Value Transfer

TxTypeValueTransfer is used when a user wants to send KAIA.

As kaia provides multiple transaction types to make each transaction type serve a single purpose, TxTypeValueTransfer is limited to send KAIA to an externally owned account (EOA).

Import the web3 and @kaiachain/web3js-ext packages to add kaia features on web3

Define sender, fee payer addresses and private keys

Set up the provider with the specified kairos testnet URL. A provider in web3 is a read-only abstraction to access the blockchain data.

Also, you can change the provider URL from kairos to quicknode

Create a sender's wallet with the private key using web3.eth.accounts.privateKeyToAccount

Create a fee payer's wallet with the private key using web3.eth.accounts.privateKeyToAccount

Define the transaction object.

Set type: TxType.FeeDelegatedValueTransfer for transaction to send a value transfer with a fee payer

Set value: toPeb("0.01") to define the value to be transfered, use toPeb to convert Klay to Peb

Set others params like from, to

Sign the transaction with sender account using signTransaction

Sign the transaction with fee payer account using signTransactionAsFeePayer

Send the transaction to blockchain. It will return the transaction receipt

TxTypeFeeDelegatedValueTransfer.js


const { Web3, TxType, toPeb } = require("@kaiachain/web3js-ext");
const senderAddr = "0xa2a8854b1802d8cd5de631e690817c253d6a9153";
const senderPriv = "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8";
const feePayerPriv = "0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4";
const recieverAddr = "0xc40b6909eb7085590e1c26cb3becc25368e249e9";
const provider = new Web3.providers.HttpProvider("https://public-en-kairos.node.kaia.io");
const web3 = new Web3(provider);
const senderAccount = web3.eth.accounts.privateKeyToAccount(senderPriv);
const feePayerAccount = web3.eth.accounts.privateKeyToAccount(feePayerPriv);
async function main() {
  const tx = {
    type: TxType.FeeDelegatedValueTransfer,
    from: senderAddr,
    to: recieverAddr,
    value: toPeb("0.01"),
  };
  // Sign transaction by sender
  const signResult1 = await senderAccount.signTransaction(tx);
  console.log("senderTxHashRLP", signResult1.rawTransaction);
  // Sign and send transaction by fee payer
  const signResult2 = await feePayerAccount.signTransactionAsFeePayer(signResult1.rawTransaction);
  console.log("signedTx", signResult2.transactionHash);
  const receipt = await web3.eth.sendSignedTransaction(signResult2.rawTransaction);
  console.log("receipt", receipt);
}
main();

output


❯ node TxTypeFeeDelegatedValueTransfer.js
senderTxHashRLP 0x09f8878203b6850ba43b740082cd1494c40b6909eb7085590e1c26cb3becc25368e249e9872386f26fc1000094a2a8854b1802d8cd5de631e690817c253d6a9153f847f8458207f5a0119485c48b7587a7ba6358f759c0a31e7de94fea77ba28089e20135156af7d94a07c497057653e76b9646bf5cc2024aa6d58cba23d4b2fec932e61e288cb2513f9
signedTx 0xded94a15a62b6d24ac4d0a317f0ed37873d4105b0ff7500e577f6d282fdc4bae
receipt {
  blockHash: '0x442774c57650ef18338bea13ad069428acf8a6c8da5e7eb104dd1d961972400a',
  blockNumber: 148744776n,
  cumulativeGasUsed: 177286n,
  effectiveGasPrice: 25000000000n,
  from: '0xa2a8854b1802d8cd5de631e690817c253d6a9153',
  gasUsed: 31000n,
  logs: [],
  logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
  status: 1n,
  to: '0xc40b6909eb7085590e1c26cb3becc25368e249e9',
  transactionHash: '0xded94a15a62b6d24ac4d0a317f0ed37873d4105b0ff7500e577f6d282fdc4bae',
  transactionIndex: 1n,
  type: 0n
}