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Smart Contract Deploy

TxTypeSmartContractDeploy deploys a smart contract to the given address. The following changes will be made by this transaction type.

Fee Delegation

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

Set up sender and fee payer wallets using createWalletClient, configured with the Kairos chain, an HTTP transport, and the sender’s private key converted to an account.

Create a transaction request for a value transfer using prepareTransactionRequest, specifying the sender’s account, recipient address, value to transfer (0 KLAY in this example), transaction type (TxType.FeeDelegatedSmartContractDeploy), humanReadable: false specifies that the contract code is in bytecode (not human-readable source code), codeFormat: 0 indicates the format of the contract code (typically EVM bytecode), and data contains the compiled bytecode of the smart contract to be deployed.

Signing the transaction with the wallet client’s signTransaction method, and log the transaction hash.

The fee payer signs the already-signed transaction from the sender with function signTransactionAsFeePayer, agreeing to pay the transaction fees.

Sends the fully signed, fee-delegated transaction (signed by both sender and fee payer) to the Kairos blockchain network using the kaia_sendRawTransaction method, returning the transaction hash or response from the network.

TxTypeFeeDelegatedSmartContractDeploy.js


import { http, createWalletClient, kairos, TxType, privateKeyToAccount } from "@kaiachain/viem-ext";
const senderWallet = createWalletClient({
  chain: kairos,
  transport: http(),
  account: privateKeyToAccount(
    "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8"
  ),
})
const feePayerWallet = createWalletClient({
  chain: kairos,
  transport: http(),
  account: privateKeyToAccount(
    "0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4"
  ),
});
// Example usage
(async () => {
  const tx = await senderWallet.prepareTransactionRequest({
    type: TxType.FeeDelegatedSmartContractDeploy,
    account: senderWallet.account,
    value: 0,
    humanReadable: false,
    codeFormat: 0,
    data: '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',
  });
  const signedTx = await senderWallet.signTransaction(tx);
  console.log('signedTx', signedTx)
  const feePayerSignedTx = await feePayerWallet.signTransactionAsFeePayer(
    signedTx
  );
  const sentFeePayerTx = await feePayerWallet.request({
    method: "klay_sendRawTransaction",
    params: [feePayerSignedTx],
  });
  console.log("fee payer contract deploy tx", sentFeePayerTx);
})();

output


❯ js TxTypeFeeDelegatedSmartContractDeploy.js
signedTx 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
fee payer contract deploy tx 0x8c07cbd99de8a0ff2b84bfb9c1a7e6729e93d03b86be7db091d7981e352f779f