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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 Klaytn 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 Klaytn.
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 Klaytn. For more details about the types of an account in Klaytn, please refer to Klaytn 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 Klaytn account matching the given address does not exist in the network, null is returned.
Parameters
Name
Type
Description
address
string
The address of Klaytn 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 Klaytn.
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 Klaytn. Refer to Klaytn 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 Klaytn node. The imported account in your node must be unlocked to sign the message. To sign a transaction with imported account in your Klaytn 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 Klaytn 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 Klaytn 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