyWeightedMultiSig
> caver.rpc.klay.getAccountKey('0x{address in hex}').then(console.log)
{
    keyType: 4,
    key: {
        threshold: 2,
        keys: [
            {
                weight: 1,
                key: { x: '0xae6b7...', y: '0x79ddf...' }
            },
            {
                weight: 1,
                key: { x: '0xd4256...', y: '0xfc5e7...' }
            },
            {
                weight: 1,
                key: { x: '0xd653e...', y: '0xe974e...' }
            }
        ]
    }
}
// AccountKey type: AccountKeyRoleBased
> caver.rpc.klay.getAccountKey('0x{address in hex}').then(console.log)
{
    keyType: 5,
    key: [
            {
                key: { x: '0x81965...', y: '0x18242...' },
                keyType: 2
            },
            {
                key: { x: '0x73363...', y: '0xfc3e3...' },
                keyType: 2
            },
            {
                key: { x: '0x95c92...', y: '0xef783...' },
                keyType: 2
            }
    ]
}

caver.rpc.klay.encodeAccountKey


caver.rpc.klay.encodeAccountKey(accountKey [, callback])

Encodes an object that contains AccountKey information using the Recursive Length Prefix (RLP) encoding scheme. Also you can use account.getRLPEncodingAccountKey to get RLP-encoded AccountKey.

Parameters

Name	Type	Description
accountKey	object	An object defines `keyType` and `key` inside or an instance of `AccountKey` (AccountKeyLegacy, AccountKeyPublic, AccountKeyFail, AccountKeyWeightedMultiSig or AccountKeyRoleBased).
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	A RLP-encoded AccountKey.

Example


// AccountKey type: AccountKeyLegacy
> caver.rpc.klay.encodeAccountKey({ keyType: 1, key: {} }).then(console.log)
0x01c0
// AccountKey type: AccountKeyPublic
> caver.rpc.klay.encodeAccountKey({
        keyType: 2,
        key: {
            x: '0xdbac81e8486d68eac4e6ef9db617f7fbd79a04a3b323c982a09cdfc61f0ae0e8',
            y: '0x906d7170ba349c86879fb8006134cbf57bda9db9214a90b607b6b4ab57fc026e',
        },
    }).then(console.log)
0x02a102dbac81e8486d68eac4e6ef9db617f7fbd79a04a3b323c982a09cdfc61f0ae0e8
// AccountKey type: AccountKeyFail
> caver.rpc.klay.encodeAccountKey({ keyType: 3, key: {} }).then(console.log)
0x03c0
// AccountKey type: AccountKeyWeightedMultiSig
> caver.rpc.klay.encodeAccountKey({
        keyType: 4,
        key: {
            threshold: 2,
            keys: [
                {
                    weight: 1,
                    key: {
                        x: '0xc734b50ddb229be5e929fc4aa8080ae8240a802d23d3290e5e6156ce029b110e',
                        y: '0x61a443ac3ffff164d1fb3617875f07641014cf17af6b7dc38e429fe838763712',
                    },
                },
                {
                    weight: 1,
                    key: {
                        x: '0x12d45f1cc56fbd6cd8fc877ab63b5092ac77db907a8a42c41dad3e98d7c64dfb',
                        y: '0x8ef355a8d524eb444eba507f236309ce08370debaa136cb91b2f445774bff842',
                    },
                },
            ],
        },
    }).then(console.log)
0x04f84b02f848e301a102c734b50ddb229be5e929fc4aa8080ae8240a802d23d3290e5e6156ce029b110ee301a10212d45f1cc56fbd6cd8fc877ab63b5092ac77db907a8a42c41dad3e98d7c64dfb
// AccountKey type: AccountKeyRoleBased
> caver.rpc.klay.encodeAccountKey({
        keyType: 5,
        key: [
            {
                keyType: 2,
                key: {
                    x: '0xe4a01407460c1c03ac0c82fd84f303a699b210c0b054f4aff72ff7dcdf01512d',
                    y: '0xa5735a23ce1654b14680054a993441eae7c261983a56f8e0da61280758b5919',
                },
            },
            {
                keyType: 4,
                key: {
                    threshold: 2,
                    keys: [
                        {
                            weight: 1,
                            key: {
                                x: '0xe4a01407460c1c03ac0c82fd84f303a699b210c0b054f4aff72ff7dcdf01512d',
                                y: '0xa5735a23ce1654b14680054a993441eae7c261983a56f8e0da61280758b5919',
                            },
                        },
                        {
                            weight: 1,
                            key: {
                                x: '0x36f6355f5b532c3c1606f18fa2be7a16ae200c5159c8031dd25bfa389a4c9c06',
                                y: '0x6fdf9fc87a16ac359e66d9761445d5ccbb417fb7757a3f5209d713824596a50d',
                            },
                        },
                    ],
                },
            },
            {
                keyType: 2,
                key: {
                    x: '0xc8785266510368d9372badd4c7f4a94b692e82ba74e0b5e26b34558b0f081447',
                    y: '0x94c27901465af0a703859ab47f8ae17e54aaba453b7cde5a6a9e4a32d45d72b2',
                },
            },
        ],
    }).then(console.log)
0x05f898a302a103e4a01407460c1c03ac0c82fd84f303a699b210c0b054f4aff72ff7dcdf01512db84e04f84b02f848e301a103e4a01407460c1c03ac0c82fd84f303a699b210c0b054f4aff72ff7dcdf01512de301a10336f6355f5b532c3c160
// Use an AccountKey instance
> const accountKey = caver.account.create('0x{address in hex}', '0xf1d2e...').accountKey
> caver.rpc.klay.encodeAccountKey(accountKey).then(console.log)
0x02a102f1d2e558cfa07151534cd406b1ac5c25d99e9c1cf925328d14fd15c6fe50df27

caver.rpc.klay.decodeAccountKey


caver.rpc.klay.decodeAccountKey(encodedKey [, callback])

Decodes a RLP-encoded AccountKey. Also you can use caver.account.accountKey.decode to decode a RLP-encoded AccountKey.

Parameters

Name	Type	Description
encodedKey	string	A RLP-encoded AccountKey.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	An object defines `keyType` and `key` inside.

Example


// AccountKey type: AccountKeyLegacy
> caver.rpc.klay.decodeAccountKey('0x01c0').then(console.log)
{ keyType: 1, key: {} }
// AccountKey type: AccountKeyPublic
> caver.rpc.klay.decodeAccountKey('0x02a102dbac81e8486d68eac4e6ef9db617f7fbd79a04a3b323c982a09cdfc61f0ae0e8').then(console.log)
{
    keyType: 2,
    key: {
        x: '0xdbac81e8486d68eac4e6ef9db617f7fbd79a04a3b323c982a09cdfc61f0ae0e8',
        y: '0x906d7170ba349c86879fb8006134cbf57bda9db9214a90b607b6b4ab57fc026e',
    },
}
// AccountKey type: AccountKeyFail
> caver.rpc.klay.decodeAccountKey('0x03c0').then(console.log)
{ keyType: 3, key: {} }
// AccountKey type: AccountKeyWeightedMultiSig
> caver.rpc.klay.decodeAccountKey('0x04f84b02f848e301a102c734b50ddb229be5e929fc4aa8080ae8240a802d23d3290e5e6156ce029b110ee301a10212d45f1cc56fbd6cd8fc877ab63b5092ac77db907a8a42c41dad3e98d7c64dfb').then(console.log)
{
    keyType: 4,
    key: {
        threshold: 2,
        keys: [
            {
                weight: 1,
                key: {
                    x: '0xc734b50ddb229be5e929fc4aa8080ae8240a802d23d3290e5e6156ce029b110e',
                    y: '0x61a443ac3ffff164d1fb3617875f07641014cf17af6b7dc38e429fe838763712',
                },
            },
            {
                weight: 1,
                key: {
                    x: '0x12d45f1cc56fbd6cd8fc877ab63b5092ac77db907a8a42c41dad3e98d7c64dfb',
                    y: '0x8ef355a8d524eb444eba507f236309ce08370debaa136cb91b2f445774bff842',
                },
            },
        ],
    },
}
// AccountKey type: AccountKeyRoleBased
> caver.rpc.klay.decodeAccountKey('0x05f898a302a103e4a01407460c1c03ac0c82fd84f303a699b210c0b054f4aff72ff7dcdf01512db84e04f84b02f848e301a103e4a01407460c1c03ac0c82fd84f303a699b210c0b054f4aff72ff7dcdf01512de301a10336f6355f5b532c3c160').then(console.log)
{
    keyType: 5,
    key: [
        {
            keyType: 2,
            key: {
                x: '0xe4a01407460c1c03ac0c82fd84f303a699b210c0b054f4aff72ff7dcdf01512d',
                y: '0xa5735a23ce1654b14680054a993441eae7c261983a56f8e0da61280758b5919',
            },
        },
        {
            keyType: 4,
            key: {
                threshold: 2,
                keys: [
                    {
                        weight: 1,
                        key: {
                            x: '0xe4a01407460c1c03ac0c82fd84f303a699b210c0b054f4aff72ff7dcdf01512d',
                            y: '0xa5735a23ce1654b14680054a993441eae7c261983a56f8e0da61280758b5919',
                        },
                    },
                    {
                        weight: 1,
                        key: {
                            x: '0x36f6355f5b532c3c1606f18fa2be7a16ae200c5159c8031dd25bfa389a4c9c06',
                            y: '0x6fdf9fc87a16ac359e66d9761445d5ccbb417fb7757a3f5209d713824596a50d',
                        },
                    },
                ],
            },
        },
        {
            keyType: 2,
            key: {
                x: '0xc8785266510368d9372badd4c7f4a94b692e82ba74e0b5e26b34558b0f081447',
                y: '0x94c27901465af0a703859ab47f8ae17e54aaba453b7cde5a6a9e4a32d45d72b2',
            },
        },
    ],
}

caver.rpc.klay.getBalance


caver.rpc.klay.getBalance(address [, blockNumber] [, callback])

Returns the balance of the account of the given address in kaia.

Parameters

Name	Type	Description
address	string	The address of the account for which you want to get balance.
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The current balance for the given address in peb.

Example


> caver.rpc.klay.getBalance('0x{address in hex}').then(console.log)
0xde0b6b3a7640000

caver.rpc.klay.getCode


caver.rpc.klay.getCode(address [, blockNumber] [, callback])

Returns code at a given address.

Parameters

Name	Type	Description
address	string	The address to get the code from.
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The code from the given address.

Example


> caver.rpc.klay.getCode('0x{address in hex}').then(console.log)
0x60806...

caver.rpc.klay.getTransactionCount


caver.rpc.klay.getTransactionCount(address [, blockNumber] [, callback])

Returns the total number of transactions sent from an address.

Parameters

Name	Type	Description
address	string	The address to get the number of transactions from.
blockNumber	number \| string	(optional) A block number, the string `pending` for the pending nonce, or the string `earliest` or `latest` as in the default block parameter. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The number of transactions sent from the given address in hex.

Example


> caver.rpc.klay.getTransactionCount('0x{address in hex}').then(console.log)
0x5f

caver.rpc.klay.isContractAccount


caver.rpc.klay.isContractAccount(address [, blockNumber] [, callback])

Returns true if an input account has a non-empty codeHash at the time of a specific block number. It returns false if the account is an EOA or a smart contract account which doesn't have codeHash. Please refer to Smart Contract Account for more details.

Parameters

Name	Type	Description
address	string	The address you want to check for isContractAccount.
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns boolean

Type	Description
boolean	true means the input parameter is an existing smart contract address.

Example


> caver.rpc.klay.isContractAccount('0x{address in hex}').then(console.log)
false
> caver.rpc.klay.isContractAccount('0x{address in hex}').then(console.log)
true

caver.rpc.klay.sign


caver.rpc.klay.sign(address, message [, blockNumber] [, callback])

Generates signed data specific to the kaia. Refer to Kaia Platform API - klay_sign to know how the signature is generated.

NOTE: This API provides the function to sign a message using an imported account in your kaia node. The imported account in your node must be unlocked to sign the message. To sign a transaction with imported account in your kaia node, use caver.rpc.klay.signTransaction.

Parameters

Name	Type	Description
address	String	The address of the imported account to sign the message.
message	String	Message to sign.
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The signature made from an imported account.

Example


> caver.rpc.klay.sign('0x{address in hex}', '0xdeadbeaf').then(console.log)
0x1066e052c4be821daa4d0a0cd1e9e75ccb200bb4001c2e38853ba41b712a5a226da2acd67c86a13b266e0d75d0a6e7d1551c8924af413267615a5948617c746c1c

caver.rpc.klay.getAccounts


caver.rpc.klay.getAccounts([callback])

Returns a list of addresses owned by the kaia Node.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns Array

Type	Description
Array	An array of addresses owned by the kaia Node.

Example


> caver.rpc.klay.getAccounts().then(console.log)
[
    '0xe1531e916857d1b3a7db92f9187b96a7b43813bf',
    '0x75331c25535052157ff5110ba7d0cf940d3a9ca6'
]

caver.rpc.klay.getBlockNumber


caver.rpc.klay.getBlockNumber([callback])

Returns the number of the most recent block.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The number of the most recent block in hex.

Example


> caver.rpc.klay.getBlockNumber().then(console.log)
0x5d39

caver.rpc.klay.getHeader


caver.rpc.klay.getHeader(blockNumberOrHash [, callback])

Returns a block header by block hash or block number. If the user passes the block hash as a parameter, caver.rpc.klay.getHeaderByHash is called, and if the block number is called as a parameter, caver.rpc.klay.getHeaderByNumber is called.

Parameters

Name	Type	Description
blockNumberOrHash	number \| string	The block hash, number or the block tag string.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	A block header object. For a detailed description of the return value, please refer to caver.rpc.klay.getHeaderByHash.

Example


> caver.rpc.klay.getHeader(1).then(console.log)
{
  baseFeePerGas: '0x0',
  blockScore: '0x1',
  extraData: '0xd8830...',
  gasUsed: '0x0',
  governanceData: '0x',
  hash: '0x1b6582f0908add2221317288482aada596551e9f9d779a2aebc55d81d3149ba3',
  logsBloom: '0x00000...',
  number: '0xbacd3',
  parentHash: '0xd6e36611a6722b94b8e4bb4d164755445409cf43aa5db0a5d4ae01e621c81ce7',
  receiptsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470',
  reward: '0x30be91c80566da777d30e659b6746174ecc61576',
  stateRoot: '0xe75d808889451b1dac3d209e8cfbb2159ea6b2a080ce6081be775fb426f047a8',
  timestamp: '0x62201975',
  timestampFoS: '0x0',
  transactionsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470'
}

caver.rpc.klay.getHeaderByNumber


caver.rpc.klay.getHeaderByNumber(blockNumber [, returnTransactionObjects] [, callback])

Returns a block header by block number.

Parameters

Name	Type	Description
blockNumber	number \| string	The block number or the block tag string.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	A block header object. For a detailed description of the return value, please refer to caver.rpc.klay.getHeaderByHash.

Example


> caver.rpc.klay.getHeaderByNumber(765139).then(console.log)
{
  baseFeePerGas: '0x0',
  blockScore: '0x1',
  extraData: '0xd8830...',
  gasUsed: '0x0',
  governanceData: '0x',
  hash: '0x1b6582f0908add2221317288482aada596551e9f9d779a2aebc55d81d3149ba3',
  logsBloom: '0x00000...',
  number: '0xbacd3',
  parentHash: '0xd6e36611a6722b94b8e4bb4d164755445409cf43aa5db0a5d4ae01e621c81ce7',
  receiptsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470',
  reward: '0x30be91c80566da777d30e659b6746174ecc61576',
  stateRoot: '0xe75d808889451b1dac3d209e8cfbb2159ea6b2a080ce6081be775fb426f047a8',
  timestamp: '0x62201975',
  timestampFoS: '0x0',
  transactionsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470'
}

caver.rpc.klay.getHeaderByHash


caver.rpc.klay.getHeaderByHash(blockHash [, returnTransactionObjects] [, callback])

Returns the block number of the most recent block by using blockHash.

Parameters

Name	Type	Description
blockHash	string	The block hash.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object - An object includes the block header:

Name	Type	Description
baseFeePerGas	string	The base fee per gas. This value is returned only when EthTxTypeCompatibleBlock is activated for that block number.
blockScore	string	The difficulty of mining in the blockchain network. The use of `blockScore` differs from the consensus of the network. Always 1 in the BFT consensus engine.
extraData	string	The "extra data" field of this block.
gasUsed	string	The gas in total that was used by all transactions in this block.
governanceData	string	RLP encoded governance configuration
hash	string	Hash of the block. `null` when it is a pending block.
logsBloom	string	The bloom filter for the logs of the block. `null` when it is a pending block.
number	string	The block number. `null` when it is a pending block.
parentHash	string	Hash of the parent block.
receiptsRoot	string	The root of the receipts trie of the block.
reward	string	The address of the beneficiary to whom the block rewards were given.
stateRoot	string	The root of the final state trie of the block.
timestamp	string	The unix timestamp for when the block was collated.
timestampFoS	string	The fraction of a second of the timestamp for when the block was collated.
transactionsRoot	string	The root of the transaction trie of the block.

Example


> caver.rpc.klay.getHeaderByHash('0x1b6582f0908add2221317288482aada596551e9f9d779a2aebc55d81d3149ba3').then(console.log)
{
  baseFeePerGas: '0x0',
  blockScore: '0x1',
  extraData: '0xd8830...',
  gasUsed: '0x0',
  governanceData: '0x',
  hash: '0x1b6582f0908add2221317288482aada596551e9f9d779a2aebc55d81d3149ba3',
  logsBloom: '0x00000...',
  number: '0xbacd3',
  parentHash: '0xd6e36611a6722b94b8e4bb4d164755445409cf43aa5db0a5d4ae01e621c81ce7',
  receiptsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470',
  reward: '0x30be91c80566da777d30e659b6746174ecc61576',
  stateRoot: '0xe75d808889451b1dac3d209e8cfbb2159ea6b2a080ce6081be775fb426f047a8',
  timestamp: '0x62201975',
  timestampFoS: '0x0',
  transactionsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470'
}

caver.rpc.klay.getBlock


caver.rpc.klay.getBlock(blockNumberOrHash [, returnTransactionObjects] [, callback])

Returns information about a block by block hash or block number. If the user passes the block hash as a parameter, caver.rpc.klay.getBlockByHash is called, and if the block number is called as a parameter, caver.rpc.klay.getBlockByNumber is called.

Parameters

Name	Type	Description
blockNumberOrHash	number \| string	The block hash, number or the block tag string.
returnTransactionObjects	boolean	(optional, default `false`) If `true`, the returned block will contain all transactions as objects, and if `false`, it will only contain the transaction hashes.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	A block object. For a detailed description of the return value, please refer to caver.rpc.klay.getBlockByHash.

Example


> caver.rpc.klay.getBlock(1).then(console.log)
{
    baseFeePerGas: '0x0',
    blockscore: '0x1',
    extraData: '0xd8830...',
    gasUsed: '0x0',
    governanceData: '0x',
    hash: '0x58482921af951cf42a069436ac9338de50fd963bdbea40e396f416f9ac96a08b',
    logsBloom: '0x00000...',
    number: '0x1',
    parentHash: '0x6b7c0a49f445d39b6d7dc9ba5b593b326f3a953e75ff1fcf64b9a5fa51c2725b',
    receiptsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470',
    reward: '0xddc2002b729676dfd906484d35bb02a8634d7040',
    size: '0x285',
    stateRoot: '0xb88b6110e6f73b732714bb346e6ff24beb480c0dc901a55be24e38ad1c6d5fa9',
    timestamp: '0x5ee7fe9f',
    timestampFoS: '0xd',
    totalBlockScore: '0x2',
    transactions: [],
    transactionsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470',
    voteData: '0x',
}

caver.rpc.klay.getBlockByNumber


caver.rpc.klay.getBlockByNumber(blockNumber [, returnTransactionObjects] [, callback])

Returns information about a block by block number.

Parameters

Name	Type	Description
blockNumber	number \| string	The block number or the block which is tagged with a string (`genesis` or `latest`).
returnTransactionObjects	boolean	(optional, default `false`) If `true`, the returned block will contain all transactions as objects, and if `false`, it will only contain the transaction hashes.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	A block object. For detailed description of return value, please refer to caver.rpc.klay.getBlockByHash.

Example


> caver.rpc.klay.getBlockByNumber(1).then(console.log)
{
    baseFeePerGas: '0x0',
    blockscore: '0x1',
    extraData: '0xd8830...',
    gasUsed: '0x0',
    governanceData: '0x',
    hash: '0x58482921af951cf42a069436ac9338de50fd963bdbea40e396f416f9ac96a08b',
    logsBloom: '0x00000...',
    number: '0x1',
    parentHash: '0x6b7c0a49f445d39b6d7dc9ba5b593b326f3a953e75ff1fcf64b9a5fa51c2725b',
    receiptsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470',
    reward: '0xddc2002b729676dfd906484d35bb02a8634d7040',
    size: '0x285',
    stateRoot: '0xb88b6110e6f73b732714bb346e6ff24beb480c0dc901a55be24e38ad1c6d5fa9',
    timestamp: '0x5ee7fe9f',
    timestampFoS: '0xd',
    totalBlockScore: '0x2',
    transactions: [],
    transactionsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470',
    voteData: '0x'
}

caver.rpc.klay.getBlockByHash


caver.rpc.klay.getBlockByHash(blockHash [, returnTransactionObjects] [, callback])

Returns the block number of the most recent block by using blockHash.

Parameters

Name	Type	Description
blockHash	string	The block hash.
returnTransactionObjects	boolean	(optional, default `false`) If `true`, the returned block will contain all transactions as objects, and if `false`, it will only contain the transaction hashes.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object - An object includes block:

Name	Type	Description
baseFeePerGas	string	The base fee per gas. This value is returned only when EthTxTypeCompatibleBlock is activated for that block number.
blockScore	string	The difficulty of mining in the blockchain network. The use of `blockScore` differs from the consensus of the network. Always 1 in the BFT consensus engine.
extraData	string	The "extra data" field of this block.
gasUsed	string	The gas in total that was used by all transactions in this block.
governanceData	string	RLP encoded governance configuration
hash	string	Hash of the block. `null` when it is a pending block.
logsBloom	string	The bloom filter for the logs of the block. `null` when it is a pending block.
number	string	The block number. `null` when it is a pending block.
parentHash	string	Hash of the parent block.
receiptsRoot	string	The root of the receipts trie of the block.
reward	string	The address of the beneficiary to whom the block rewards were given.
size	string	Integer the size of this block in bytes.
stateRoot	string	The root of the final state trie of the block.
timestamp	string	The unix timestamp for when the block was collated.
timestampFoS	string	The fraction of a second of the timestamp for when the block was collated.
totalBlockScore	string	Integer of the total blockScore of the chain until this block.
transactions	Array	Array of transaction objects, or 32-byte transaction hashes depending on the `returnTransactionObjects` parameter.
transactionsRoot	string	The root of the transaction trie of the block.
voteData	string	RLP encoded governance vote of the proposer.

Example


> caver.rpc.klay.getBlockByHash('0x58482921af951cf42a069436ac9338de50fd963bdbea40e396f416f9ac96a08b').then(console.log)
{
    baseFeePerGas: '0x0',
    blockscore: '0x1',
    extraData: '0xd8830...',
    gasUsed: '0x0',
    governanceData: '0x',
    hash: '0x58482921af951cf42a069436ac9338de50fd963bdbea40e396f416f9ac96a08b',
    logsBloom: '0x00000...',
    number: '0x1',
    parentHash: '0x6b7c0a49f445d39b6d7dc9ba5b593b326f3a953e75ff1fcf64b9a5fa51c2725b',
    receiptsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470',
    reward: '0xddc2002b729676dfd906484d35bb02a8634d7040',
    size: '0x285',
    stateRoot: '0xb88b6110e6f73b732714bb346e6ff24beb480c0dc901a55be24e38ad1c6d5fa9',
    timestamp: '0x5ee7fe9f',
    timestampFoS: '0xd',
    totalBlockScore: '0x2',
    transactions: [],
    transactionsRoot: '0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470',
    voteData: '0x'
}

caver.rpc.klay.getBlockReceipts


caver.rpc.klay.getBlockReceipts(blockHash [, callback])

Returns receipts included in a block identified by block hash.

Parameters

Name	Type	Description
blockHash	string	The block hash.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns Array

Type	Description
Array	The transaction receipts included in a block. If the target block contains no transaction, an empty array `[]` is returned. For detailed description of transaction receipt, please refer to caver.rpc.klay.getTransactionReceipt.

Example


> caver.rpc.klay.getBlockReceipts('0x4584bea6b8b2abe7f024d1e63dd0571cfd28cd5157b4f6cb2ac4160a7b0057e0').then(console.log)
[ 
    {
        blockHash: '0x4584bea6b8b2abe7f024d1e63dd0571cfd28cd5157b4f6cb2ac4160a7b0057e0',
        blockNumber: '0x5301',
        contractAddress: null,
        from: '0xddc2002b729676dfd906484d35bb02a8634d7040',
        gas: '0x61a8',
        gasPrice: '0x5d21dba00',
        gasUsed: '0x5208',
        logs: [],
        logsBloom: '0x00000...',
        nonce: '0x5e',
        senderTxHash: '0x413f080a498ae3973490c2f80e75e6a492cfcdac8be8051220bb7a964768d28c',
        signatures: [
            { 
                V: '0x4e44',
                R: '0x98583ffa8d9a6d5f9e60e4daebb33f18e8ad4d32653c4a2fa7f12ce025af763d',
                S: '0x9b9e5257293e3b986842b6a203dd16ce46f16ed42dd3e9592fcaab9ea2696cb'
            }    
        ],
        status: '0x1',
        to: '0xc0aabc441129991dd3a9363a9a43b745527ea4e7',
        transactionHash: '0x413f080a498ae3973490c2f80e75e6a492cfcdac8be8051220bb7a964768d28c',
        transactionIndex: '0x0',
        type: 'TxTypeValueTransfer',
        typeInt: 8,
        value: '0xde0b6b3a7640000'
    }
]

caver.rpc.klay.getBlockTransactionCountByNumber


caver.rpc.klay.getBlockTransactionCountByNumber(blockNumber [, callback])

Returns the number of transactions in a block matching the given block number.

Parameters

Name	Type	Description
blockNumber	number \| string	The block number or the block tag string (`genesis` or `latest`).
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The number of transactions in the given block in hex.

Example


> caver.rpc.klay.getBlockTransactionCountByNumber(21249).then(console.log)
0x1

caver.rpc.klay.getBlockTransactionCountByHash


caver.rpc.klay.getBlockTransactionCountByHash(blockHash [, callback])

Returns the number of transactions in a block matching the given block hash.

Parameters

Name	Type	Description
blockHash	string	The block hash.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The number of transactions in the given block in hex.

Example


> caver.rpc.klay.getBlockTransactionCountByHash('0x4584bea6b8b2abe7f024d1e63dd0571cfd28cd5157b4f6cb2ac4160a7b0057e0').then(console.log)
0x1

caver.rpc.klay.getBlockWithConsensusInfoByNumber


caver.rpc.klay.getBlockWithConsensusInfoByNumber(blockNumber [, callback])

Returns a block with consensus information matched by the given block number.

Parameters

Name	Type	Description
blockNumber	number \| string	The block number or the block tag string (`genesis` or `latest`).
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
string	An object includes block with consensus information. For detailed description of return value, please refer to caver.rpc.klay.getBlockWithConsensusInfoByHash.

Example


> caver.rpc.klay.getBlockWithConsensusInfoByNumber(21249).then(console.log)
{
    blockscore: '0x1',
    committee: ['0xddc2002b729676dfd906484d35bb02a8634d7040', '0xa1d2665c4c9f77410844dd4c22ed11aabbd4033e'],
    extraData: '0xd8830...',
    gasUsed: '0x5208',
    governanceData: '0x',
    hash: '0x4584bea6b8b2abe7f024d1e63dd0571cfd28cd5157b4f6cb2ac4160a7b0057e0',
    logsBloom: '0x00000...',
    number: '0x5301',
    parentHash: '0x024f05c0e7428e33331104bedbfc453d481ce6a2f5e57f7fd68a4391ba6c2619',
    proposer: '0xa1d2665c4c9f77410844dd4c22ed11aabbd4033e',
    receiptsRoot: '0xe38e5532717f12f769b07ea016014bd39b74fb72def4de8442114cc2728609f2',
    reward: '0xb74837f495060f3f794dcae8fa3e0c5d3cf99d9f',
    size: '0x313',
    stateRoot: '0x9964b2d8f23da7383a32ec33c9700a76ebf4a36315c9067c2fef7568d97e1d55',
    timestamp: '0x5ee851dd',
    timestampFoS: '0x0',
    totalBlockScore: '0x5302',
    transactions: [
        {
            blockHash: '0x4584bea6b8b2abe7f024d1e63dd0571cfd28cd5157b4f6cb2ac4160a7b0057e0',
            blockNumber: '0x5301',
            contractAddress: null,
            from: '0xddc2002b729676dfd906484d35bb02a8634d7040',
            gas: '0x61a8',
            gasPrice: '0x5d21dba00',
            gasUsed: '0x5208',
            logs: [],
            logsBloom: '0x00000...',
            nonce: '0x5e',
            senderTxHash: '0x413f080a498ae3973490c2f80e75e6a492cfcdac8be8051220bb7a964768d28c',
            signatures: {
                V: '0x4e44',
                R: '0x98583ffa8d9a6d5f9e60e4daebb33f18e8ad4d32653c4a2fa7f12ce025af763d',
                S: '0x9b9e5257293e3b986842b6a203dd16ce46f16ed42dd3e9592fcaab9ea2696cb'
            },
            status: '0x1',
            to: '0xc0aabc441129991dd3a9363a9a43b745527ea4e7',
            transactionHash: '0x413f080a498ae3973490c2f80e75e6a492cfcdac8be8051220bb7a964768d28c',
            transactionIndex: '0x0',
            type: 'TxTypeValueTransfer',
            typeInt: 8,
            value: '0xde0b6b3a7640000',
        },
    ],
    transactionsRoot: '0x413f080a498ae3973490c2f80e75e6a492cfcdac8be8051220bb7a964768d28c',
    voteData: '0x',
}

caver.rpc.klay.getBlockWithConsensusInfoByHash


caver.rpc.klay.getBlockWithConsensusInfoByHash(blockHash [, callback])

Returns a block with consensus information matched by the given hash.

Parameters

Name	Type	Description
blockHash	string	The block hash.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object - A block object with consensus information (a proposer and a list of committee members), or null when no block was found:

Name	Type	Description
blockScore	string	Former difficulty. Always 1 in the BFT consensus engine
committee	Array	Array of addresses of committee members of this block. The committee is a subset of validators who participated in the consensus protocol for this block.
extraData	string	The "extra data" field of this block.
gasUsed	string	The gas in total that was used by all transactions in this block.
governanceData	string	RLP encoded governance configuration
hash	string	Hash of the block. `null` when it is a pending block.
logsBloom	string	The bloom filter for the logs of the block. `null` when it is a pending block.
number	string	The block number. `null` when it is a pending block.
originProposer	string	The proposal of 0 round at the same block number.
parentHash	string	Hash of the parent block.
proposer	string	The address of the block proposer.
receiptsRoot	string	The root of the receipts trie of the block.
reward	string	The address of the beneficiary to whom the block rewards were given.
round	number	The round number.
size	string	Integer the size of this block in bytes.
stateRoot	string	The root of the final state trie of the block.
timestamp	string	The unix timestamp for when the block was collated.
timestampFoS	string	The fraction of a second of the timestamp for when the block was collated.
totalBlockScore	string	Integer of the total blockScore of the chain until this block.
transactions	Array	Array of transaction objects.
transactionsRoot	string	The root of the transaction trie of the block.
voteData	string	RLP encoded governance vote of the proposer

Example


> caver.rpc.klay.getBlockWithConsensusInfoByHash('0x4584bea6b8b2abe7f024d1e63dd0571cfd28cd5157b4f6cb2ac4160a7b0057e0').then(console.log)
{
    blockscore: '0x1',
    committee: [ '0x571e5...', '0x5cb1a...', '0x99fb1...', '0xb74ff...' ],
    extraData: '0xd8830...',
    gasUsed: '0x3ea49',
    governanceData: '0x',
    hash: '0x188d4531d668ae3da20d70d4cb4c5d96a0cc5190771f0920c56b461c4d356566',
    logsBloom: '0x00000...',
    number: '0x3f79aa7',
    originProposer: '0x99fb17d324fa0e07f23b49d09028ac0919414db6',
    parentHash: '0x777d344c8c59c4d8d0041bb4c2ee66e95ec110303fb59d3e329f80e7a9c9c617',
    proposer: '0x99fb17d324fa0e07f23b49d09028ac0919414db6',
    receiptsRoot: '0xffbae3190f858531ff785bcbdc70278d91c3d9becdd8b134b0ab7974b9ef3641',
    reward: '0xb2bd3178affccd9f9f5189457f1cad7d17a01c9d',
    round: 0,
    size: '0x507',
    stateRoot: '0xa60d0868bd41b63b4fd67e5a8f801c5949e89a8994a13426747890b77d6bc0c4',
    timestamp: '0x610b3164',
    timestampFoS: '0xc',
    totalBlockScore: '0x3f79aa8',
    transactions: [
        {
            blockHash: '0x188d4531d668ae3da20d70d4cb4c5d96a0cc5190771f0920c56b461c4d356566',
            blockNumber: '0x3f79aa7',
            contractAddress: null,
            feePayer: '0xfee998d423d5bd2bf5b5c0f0acb4e3aae2bd2286',
            feePayerSignatures: [
                {
                    V: '0x7f5',
                    R: '0xf9aff6f39feb7a18d3e1b8ab9f590f0227e465c72cfe05e8d7c9e390cbf1d349',
                    S: '0x6e7317d121a3951a8cbca110be8cc86c5314349f8fb1c37f9af4cadf72fe89ec',
                },
            ],
            from: '0x11eb23f57151a88d4bb53cc9c27355437138c278',
            gas: '0x2dc6c0',
            gasPrice: '0x5d21dba00',
            gasUsed: '0x3ea49',
            input: '0x850ba...',
            logs: [
                {
                    address: '0x78ca9a1105c3392b56625f3fcfd149b29322c56f',
                    topics: [ '0xddf25...', '0x00000...', '0x00000...', '0x00000...' ],
                    data: '0x',
                    blockNumber: '0x3f79aa7',
                    transactionHash: '0x109d2836d9fde9d8081a27dd6ac545fd7a53530a56bdc40f2a11e5d6dbc2a09f',
                    transactionIndex: '0x0',
                    blockHash: '0x188d4531d668ae3da20d70d4cb4c5d96a0cc5190771f0920c56b461c4d356566',
                    logIndex: '0x0',
                    removed: false,
                },
            ],
            logsBloom: '0x00000...',
            nonce: '0x0',
            senderTxHash: '0xeca2d3650403a1e27af0bbe9878dcbb248d764fc88751f35a6e05636d2ad9e78',
            signatures: [
                {
                    V: '0x7f6',
                    R: '0x9ea78985b004afa86acd455c017da374ec1aec885f963ec8134a38f7ede451b0',
                    S: '0xfac0e417f7f7b15023e3f5ac95f1fb5b3280746a2eff04394ddedbdd259fc1',
                },
            ],
            status: '0x1',
            to: '0x78ca9a1105c3392b56625f3fcfd149b29322c56f',
            transactionHash: '0x109d2836d9fde9d8081a27dd6ac545fd7a53530a56bdc40f2a11e5d6dbc2a09f',
            transactionIndex: '0x0',
            type: 'TxTypeFeeDelegatedSmartContractExecution',
            typeInt: 49,
            value: '0x0',
        },
    ],
    transactionsRoot: '0x109d2836d9fde9d8081a27dd6ac545fd7a53530a56bdc40f2a11e5d6dbc2a09f',
    voteData: '0x',
}

caver.rpc.klay.getCommittee


caver.rpc.klay.getCommittee([blockNumber] [, callback])

Returns a list of all validators in the committee at the specified block.

Parameters

Name	Type	Description
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns Array

Type	Description
Array	Addresses of all validators in the committee at the given block.

Example


> caver.rpc.klay.getCommittee().then(console.log)
[
    '0xddc2002b729676dfd906484d35bb02a8634d7040',
    '0xa1d2665c4c9f77410844dd4c22ed11aabbd4033e'
]

caver.rpc.klay.getCommitteeSize


caver.rpc.klay.getCommitteeSize([blockNumber] [, callback])

Returns the size of the committee at the specified block.

Parameters

Name	Type	Description
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns number

Type	Description
number	The size of the committee at the given block.

Example


> caver.rpc.klay.getCommitteeSize().then(console.log)
2

caver.rpc.klay.getCouncil


caver.rpc.klay.getCouncil([blockNumber] [, callback])

Returns a list of all validators of the council at the specified block.

Parameters

Name	Type	Description
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns Array

Type	Description
Array	An array of validator addresses of the council at the given block, or null when no council was found.

Example


> caver.rpc.klay.getCouncil().then(console.log)
[
    '0xa1d2665c4c9f77410844dd4c22ed11aabbd4033e',
    '0xddc2002b729676dfd906484d35bb02a8634d7040'
]

caver.rpc.klay.getCouncilSize


caver.rpc.klay.getCouncilSize([blockNumber] [, callback])

Returns the size of the council at the specified block.

Parameters

Name	Type	Description
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns number

Type	Description
number	The size of the council at the given block.

Example


> caver.rpc.klay.getCouncilSize().then(console.log)
2

caver.rpc.klay.getStorageAt


caver.rpc.klay.getStorageAt(address, position [, blockNumber] [, callback])

Returns the value from a storage position at a given address.

Parameters

Name	Type	Description
address	string	The address to get the storage from.
position	number	The index position of the storage. For more information on `calculating the position`, refer to klay_getStorageAt.
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The value at this storage position.

Example


> caver.rpc.klay.getStorageAt('0x407d73d8a49eeb85d32cf465507dd71d507100c1', 0).then(console.log)
0x033456732123ffff2342342dd12342434324234234fd234fd23fd4f23d4234

caver.rpc.klay.isMinting


caver.rpc.klay.isMinting([callback])

Returns true if client is actively mining new blocks.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, which returns an error object as the first parameter and the result as the second.

Return Value

Promise returns boolean - true if the client is mining, otherwise false.

Example


> caver.rpc.klay.isMinting().then(console.log)
true

caver.rpc.klay.isSyncing


caver.rpc.klay.isSyncing([callback])

Returns an object with data about the sync status or false.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object|boolean - false if the kaia Node is not syncing. Otherwise, a sync object is returned:

Name	Type	Description
startingBlock	string	The block number in hex where the sync started.
currentBlock	string	The block number in hex where the node currently synced to.
highestBlock	string	The estimated block number in hex to sync to.
knownStates	string	The estimated states in hex to download.
pulledStates	string	The already downloaded states in hex.

Example


> caver.rpc.klay.isSyncing().then(console.log)
{
        startingBlock: 100,
        currentBlock: 312,
        highestBlock: 512,
        knownStates: 234566,
        pulledStates: 123455
}
> caver.rpc.klay.isSyncing().then(console.log)
false

caver.rpc.klay.call


caver.rpc.klay.call(callObject [, blockNumber] [, callback])

Executes a new message call immediately without sending a transaction on the blockchain. It returns data or an error object of JSON RPC if an error occurs.

Parameters

Name	Type	Description
callObject	object	A transaction call object. See the next table for the object's properties.
blockNumber	number \| string	(optional) A block number, or the string `latest` or `earliest`. If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

callObject has the following properties:

Name	Type	Description
to	string	(optional when testing the deployment of a new contract) The address the transaction is directed to.
input	string	(optional) The hash of the method signature and encoded parameters. You can use caver.abi.encodeFunctionCall.
from	string	(optional) The address the transaction is sent from.
gas	string	(optional) The gas provided for the transaction execution. `klay_call` consumes zero gas, but this parameter may be needed by some executions.
gasPrice	string	(optional) The gasPrice used for each paid gas.
value	string	(optional) The value sent with this transaction in `peb`.

Return Value

Promise returns string

Type	Description
string	The returned data of the call. e.g., the return value of a smart contract function.

Example


> caver.rpc.klay.call({ 
        to: '0x5481a10a47C74f800BDF4955BD77550881bde91C', // contract address
        input: '0x70a08231000000000000000000000000ddc2002b729676dfd906484d35bb02a8634d7040'
    }).then(console.log)
0x0000000000000000000000000000000000000000000000000de0b6b3a7640000

caver.rpc.klay.estimateGas


caver.rpc.klay.estimateGas(callObject [, blockNumber] [, callback])

Generates and returns an estimate of how much gas is necessary to allow a transaction to complete. The transaction from this method will not be added to the blockchain.

Parameters

See caver.rpc.klay.call parameters, expect that all properties are optional.

Return Value

Promise returns string

Type	Description
string	The amount of gas used.

Example


> caver.rpc.klay.estimateGas({ 
        to: '0x5481a10a47C74f800BDF4955BD77550881bde91C', // contract address
        input: '0x095ea7b300000000000000000000000028e4e077686d1aeaf54a1313ff4841181056fe32000000000000000000000000000000000000000000000000000000000000000a'
    }).then(console.log)
0xb2a0

caver.rpc.klay.estimateComputationCost


caver.rpc.klay.estimateComputationCost(callObject [, blockNumber] [, callback])

Generates and returns an estimate of how much computation cost will be spent to execute the transaction. kaia limits the computation cost of a transaction to 100000000 currently not to take too much time by a single transaction. The transaction will not be added to the blockchain like caver.rpc.klay.estimateGas.

Parameters

See caver.rpc.klay.call parameters, expect that all properties are optional.

Return Value

Promise returns string

Type	Description
string	The amount of computation cost used.

Example


> caver.rpc.klay.estimateComputationCost({ 
        to: '0x5481a10a47C74f800BDF4955BD77550881bde91C', // contract address
        input: '0x095ea7b300000000000000000000000028e4e077686d1aeaf54a1313ff4841181056fe32000000000000000000000000000000000000000000000000000000000000000a'
    }).then(console.log)
0xd761

caver.rpc.klay.getTransactionByBlockHashAndIndex


caver.rpc.klay.getTransactionByBlockHashAndIndex(blockHash, index [, callback])

Returns information about a transaction by block hash and transaction index position.

Parameters

Name	Type	Description
blockHash	string	The block hash.
index	number	A transaction index position inside the block.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	A transaction object, see caver.rpc.klay.getTransactionByHash for more detail.

Example


> caver.rpc.klay.getTransactionByBlockHashAndIndex('0xc9f643c0ebe84932c10695cbc9eb75228af09516931b58952de3e12c21a50576', 0).then(console.log)
{
    blockHash: '0xc9f643c0ebe84932c10695cbc9eb75228af09516931b58952de3e12c21a50576',
    blockNumber: '0xb7',
    from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
    gas: '0x61a8',
    gasPrice: '0x5d21dba00',
    hash: '0xdb63fb385e51fbfd84a98873c994aef622c5f1c72c5760a9ff95c55bbfd99898',
    nonce: '0x0',
    senderTxHash: '0xdb63fb385e51fbfd84a98873c994aef622c5f1c72c5760a9ff95c55bbfd99898',
    signatures: [ { V: '0x4e44', R: '0xf1a9a...', S: '0x9116c...' } ],
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    transactionIndex: '0x0',
    type: 'TxTypeValueTransfer',
    typeInt: 8,
    value: '0x8ac7230489e80000'
}

caver.rpc.klay.getTransactionByBlockNumberAndIndex


caver.rpc.klay.getTransactionByBlockNumberAndIndex(blockNumber, index [, callback])

Returns information about a transaction by block number and transaction index position.

Parameters

Name	Type	Description
blockNumber	number \| string	The block number or the block tag string (`genesis` or `latest`).
index	number	A transaction index position inside the block.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	A transaction object, see caver.rpc.klay.getTransactionByHash for more detail.

Example


> caver.rpc.klay.getTransactionByBlockNumberAndIndex(183, 0).then(console.log)
{
    blockHash: '0xc9f643c0ebe84932c10695cbc9eb75228af09516931b58952de3e12c21a50576',
    blockNumber: '0xb7',
    from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
    gas: '0x61a8',
    gasPrice: '0x5d21dba00',
    hash: '0xdb63fb385e51fbfd84a98873c994aef622c5f1c72c5760a9ff95c55bbfd99898',
    nonce: '0x0',
    senderTxHash: '0xdb63fb385e51fbfd84a98873c994aef622c5f1c72c5760a9ff95c55bbfd99898',
    signatures: [ { V: '0x4e44', R: '0xf1a9a...', S: '0x9116c...' } ],
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    transactionIndex: '0x0',
    type: 'TxTypeValueTransfer',
    typeInt: 8,
    value: '0x8ac7230489e80000'
}

caver.rpc.klay.getTransactionByHash


caver.rpc.klay.getTransactionByHash(transactionHash [, callback])

Returns the information about a transaction requested by transaction hash.

Parameters

Name	Type	Description
transactionHash	string	A transaction hash.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object - A transaction object, or null when no transaction was found:

Name	Type	Description
blockHash	string	Hash of the block where this transaction was in.
blockNumber	string	Block number where this transaction was in.
codeFormat	string	(optional) The code format of smart contract code.
feePayer	string	(optional) Address of the fee payer.
feePayerSignatures	Array	(optional) An array of fee payer's signature objects. A signature object contains three fields (V, R, and S). V contains ECDSA recovery id. R contains ECDSA signature r while S contains ECDSA signature s.
feeRatio	string	(optional) Fee ratio of the fee payer. If it is 30, 30% of the fee will be paid by the fee payer. 70% will be paid by the sender.
from	string	Address of the sender.
gas	string	Gas provided by the sender.
gasPrice	string	Gas price provided by the sender in peb.
hash	string	Hash of the transaction.
humanReadable	Boolean	(optional) `true` if the address is humanReadable, `false` if the address is not humanReadable.
key	string	(optional) The RLP-encoded AccountKey used to update AccountKey of an kaia account. See AccountKey for more details.
input	string	(optional) The data sent along with the transaction.
nonce	string	The number of transactions made by the sender prior to this one.
senderTxHash	string	(optional) Hash of the tx without the fee payer's address and signature. This value is always the same as the value of `hash` for non-fee-delegated transactions.
signatures	Array	An array of signature objects. A signature object contains three fields (V, R, and S). V contains ECDSA recovery id. R contains ECDSA signature r while S contains ECDSA signature s.
to	string	Address of the receiver. `null` when it is a contract deploying transaction.
transactionIndex	string	Integer of the transaction index position in the block.
type	string	A string representing the type of the transaction.
typeInt	number	An integer representing the type of the transaction.
value	string	Value transferred in peb.

If the transaction is in pending status that has not yet been processed, default values for blockHash, blockNumber and transactionIndex are returned. See the example below.

Example


> caver.rpc.klay.getTransactionByHash('0x991d2e63b91104264d2886fb2ae2ccdf90551377af4e334b313abe123a5406aa').then(console.log)
{
    blockHash: '0xb273976bad5f3d40ba46839c020f61b1629e2362d351e3c9cb32268afc7cb477',
    blockNumber: '0x74c',
    codeFormat: '0x0',
    from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
    gas: '0x3d0900',
    gasPrice: '0x5d21dba00',
    hash: '0x991d2e63b91104264d2886fb2ae2ccdf90551377af4e334b313abe123a5406aa',
    humanReadable: false,
    input: '0x60806...',
    nonce: '0xa',
    senderTxHash: '0x991d2e63b91104264d2886fb2ae2ccdf90551377af4e334b313abe123a5406aa',
    signatures: [ { V: '0x4e44', R: '0xe4ac3...', S: '0x5374f...' } ],
    to: null,
    transactionIndex: '0x0',
    type: 'TxTypeSmartContractDeploy',
    typeInt: 40,
    value: '0x0',
}
// When transaction is in pending, default values for `blockHash`, `blockNumber` and `trasnactionIndex` are returned.
> caver.rpc.klay.getTransactionByHash('0x72e3838a42fbe75724a685ca03e50ff25ebc564e32d06dadf41be2190e5b11d1').then(console.log)
{
    blockHash: '0x0000000000000000000000000000000000000000000000000000000000000000',
    blockNumber: '0x0',
    from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
    gas: '0x61a8',
    gasPrice: '0x5d21dba00',
    hash: '0x72e3838a42fbe75724a685ca03e50ff25ebc564e32d06dadf41be2190e5b11d1',
    nonce: '0xd',
    senderTxHash: '0x72e3838a42fbe75724a685ca03e50ff25ebc564e32d06dadf41be2190e5b11d1',
    signatures: [ { V: '0x4e44', R: '0x73634...', S: '0x479be...' } ],
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    transactionIndex: '0x0',
    type: 'TxTypeValueTransfer',
    typeInt: 8,
    value: '0x8ac7230489e80000',
}

caver.rpc.klay.getTransactionBySenderTxHash


caver.rpc.klay.getTransactionBySenderTxHash(senderTxHash [, callback])

Returns the information about a transaction requested by the sender transaction hash.

Please note that this API returns the correct result only if the indexing feature is enabled in the node by --sendertxhashindexing. Use caver.rpc.klay.isSenderTxHashIndexingEnabled to check if the indexing feature is enabled or not.

Parameters

Name	Type	Description
senderTxHash	string	The sender transaction hash. See SenderTxHash for more detail.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	A transaction object, see caver.rpc.klay.getTransactionByHash for more details.

Example


> caver.rpc.klay.getTransactionBySenderTxHash('0x991d2e63b91104264d2886fb2ae2ccdf90551377af4e334b313abe123a5406aa').then(console.log)
{
    blockHash: '0xb273976bad5f3d40ba46839c020f61b1629e2362d351e3c9cb32268afc7cb477',
    blockNumber: '0x74c',
    codeFormat: '0x0',
    from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
    gas: '0x3d0900',
    gasPrice: '0x5d21dba00',
    hash: '0x991d2e63b91104264d2886fb2ae2ccdf90551377af4e334b313abe123a5406aa',
    humanReadable: false,
    input: '0x60806...',
    nonce: '0xa',
    senderTxHash: '0x991d2e63b91104264d2886fb2ae2ccdf90551377af4e334b313abe123a5406aa',
    signatures: [ { V: '0x4e44', R: '0xe4ac3...', S: '0x5374f...' } ],
    to: null,
    transactionIndex: '0x0',
    type: 'TxTypeSmartContractDeploy',
    typeInt: 40,
    value: '0x0',
}

caver.rpc.klay.getTransactionReceipt


caver.rpc.klay.getTransactionReceipt(transactionHash [, callback])

Returns the receipt of a transaction by transaction hash.

NOTE Receipt is not available for pending transactions whose transactions have not yet been processed.

Parameters

Name	Type	Description
transactionHash	string	A transaction hash.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object - A transaction receipt object, or null when no receipt was found:

Name	Type	Description
blockHash	string	Hash of the block where this transaction was in.
blockNumber	string	Block number where this transaction was in.
codeFormat	string	(optional) The code format of smart contract code.
contractAddress	string	The contract address created, if the transaction was a contract creation, otherwise `null`.
effectiveGasPrice	string	The actual value per gas deducted from the sender. Before the Magma hard fork, this value was equal to the transaction’s gas price. After the Magma hard fork, it is equal to the value of `baseFee` in the block header.
feePayer	string	(optional) Address of the fee payer.
feePayerSignatures	Array	(optional) An array of fee payer's signature objects. A signature object contains three fields (V, R, and S). V contains ECDSA recovery id. R contains ECDSA signature r while S contains ECDSA signature s.
feeRatio	string	(optional) Fee ratio of the fee payer. If it is 30, 30% of the fee will be paid by the fee payer. 70% will be paid by the sender.
from	string	Address of the sender.
gas	string	Gas provided by the sender.
gasPrice	string	Gas price provided by the sender in peb.
gasUsed	string	The amount of gas used by this specific transaction alone.
humanReadable	Boolean	(optional) `true` if the address is humanReadable, `false` if the address is not humanReadable.
key	string	(optional) The RLP-encoded AccountKey used to update AccountKey of a kaia account.
input	string	(optional) The data sent along with the transaction.
logs	Array	Array of log objects, which this transaction generated.
logsBloom	string	Bloom filter for light clients to quickly retrieve related logs.
nonce	string	The number of transactions made by the sender prior to this one.
senderTxHash	string	(optional) Hash of a transaction that is signed only by the sender. See SenderTxHash. This value is always the same as `transactionHash` for non-fee-delegated transactions.
signatures	Array	An array of signature objects. A signature object contains three fields (V, R, and S). V contains ECDSA recovery id. R contains ECDSA signature r while S contains ECDSA signature s.
status	string	`0x1` if the transaction was successful, `0x0` if the kaia Virtual Machine reverted the transaction.
txError	string	(optional) detailed error code if `status` is equal to `0x0`.
to	string	Address of the receiver. `null` when it is a contract creation transaction.
transactionHash	string	Hash of the transaction.
transactionIndex	string	Integer of the transaction index position in the block.
type	string	A string representing the type of the transaction.
typeInt	number	An integer representing the type of the transaction.
value	string	Value transferred in peb.

NOTE effectiveGasPrice is supported since caver-js v1.9.0.

Example


// Before the Magma hard fork
> caver.rpc.klay.getTransactionReceipt('0xdb63fb385e51fbfd84a98873c994aef622c5f1c72c5760a9ff95c55bbfd99898').then(console.log)
{
    blockHash: '0xc9f643c0ebe84932c10695cbc9eb75228af09516931b58952de3e12c21a50576',
    blockNumber: '0xb7',
    contractAddress: null,
    effectiveGasPrice: '0x5d21dba00',
    from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
    gas: '0x61a8',
    gasPrice: '0x5d21dba00',
    gasUsed: '0x5208',
    logs: [],
    logsBloom: '0x00000...',
    nonce: '0x0',
    senderTxHash: '0xdb63fb385e51fbfd84a98873c994aef622c5f1c72c5760a9ff95c55bbfd99898',
    signatures: [ { V: '0x4e44', R: '0xf1a9a...', S: '0x9116c...' } ],
    status: '0x1',
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    transactionHash: '0xdb63fb385e51fbfd84a98873c994aef622c5f1c72c5760a9ff95c55bbfd99898',
    transactionIndex: '0x0',
    type: 'TxTypeValueTransfer',
    typeInt: 8,
    value: '0x8ac7230489e80000',
}
// After the Magma hard fork
> caver.rpc.klay.getTransactionReceipt('0xf0554493c273352eac667eb30a1b70fffa8e8a0f682928b31baaceccc17c64b9').then(console.log)
{
  blockHash: '0xaa358681023db9d967ff44577a34aea487c37433ebf6ef349baee50f9d1d2f03',
  blockNumber: '0x99',
  contractAddress: null,
  effectiveGasPrice: '0x5d21dba00',
  from: '0xca7a99380131e6c76cfa622396347107aeedca2d',
  gas: '0x61a8',
  gasPrice: '0xba43b7400',
  gasUsed: '0x5208',
  logs: [],
  logsBloom: '0x00000...',
  nonce: '0x2',
  senderTxHash: '0xf0554493c273352eac667eb30a1b70fffa8e8a0f682928b31baaceccc17c64b9',
  signatures: [ { V: '0x1cb4c6', R: '0x1605e...', S: '0x459cf...' } ],
  status: '0x1',
  to: '0x08ef5d2def29ff4384dd93a73e076d959abbd2f4',
  transactionHash: '0xf0554493c273352eac667eb30a1b70fffa8e8a0f682928b31baaceccc17c64b9',
  transactionIndex: '0x0',
  type: 'TxTypeValueTransfer',
  typeInt: 8,
  value: '0xde0b6b3a7640000'
}

caver.rpc.klay.getTransactionReceiptBySenderTxHash


caver.rpc.klay.getTransactionReceiptBySenderTxHash(senderTxHash [, callback])

Returns the receipt of a transaction by sender transaction hash.

NOTE Receipt is not available for pending transactions whose transactions have not yet been processed.

Parameters

Name	Type	Description
senderTxHash	string	The sender transaction hash. See SenderTxHash for more detail.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object

Type	Description
object	A transaction receipt object, see caver.rpc.klay.getTransactionReceipt for more detail.

Example


> caver.rpc.klay.getTransactionReceiptBySenderTxHash('0xdb63fb385e51fbfd84a98873c994aef622c5f1c72c5760a9ff95c55bbfd99898').then(console.log)
{
    blockHash: '0xc9f643c0ebe84932c10695cbc9eb75228af09516931b58952de3e12c21a50576',
    blockNumber: '0xb7',
    contractAddress: null,
    effectiveGasPrice: '0x5d21dba00',
    from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
    gas: '0x61a8',
    gasPrice: '0x5d21dba00',
    gasUsed: '0x5208',
    logs: [],
    logsBloom: '0x00000...',
    nonce: '0x0',
    senderTxHash: '0xdb63fb385e51fbfd84a98873c994aef622c5f1c72c5760a9ff95c55bbfd99898',
    signatures: [ { V: '0x4e44', R: '0xf1a9a...', S: '0x9116c...' } ],
    status: '0x1',
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    transactionHash: '0xdb63fb385e51fbfd84a98873c994aef622c5f1c72c5760a9ff95c55bbfd99898',
    transactionIndex: '0x0',
    type: 'TxTypeValueTransfer',
    typeInt: 8,
    value: '0x8ac7230489e80000',
}

caver.rpc.klay.sendRawTransaction


caver.rpc.klay.sendRawTransaction(signedTransaction [, callback])

Sends a signed transaction to the kaia.

The signedTransaction parameter can be a "RLP-encoded signed transaction." You can get the RLP-encoded transaction of a signed transaction using transaction.getRLPEncoding. For convenience, caver.rpc.klay.sendRawTransaction also accepts a "signed transaction instance" as parameter.

Parameters

Name	Type	Description
signedTransaction	string \| object	A RLP-encoded signed transaction or an instance of signed transaction.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Type	Description
PromiEvent	A promise combined event emitter. It will be resolved when a transaction receipt is available.

For PromiEvent, the following events are available:

transactionHash returns string: Is fired right after a transaction is sent and a transaction hash is available.
receipt returns object: Is fired when a transaction receipt is available. See caver.rpc.klay.getTransactionReceipt for more detail.
error returns Error: Is fired if an error occurs during sending. On an out-of-gas error, the second parameter is the receipt.

Example


// Using promise
> caver.rpc.klay.sendRawTransaction('0x08f88...').then(console.log)
{
    blockHash: '0x8bff3eb5444711f53707c1c006dac54164af6f873c0f012aff98479155de3c46',
    blockNumber: '0x18a6',
    contractAddress: null,
    from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
    gas: '0x61a8',
    gasPrice: '0x5d21dba00',
    gasUsed: '0x5208',
    logs: [],
    logsBloom: '0x00000...',
    nonce: '0xc',
    senderTxHash: '0x72ea9179350cf2943e966eaf1e1e651d4e1b50ead4b6e6a574a4297c9f0f7017',
    signatures: [ { V: '0x4e43', R: '0x3bee4...', S: '0x101a1...' } ],
    status: '0x1',
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    transactionHash: '0x72ea9179350cf2943e966eaf1e1e651d4e1b50ead4b6e6a574a4297c9f0f7017',
    transactionIndex: '0x0',
    type: 'TxTypeValueTransfer',
    typeInt: 8,
    value: '0x8ac7230489e80000',
}
// Using event emitter
> caver.rpc.klay.sendRawTransaction('0x08f88...').on('transactionHash', h => {...}).on('receipt', r => {...}).on('error', console.error)

caver.rpc.klay.sendTransaction


caver.rpc.klay.sendTransaction(transaction [, callback])

Signs a transaction as a transaction sender with an "imported account's private key" in your kaia Node and propagates the transaction to the kaia.

For more information about each transaction type, refer to Transaction.

NOTE: This API provides the function to sign a transaction using an imported account in your kaia node. The imported account in your node must be unlocked to sign a transaction.

Parameters

Name	Type	Description
transaction	object	An instance of a transaction to be sent to the kaia.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Type	Description
PromiEvent	A promise combined event emitter. It will be resolved when a transaction receipt is available.

For PromiEvent, the following events are available:

transactionHash returns string: Is fired right after a transaction is sent and a transaction hash is available.
receipt returns object: Is fired when a transaction receipt is available. See caver.rpc.klay.getTransactionReceipt for more detail.
error returns Error: Is fired if an error occurs during sending. On an out-of-gas error, the second parameter is the receipt.

Example


> const tx = caver.transaction.valueTransfer.create({
    from: '0x{address in hex}', // The address of imported account in kaia Node
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    value: caver.utils.convertToPeb(10, 'KLAY'),
    gas: 25000
})
// Using promise
> caver.rpc.klay.sendTransaction(tx).then(console.log)
{
    blockHash: '0xbfce3abcad0204e363ee9e3b94d15a20c1a4b86ac6cf51dd74db2226ab5b9e99',
    blockNumber: '0x1d18',
    contractAddress: null,
    from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
    gas: '0x61a8',
    gasPrice: '0x5d21dba00',
    gasUsed: '0x5208',
    logs: [],
    logsBloom: '0x00000...',
    nonce: '0x13',
    senderTxHash: '0x2c001a776290ac55ac53a82a70a0b71e07c985fe57fd9d8e422b919d4317002e',
    signatures: [ { V: '0x4e43', R: '0xeac91...', S: '0xa0aa4...' } ],
    status: '0x1',
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    transactionHash: '0x2c001a776290ac55ac53a82a70a0b71e07c985fe57fd9d8e422b919d4317002e',
    transactionIndex: '0x0',
    type: 'TxTypeValueTransfer',
    typeInt: 8,
    value: '0x8ac7230489e80000',
}
// Using event emitter
> caver.rpc.klay.sendTransaction(tx).on('transactionHash', h => {...}).on('receipt', r => {...}).on('error', console.error)

caver.rpc.klay.sendTransactionAsFeePayer


caver.rpc.klay.sendTransactionAsFeePayer(transaction [, callback])

Signs a fee delegated transaction as a transaction fee payer with an imported account's private key in your kaia Node and propagates the transaction to the kaia.

Before using sendTransaction as a fee payer, the transaction sender must have signed with valid signature(s) and the nonce must have been defined.

For more information about each transaction type, refer to Transaction.

NOTE: This API provides the function to sign a transaction using an imported account in your kaia node. The imported account in your node must be unlocked to sign a transaction.

Parameters

Name	Type	Description
transaction	object	An instance of fee delegated transaction to send to the kaia.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Type	Description
PromiEvent	A promise combined event emitter. It will be resolved when a transaction receipt is available.

For PromiEvent, the following events are available:

transactionHash returns string: Is fired right after a transaction is sent and a transaction hash is available.
receipt returns object: Is fired when a transaction receipt is available. See caver.rpc.klay.getTransactionReceipt for more detail.
error returns Error: Is fired if an error occurs during sending. On an out-of-gas error, the second parameter is the receipt.

Example


> const tx = caver.transaction.feeDelegatedValueTransfer.create({
    from: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    value: caver.utils.toPeb(1, 'KLAY'),
    gas: 50000,
    nonce: 1,
    signatures: [
        [
            '0x4e43',
            '0x873e9db6d055596a8f79a6a2761bfb464cbc1b352ac1ce53770fc23bb16d929c',
            '0x15d206781cc8ac9ffb02c08545cb832e1f1700b46b886d72bb0cfeb4a230871e',
        ],
    ],
    feePayer: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e', // The address of imported account in kaia Node
})
// Using promise
> caver.rpc.klay.signTransaction(tx).then(console.log)
{
    blockHash: '0x3be2f5b17eb35d0cf83b493ddfaa96d44cba40d1839778b4a8267f4c0aa61449',
    blockNumber: '0x23ef',
    contractAddress: null,
    feePayer: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
    feePayerSignatures: [ { V: '0x4e43', R: '0x7a9ec...', S: '0x22be3...' } ],
    from: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    gas: '0xc350',
    gasPrice: '0x5d21dba00',
    gasUsed: '0x7918',
    logs: [],
    logsBloom: '0x00000...',
    nonce: '0x1',
    senderTxHash: '0x71ca2e169a9c6c7b5bfdfa68e584314978f2abef955f8a2666325b860e2c9df5',
    signatures: [ { V: '0x4e43', R: '0x873e9...', S: '0x15d20...' } ],
    status: '0x1',
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    transactionHash: '0x04fa82ce10168e05db04a235f025e5b8bc004ab36710798a512fab75a95bfc52',
    transactionIndex: '0x0',
    type: 'TxTypeFeeDelegatedValueTransfer',
    typeInt: 9,
    value: '0xde0b6b3a7640000',
}
// Using event emitter
> caver.rpc.klay.sendTransactionAsFeePayer(tx).on('transactionHash', h => {...}).on('receipt', r => {...}).on('error', console.error)

caver.rpc.klay.signTransaction


caver.rpc.klay.signTransaction(transaction [, callback])

Signs a transaction as a transaction sender with an "imported account's private key" in your kaia Node.

For more information about each transaction type, refer to Transaction.

NOTE: This API provides the function to sign a transaction using an imported account in your kaia node. The imported account in your node must be unlocked to sign a transaction.

Parameters

Name	Type	Description
transaction	object	An instance of a transaction to sign.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object - An object includes signed transaction:

Name	Type	Description
raw	string	A RLP-encoded signed transaction.
tx	object	The transaction object including the sender's signature.

Example


> const tx = caver.transaction.valueTransfer.create({
    from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e', // The address of imported account in kaia Node
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    value: caver.utils.toPeb(10, 'KLAY'),
    gas: 25000
})
> caver.rpc.klay.signTransaction(tx).then(console.log)
{
    raw: '0x08f88...',
    tx: {
        typeInt: 8,
        type: 'TxTypeValueTransfer',
        nonce: '0x16',
        gasPrice: '0x5d21dba00',
        gas: '0x61a8',
        to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
        value: '0x8ac7230489e80000',
        from: '0x3af68ad73f45a1e7686e8fcd23e910625ef2186e',
        signatures: [ { V: '0x4e43', R: '0x52d64...', S: '0x1371e...' } ],
        hash: '0xe816952761caccf86ab281a00e10a36da6579c425041906a235f10959b2960b1'
    }
}

caver.rpc.klay.signTransactionAsFeePayer


caver.rpc.klay.signTransactionAsFeePayer(transaction [, callback])

Signs a transaction as a transaction fee payer with an "imported account's private key" in your kaia Node.

For more information about each transaction type, refer to Transaction.

NOTE: This API provides the function to sign a transaction using an imported account in your kaia node. The imported account in your node must be unlocked to sign a transaction.

Parameters

Name	Type	Description
transaction	object	An instance of a transaction to sign.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object - An object includes signed transaction:

Name	Type	Description
raw	string	A RLP-encoded signed transaction.
tx	object	The transaction object to sign as fee payer.

Example


> const tx = caver.transaction.feeDelegatedValueTransfer.craete({
    from: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
    value: caver.utils.toPeb(1, 'KLAY'),
    gas: 50000,
    nonce: 0,
    signatures: [
        [
            '0x4e43',
            '0xe87291c7311534c3e451c6f6b8cafdf7454970f98504e9af6cfdeb29757ba458',
            '0x26dcf6f3702110230b806628165e28771e1152ea864ee4c69557faccd4d3dae8',
        ],
    ],
    feePayer: '0xe8b3a6ef12f9506e1df9fd445f9bb4488a482122', // The address of imported account in kaia Node
})
> caver.rpc.klay.signTransactionAsFeePayer(tx).then(console.log)
{
    raw: '0x09f8e...',
    tx: {
        typeInt: 9,
        type: 'TxTypeFeeDelegatedValueTransfer',
        nonce: '0x0',
        gasPrice: '0x5d21dba00',
        gas: '0xc350',
        to: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
        value: '0xde0b6b3a7640000',
        from: '0x1637a2fc3ef9a391b2d8411854167ab3912a2fcc',
        signatures: [ { V: '0x4e43', R: '0xe8729...', S: '0x26dcf...' } ],
        feePayer: '0xe8b3a6ef12f9506e1df9fd445f9bb4488a482122',
        feePayerSignatures: [ { V: '0x4e43', R: '0x5cce8...', S: '0x32907...' } ],
        hash: '0xdb89281f3a44a2370d73b389bbcfb9a597f558219145cf269a0b1480f8e778cc',
    },
}

caver.rpc.klay.getDecodedAnchoringTransactionByHash


caver.rpc.klay.getDecodedAnchoringTransactionByHash(transactionHash [, callback])

Returns the decoded anchored data in the transaction for the given transaction hash.

Parameters

Name	Type	Description
transactionHash	string	A transaction hash.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object - An object includes decoded anchored data:

Name	Type	Description
BlockHash	string	Hash of the child chain block that this anchoring transaction was performed.
BlockNumber	number	The child chain block number that this anchoring transaction was performed.
ParentHash	string	Hash of the parent block.
TxHash	string	The root of the transaction trie of the block.
StateRootHash	string	The root of the final state trie of the block.
ReceiptHash	string	The root of the receipts trie of the block.
BlockCount	number	The number of blocks generated during this anchoring period. In most cases, this number is equal to the child chain's `SC_TX_PERIOD`, except the case that this transaction was the first anchoring tx after turning on the anchoring.
TxCount	number	The number of transactions generated in the child chain during this anchoring period.

Example


> caver.rpc.klay.getDecodedAnchoringTransactionByHash('0x59831a092a9f0b48018848f5dd88a457efdbfabec13ea07cd769686741a1cd13').then(console.log)
{
    BlockCount: 86400,
    BlockHash: '0x3c44b2ed491be7264b9f6819c67427642447716576b6702a72f6fdc40c41abde',
    BlockNumber: 23414400,
    ParentHash: '0x735468bb091a296c45553c8f67a8d0d39ac428cbe692b1b6c494d336351477f3',
    ReceiptHash: '0x6a908d319b6f6ab4414da1afd6763d70ecc8037ec167aa8a942bc0c2af12b4ab',
    StateRootHash: '0x4a664227fb2508a2952a4695cabb88b433522af2a5dee50cc6dd4036d85bf1d3',
    TxCount: 50895,
    TxHash: '0x753a85d2c53fc34cb9108301f1cf8ff8d78dde13d42d80958e47e388008319cd',
}

caver.rpc.klay.getChainId


caver.rpc.klay.getChainId([callback])

Returns the chain ID of the chain.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The chain ID of the chain.

Example


> caver.rpc.klay.getChainId().then(console.log)
0x2710

caver.rpc.klay.getClientVersion


caver.rpc.klay.getClientVersion([callback])

Returns the current client version of a kaia node.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The current client version of a kaia node.

Example


> caver.rpc.klay.getClientVersion().then(console.log)
kaia/v1.3.0+144494d2aa/linux-amd64/go1.13.1

caver.rpc.klay.getGasPrice


caver.rpc.klay.getGasPrice([callback])

Returns the current price per gas in peb.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The current gas price in peb.

Example


> caver.rpc.klay.getGasPrice().then(console.log)
0x5d21dba00

caver.rpc.klay.getGasPriceAt


caver.rpc.klay.getGasPriceAt([blockNumber] [, callback])

Returns the current price per gas in peb for the given block.

Parameters

Name	Type	Description
blockNumber	number	(optional) The block number. If omitted, the latest unit price will be returned.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The current gas price in peb.

Example


> caver.rpc.klay.getGasPriceAt().then(console.log)
0x5d21dba00

caver.rpc.klay.getMaxPriorityFeePerGas


caver.rpc.klay.getMaxPriorityFeePerGas([callback])

Returns a suggested gas tip cap for dynamic fee transactions in peb. Since kaia has a fixed gas price, this returns the gas price set by kaia.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The suggested gas tip cap in peb.

Example


> caver.rpc.klay.getMaxPriorityFeePerGas().then(console.log)
0x5d21dba00

caver.rpc.klay.getLowerBoundGasPrice


caver.rpc.klay.getLowerBoundGasPrice([callback])

Returns the lower bound gas price in peb.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The lower bound gas price in peb.

Example


> caver.rpc.klay.getLowerBoundGasPrice().then(console.log)
0x5d21dba00

caver.rpc.klay.getUpperBoundGasPrice


caver.rpc.klay.getUpperBoundGasPrice([callback])

Returns the upper bound gas price in peb.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The upper bound gas price in peb.

Example


> caver.rpc.klay.getUpperBoundGasPrice().then(console.log)
0xae9f7bcc00

caver.rpc.klay.getFeeHistory


caver.rpc.klay.getFeeHistory(blockCount, lastBlock, rewardPercentiles [, callback])

Returns fee history for the returned block range. This can be a subsection of the requested range if not all blocks are available.

Parameters

Name	Type	Description
blockCount	number\|BigNumber\|BN\|string	Number of blocks in the requested range. Between 1 and 1024 blocks can be requested in a single query. Less than requested may be returned if not all blocks are available.
lastBlock	number\|BigNumber\|BN\|string	Highest number block (or block tag string) of the requested range.
rewardPercentiles	Array	A monotonically increasing list of percentile values to sample from each block’s effective priority fees per gas in ascending order, weighted by gas used. (Example: `['0', '25', '50', '75', '100']` or `['0', '0.5', '1', '1.5', '3', '80']`)
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object - An object includes fee history:

Name	Type	Description
oldestBlock	string	Lowest number block of returned range.
reward	Array	A two-dimensional array of effective priority fees per gas at the requested block percentiles.
baseFeePerGas	Array	An array of block base fees per gas. This includes the next block after the newest of the returned range, because this value can be derived from the newest block. Zeroes are returned for pre-EIP-1559 blocks.
gasUsedRatio	Array	An array of gasUsed/gasLimit in the block.

Example


> caver.rpc.klay.getFeeHistory(3, 'latest', [0.1, 0.2, 0.3]).then(console.log)
{
  oldestBlock: '0xbb701',
  reward: [
    [ '0x0', '0x0', '0x0' ],
    [ '0x5d21dba00', '0x5d21dba00', '0x5d21dba00' ],
    [ '0x0', '0x0', '0x0' ]
  ],
  baseFeePerGas: [ '0x0', '0x0', '0x0', '0x0' ],
  gasUsedRatio: [ 0, 2.1000000000021e-8, 0 ]
}

caver.rpc.klay.createAccessList


caver.rpc.klay.createAccessList(txCallObject [, callback])

This method creates an accessList based on a given Transaction. The accessList contains all storage slots and addresses read and written by the transaction, except for the sender account and the precompiles. This method uses the same transaction call object and blockNumberOrTag object as caver.rpc.klay.call. An accessList can be used to release stuck contracts that became inaccessible due to gas cost increases. Adding an accessList to your transaction does not necessary result in lower gas usage compared to a transaction without an access list.

Parameters

Name	Type	Description
callObject	object	A transaction call object. Please see caver.rpc.klay.call parameters.
blockParameter	number\|BigNumber\|BN\|string	(optional) A block number, blockhash or the block tag string (`latest` or `earliest`). If omitted, `latest` will be used.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns object - An object includes an access list:

Name	Type	Description
oldestBlock	string	Lowest number block of returned range.
reward	Array	A two-dimensional array of effective priority fees per gas at the requested block percentiles.
baseFeePerGas	Array	An array of block base fees per gas. This includes the next block after the newest of the returned range, because this value can be derived from the newest block. Zeroes are returned for pre-EIP-1559 blocks.
gasUsedRatio	Array	An array of gasUsed/gasLimit in the block.

Example


> caver.rpc.klay.createAccessList({
        from: '0x3bc5885c2941c5cda454bdb4a8c88aa7f248e312',
        data: '0x20965255',
        gasPrice: '0x3b9aca00',
        gas: '0x3d0900',
        to: '0x00f5f5f3a25f142fafd0af24a754fafa340f32c7'
    }, 'latest').then(console.log)
{ accessList: [], gasUsed: '0x0' }

caver.rpc.klay.isParallelDBWrite


caver.rpc.klay.isParallelDBWrite([callback])

Returns true if the node is writing blockchain data in a parallel manner.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns boolean

Type	Description
boolean	`true` means the node is writing blockchain data in a parallel manner. It is `false` if the node is serially writing the data.

Example


> caver.rpc.klay.isParallelDBWrite().then(console.log)
true

caver.rpc.klay.isSenderTxHashIndexingEnabled


caver.rpc.klay.isSenderTxHashIndexingEnabled([callback])

Returns true if the node is indexing sender transaction hash to transaction hash mapping information.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns boolean

Type	Description
boolean	`true` means the node is indexing sender transaction hash to transaction hash mapping information.

Example


> caver.rpc.klay.isSenderTxHashIndexingEnabled().then(console.log)
true

caver.rpc.klay.getProtocolVersion


caver.rpc.klay.getProtocolVersion([callback])

Returns the kaia protocol version of the node. The current version (as of v1.9.0) of Cypress/Baobab is istanbul/65.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The kaia protocol version of the node.

Example


> caver.rpc.klay.getProtocolVersion().then(console.log)
0x40

caver.rpc.klay.getRewardbase


caver.rpc.klay.getRewardbase([callback])

Returns the rewardbase of the current node. Rewardbase is the address of the account where the block rewards go to. It is only required for CNs.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The rewardbase address.

Example


> caver.rpc.klay.getRewardbase().then(console.log)
0xa9b3a93b2a9fa3fdcc31addd240b04bf8db3414c

caver.rpc.klay.getFilterChanges


caver.rpc.klay.getFilterChanges(filterId [, callback])

Polling method for a filter, which returns an array of logs since the last poll.

Parameters

Name	Type	Description
filterId	String	The filter id.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns Array - Array of log objects, or an empty array if nothing has changed since the last poll.

For filters created with caver.rpc.klay.newBlockFilter, the returns are block hashes, e.g., ["0x3454645634534..."].
For filters created with caver.rpc.klay.newPendingTransactionFilter, the returns are transaction hashes, e.g., ["0x6345343454645..."].
For filters created with caver.rpc.klay.newFilter, logs are objects with the following parameters:

Name	Type	Description
logIndex	string	The log index position in the block.
transactionIndex	string	The index position of transactions where this log was created from.
transactionHash	string	Hash of the transactions this log was created from. `null` when pending.
blockHash	string	Hash of the block where this log was in. `null` when pending.
blockNumber	string	The block number where this log was in. `null` when pending.
address	string	Address from which this log originated.
data	string	Contains the non-indexed arguments of the log.
topics	Array	Array of 0 to 4 32-byte DATA of indexed log arguments. (In Solidity: The first topic is the hash of the signature of the event (e.g., `Deposit(address,bytes32,uint256)`), except you declared the event with the `anonymous` specifier.).

Example


> caver.rpc.klay.getFilterChanges('0xafb8e49bbcba9d61a3c616a3a312533e').then(console.log)
[ 
    { 
        address: '0x71e503935b7816757AA0314d4E7354dab9D39162',
        topics: [ '0xe8451a9161f9159bc887328b634789768bd596360ef07c5a5cbfb927c44051f9' ],
        data: '0x0000000000000000000000000000000000000000000000000000000000000001',
        blockNumber: '0xdc5',
        transactionHash: '0x1b28e2c723e45a0d8978890598903f36a74397c9cea8531dc9762c39483e417f',
        transactionIndex: '0x0',
        blockHash: '0xb7f0bdaba93d3baaa01a5c24517da443207f774e0202f02c298e8e997a540b3d',
        logIndex: '0x0'
    } 
]

caver.rpc.klay.getFilterLogs


caver.rpc.klay.getFilterLogs(filterId [, callback])

Returns an array of all logs matching the filter with the given id. The filter object should be obtained by using newFilter.

Note that filter ids returned by other filter creation functions, such as caver.rpc.klay.newBlockFilter or caver.rpc.klay.newPendingTransactionFilter, cannot be used with this function.

Parameters

Name	Type	Description
filterId	string	The filter id.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

See caver.rpc.klay.getFilterChanges

Example


> caver.rpc.klay.getFilterLogs('0xcac08a7fc32fc625a519644187e9f690').then(console.log);
[
    {
        address: '0x55384B52a9E5091B6012717197887dd3B5779Df3',
        topics: [ '0xe8451a9161f9159bc887328b634789768bd596360ef07c5a5cbfb927c44051f9' ],
        data: '0x0000000000000000000000000000000000000000000000000000000000000001',
        blockNumber: '0x1c31',
        transactionHash: '0xa7436c54e47dafbce696de65f6e890c96ac22c236f50ca1be28b9b568034c3b3',
        transactionIndex: '0x0',
        blockHash: '0xe4f27c524dacfaaccb36735deccee69b3d6c315e969779784c36bb8e14b89e01',
        logIndex: '0x0'
    }
]

caver.rpc.klay.getLogs


caver.rpc.klay.getLogs(options [, callback])

Returns an array of all logs matching a given filter object.

Parameters

Name	Type	Description
options	object	The filter options. See the below table to find the description.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

The options object can contain the following:

Name	Type	Description
fromBlock	number \| string	(optional) The block number of the earliest block to get the logs. (`"latest"` means the most recent block.) The default value is `"latest"`.
toBlock	number \| string	(optional) The block number of the last block to get the logs. (`"latest"` means the most recent block.). The default value is `"latest"`.
address	string \| Array	(optional) An address or a list of addresses. Only the logs related to the particular account(s) will be returned.
topics	Array	(optional) An array of values that must appear in the log entries. The order is important. If you want to leave topics out, use `null`, e.g., `[null, '0x12...']`. You can also pass an array for each topic with options for that topic, e.g., `[null, ['option1', 'option2']]`.

Return Value

See caver.rpc.klay.getFilterChanges

Example


> caver.rpc.klay.getLogs({
        fromBlock: '0x1',
        toBlock: 'latest',
        address:'0x87ac99835e67168d4f9a40580f8f5c33550ba88b'
    }).then(console.log)
[
    {
        data: '0x7f9fade1c0d57a7af66ab4ead79fade1c0d57a7af66ab4ead7c2c2eb7b11a91385',
        topics: [
            '0xfd43ade1c09fade1c0d57a7af66ab4ead7c2c2eb7b11a91ffdd57a7af66ab4ead7', '0x7f9fade1c0d57a7af66ab4ead79fade1c0d57a7af66ab4ead7c2c2eb7b11a91385
        ]
        logIndex: '0x0',
        transactionIndex: '0x0',
        transactionHash: '0x7f9fade1c0d57a7af66ab4ead79fade1c0d57a7af66ab4ead7c2c2eb7b11a91385',
        blockHash: '0xfd43ade1c09fade1c0d57a7af66ab4ead7c2c2eb7b11a91ffdd57a7af66ab4ead7',
        blockNumber: '0x4d2',
        address: '0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe'
    },
    {...}
]

caver.rpc.klay.newBlockFilter


caver.rpc.klay.newBlockFilter([callback])

Creates a filter in the node, to notify when a new block arrives. To check if the state has changed, call caver.rpc.klay.getFilterChanges.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	A filter id.

Example


> caver.rpc.klay.newBlockFilter().then(console.log)
0xf90906914486a9c22d620e50022b38d5

caver.rpc.klay.newFilter


caver.rpc.klay.newFilter(options [, callback])

Creates a filter object using the given filter options, to receive the specific state changes (logs).

To check if the state has changed, call caver.rpc.klay.getFilterChanges.
To obtain all logs matching the filter created by newFilter, call caver.rpc.klay.getFilterLogs.

For detailed information about the topics in the filter object, please see Kaia Platform API - klay_newFilter.

Parameters

Name	Type	Description
options	object	The filter options. See the below table to find the description.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

The options object can contain the following:

Name	Type	Description
fromBlock	number \| string	(optional) The block number of the earliest block to get the logs. (`"latest"` means the most recent block.) The default value is `"latest"`.
toBlock	number \| string	(optional) The block number of the last block to get the logs. (`"latest"` means the most recent block.). The default value is `"latest"`.
address	string \| Array	(optional) An address or a list of addresses. Only the logs related to the particular account(s) will be returned.
topics	Array	(optional) An array of values that must appear in the log entries. The order is important. If you want to leave topics out, use `null`, e.g., `[null, '0x12...']`. You can also pass an array for each topic with options for that topic, e.g., `[null, ['option1', 'option2']]`.

Return Value

Promise returns string

Type	Description
string	A filter id.

Example


> caver.rpc.klay.newFilter({}).then(console.log)
0x40d40cb9758c6f0d99d9c2ce9c0f823
> caver.rpc.klay.newFilter({ address: '0x55384B52a9E5091B6012717197887dd3B5779Df3' }).then(console.log)
0xd165cbf31b9d60346aada33dbefe01b

caver.rpc.klay.newPendingTransactionFilter


caver.rpc.klay.newPendingTransactionFilter([callback])

Creates a filter in the node, to receive the information about new pending transaction arrival. To check if the state has changed, call caver.rpc.klay.getFilterChanges.

Parameters

Name	Type	Description
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	A filter id.

Example


> caver.rpc.klay.newPendingTransactionFilter().then(console.log)
0xe62da1b2a09efcd4168398bdbf586db0

caver.rpc.klay.uninstallFilter


caver.rpc.klay.uninstallFilter(filterId [, callback])

Uninstalls a filter with a given id. Should always be called when a watch is no longer needed. Additionally, filters time out when they are not being called with caver.rpc.klay.getFilterChanges for a period of time.

Parameters

Name	Type	Description
filterId	string	The filter id.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns boolean

Type	Description
boolean	`true` if the filter was successfully uninstalled, otherwise `false`.

Example


> caver.rpc.klay.uninstallFilter('0x1426438ffdae5abf43edf4159c5b013b').then(console.log)
true

caver.rpc.klay.sha3


caver.rpc.klay.sha3(data[, callback])

Returns Keccak-256 (not the standardized SHA3-256) of the given data. You can use caver.utils.sha3 instead of this.

Parameters

Name	Type	Description
data	String	The data to be converted into a SHA3 hash.
callback	function	(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns string

Type	Description
string	The SHA3 result of the given data.

Example


> caver.rpc.klay.sha3('0x11223344').then(console.log)
0x36712aa4d0dd2f64a9ae6ac09555133a157c74ddf7c079a70c33e8b4bf70dd73

caver.rpc.klay.accountCreated ​

caver.rpc.klay.getAccount ​

caver.rpc.klay.getAccountKey ​

caver.rpc.klay.encodeAccountKey ​

caver.rpc.klay.decodeAccountKey ​

caver.rpc.klay.getBalance ​

caver.rpc.klay.getCode ​

caver.rpc.klay.getTransactionCount ​

caver.rpc.klay.isContractAccount ​

caver.rpc.klay.sign ​

caver.rpc.klay.getAccounts ​

caver.rpc.klay.getBlockNumber ​

caver.rpc.klay.getHeader ​

caver.rpc.klay.getHeaderByNumber ​

caver.rpc.klay.getHeaderByHash ​

caver.rpc.klay.getBlock ​

caver.rpc.klay.getBlockByNumber ​

caver.rpc.klay.getBlockByHash ​

caver.rpc.klay.getBlockReceipts ​

caver.rpc.klay.getBlockTransactionCountByNumber ​

caver.rpc.klay.getBlockTransactionCountByHash ​

caver.rpc.klay.getBlockWithConsensusInfoByNumber ​

caver.rpc.klay.getBlockWithConsensusInfoByHash ​

caver.rpc.klay.getCommittee ​

caver.rpc.klay.getCommitteeSize ​

caver.rpc.klay.getCouncil ​

caver.rpc.klay.getCouncilSize ​

caver.rpc.klay.getStorageAt ​

caver.rpc.klay.isMinting ​

caver.rpc.klay.isSyncing ​

caver.rpc.klay.call ​

caver.rpc.klay.estimateGas ​

caver.rpc.klay.estimateComputationCost ​

caver.rpc.klay.getTransactionByBlockHashAndIndex ​

caver.rpc.klay.getTransactionByBlockNumberAndIndex ​

caver.rpc.klay.getTransactionByHash ​

caver.rpc.klay.getTransactionBySenderTxHash ​

caver.rpc.klay.getTransactionReceipt ​

caver.rpc.klay.getTransactionReceiptBySenderTxHash ​

caver.rpc.klay.sendRawTransaction ​

caver.rpc.klay.sendTransaction ​

caver.rpc.klay.sendTransactionAsFeePayer ​

caver.rpc.klay.signTransaction ​

caver.rpc.klay.signTransactionAsFeePayer ​

caver.rpc.klay.getDecodedAnchoringTransactionByHash ​

caver.rpc.klay.getChainId ​

caver.rpc.klay.getClientVersion ​

caver.rpc.klay.getGasPrice ​

caver.rpc.klay.getGasPriceAt ​

caver.rpc.klay.getMaxPriorityFeePerGas ​

caver.rpc.klay.getLowerBoundGasPrice ​

caver.rpc.klay.getUpperBoundGasPrice ​

caver.rpc.klay.getFeeHistory ​

caver.rpc.klay.createAccessList ​

caver.rpc.klay.isParallelDBWrite ​

caver.rpc.klay.isSenderTxHashIndexingEnabled ​

caver.rpc.klay.getProtocolVersion ​

caver.rpc.klay.getRewardbase ​

caver.rpc.klay.getFilterChanges ​

caver.rpc.klay.getFilterLogs ​

caver.rpc.klay.getLogs ​

caver.rpc.klay.newBlockFilter ​

caver.rpc.klay.newFilter ​

caver.rpc.klay.newPendingTransactionFilter ​

caver.rpc.klay.uninstallFilter ​

caver.rpc.klay.sha3 ​

caver.rpc.klay.accountCreated

caver.rpc.klay.getAccount

caver.rpc.klay.getAccountKey

caver.rpc.klay.encodeAccountKey

caver.rpc.klay.decodeAccountKey

caver.rpc.klay.getBalance

caver.rpc.klay.getCode

caver.rpc.klay.getTransactionCount

caver.rpc.klay.isContractAccount

caver.rpc.klay.sign

caver.rpc.klay.getAccounts

caver.rpc.klay.getBlockNumber

caver.rpc.klay.getHeader

caver.rpc.klay.getHeaderByNumber

caver.rpc.klay.getHeaderByHash

caver.rpc.klay.getBlock

caver.rpc.klay.getBlockByNumber

caver.rpc.klay.getBlockByHash

caver.rpc.klay.getBlockReceipts

caver.rpc.klay.getBlockTransactionCountByNumber

caver.rpc.klay.getBlockTransactionCountByHash

caver.rpc.klay.getBlockWithConsensusInfoByNumber

caver.rpc.klay.getBlockWithConsensusInfoByHash

caver.rpc.klay.getCommittee

caver.rpc.klay.getCommitteeSize

caver.rpc.klay.getCouncil

caver.rpc.klay.getCouncilSize

caver.rpc.klay.getStorageAt

caver.rpc.klay.isMinting

caver.rpc.klay.isSyncing

caver.rpc.klay.call

caver.rpc.klay.estimateGas

caver.rpc.klay.estimateComputationCost

caver.rpc.klay.getTransactionByBlockHashAndIndex

caver.rpc.klay.getTransactionByBlockNumberAndIndex

caver.rpc.klay.getTransactionByHash

caver.rpc.klay.getTransactionBySenderTxHash

caver.rpc.klay.getTransactionReceipt

caver.rpc.klay.getTransactionReceiptBySenderTxHash

caver.rpc.klay.sendRawTransaction

caver.rpc.klay.sendTransaction

caver.rpc.klay.sendTransactionAsFeePayer

caver.rpc.klay.signTransaction

caver.rpc.klay.signTransactionAsFeePayer

caver.rpc.klay.getDecodedAnchoringTransactionByHash

caver.rpc.klay.getChainId

caver.rpc.klay.getClientVersion

caver.rpc.klay.getGasPrice

caver.rpc.klay.getGasPriceAt

caver.rpc.klay.getMaxPriorityFeePerGas

caver.rpc.klay.getLowerBoundGasPrice

caver.rpc.klay.getUpperBoundGasPrice

caver.rpc.klay.getFeeHistory

caver.rpc.klay.createAccessList

caver.rpc.klay.isParallelDBWrite

caver.rpc.klay.isSenderTxHashIndexingEnabled

caver.rpc.klay.getProtocolVersion

caver.rpc.klay.getRewardbase

caver.rpc.klay.getFilterChanges

caver.rpc.klay.getFilterLogs

caver.rpc.klay.getLogs

caver.rpc.klay.newBlockFilter

caver.rpc.klay.newFilter

caver.rpc.klay.newPendingTransactionFilter

caver.rpc.klay.uninstallFilter

caver.rpc.klay.sha3