signTransaction

Signs a transaction.

Usage

example.ts

import { account, walletClient } from './config'
 
const request = await walletClient.prepareTransactionRequest({
  account,
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: 1000000000000000000n
})
 
const signature = await walletClient.signTransaction(request) 
// 0x02f850018203118080825208808080c080a04012522854168b27e5dc3d5839bab5e6b39e1a0ffd343901ce1622e3d64b48f1a04e00902ae0502c4728cbf12156290df99c3ed7de85b1dbfe20b5c36931733a33
 
const hash = await walletClient.sendRawTransaction(signature)

Account Hoisting

If you do not wish to pass an account to every prepareTransactionRequest, you can also hoist the Account on the Wallet Client (see config.ts).

Learn more.

example.ts

import { walletClient } from './config'
 
const request = await walletClient.prepareTransactionRequest({
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: 1000000000000000000n
})
 
const signature = await walletClient.signTransaction(request) 
// 0x02f850018203118080825208808080c080a04012522854168b27e5dc3d5839bab5e6b39e1a0ffd343901ce1622e3d64b48f1a04e00902ae0502c4728cbf12156290df99c3ed7de85b1dbfe20b5c36931733a33
 
const hash = await walletClient.sendRawTransaction(signature)

Returns

Hex

The signed serialized transaction.

Parameters

account

Type: Account | Address

The Account to send the transaction from.

Accepts a JSON-RPC Account or Local Account (Private Key, etc).

const signature = await walletClient.signTransaction({
  account: '0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266', 
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: 1000000000000000000n
})

to

Type: 0x${string}

The transaction recipient or contract address.

const signature = await walletClient.signTransaction({
  account,
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8', 
  value: 1000000000000000000n,
  nonce: 69
})

accessList (optional)

Type: AccessList

The access list.

import 'viem/window'
 
// ---cut---
import { createWalletClient, custom } from 'viem'
import { mainnet } from 'viem/chains'
 
export const walletClient = createWalletClient({
  chain: mainnet,
  transport: custom(window.ethereum!),
})
// ---cut---
const signature = await publicClient.signTransaction({
  accessList: [ 
    {
      address: '0x1',
      storageKeys: ['0x1'],
    },
  ],
  account,
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
})## Errors were thrown in the sample, but not included in an error tag

These errors were not marked as being expected: 2304 18004. 
Expected: // @errors: 2304 18004

Compiler Errors:

index.ts
  [2304] 270 - Cannot find name 'publicClient'.
  [18004] 406 - No value exists in scope for the shorthand property 'account'. Either declare one or provide an initializer.

chain (optional)

Type: Chain
Default: walletClient.chain

The target chain. If there is a mismatch between the wallet's current chain & the target chain, an error will be thrown.

The chain is also used to infer its request type (e.g. the Celo chain has a gatewayFee that you can pass through to signTransaction).

import { optimism } from 'viem/chains'
 
const signature = await walletClient.signTransaction({
  chain: optimism, 
  account,
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: 1000000000000000000n
})

data (optional)

Type: 0x${string}

A contract hashed method call with encoded args.

const signature = await walletClient.signTransaction({
  data: '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2', 
  account,
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: 1000000000000000000n
})

gasPrice (optional)

Type: bigint

The price (in wei) to pay per gas. Only applies to Legacy Transactions.

const signature = await walletClient.signTransaction({
  account,
  gasPrice: parseGwei('20'), 
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1') 
})

maxFeePerGas (optional)

Type: bigint

Total fee per gas (in wei), inclusive of maxPriorityFeePerGas. Only applies to EIP-1559 Transactions

const signature = await walletClient.signTransaction({
  account,
  maxFeePerGas: parseGwei('20'),  
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1')
})

maxPriorityFeePerGas (optional)

Type: bigint

Max priority fee per gas (in wei). Only applies to EIP-1559 Transactions

const signature = await walletClient.signTransaction({
  account,
  maxFeePerGas: parseGwei('20'),
  maxPriorityFeePerGas: parseGwei('2'), 
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1')
})

nonce (optional)

Type: number

Unique number identifying this transaction.

const signature = await walletClient.signTransaction({
  account,
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: 1000000000000000000n,
  nonce: 69
})

value (optional)

Type: bigint

Value in wei sent with this transaction.

const signature = await walletClient.signTransaction({
  account,
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: parseEther('1'), 
  nonce: 69
})