> For the complete documentation index, see [llms.txt](/llms.txt).

# Send a gasless transaction

[MetaMask Smart Accounts](/smart-accounts-kit/development/concepts/smart-accounts/) support gas sponsorship, which simplifies onboarding by abstracting gas fees away from end users. You can use any [paymaster](/smart-accounts-kit/development/reference/glossary#paymaster)**Paymaster** A service that pays for user operations on behalf of a smart account. service provider, such as [Pimlico](https://docs.pimlico.io/references/paymaster) or [ZeroDev](https://docs.zerodev.app/meta-infra/rpcs), or plug in your own custom paymaster.

## Prerequisites[​](#prerequisites "Direct link to Prerequisites")

- [Install and set up the Smart Accounts Kit.](/smart-accounts-kit/development/get-started/install/)
- [Create a MetaMask smart account.](/smart-accounts-kit/development/guides/smart-accounts/create-smart-account/)

## Send a gasless transaction[​](#send-a-gasless-transaction-1 "Direct link to Send a gasless transaction")

The following example demonstrates how to use Viem's [Paymaster Client](https://viem.sh/account-abstraction/clients/paymaster) to send gasless transactions. You can provide the paymaster client using the paymaster property in the [sendUserOperation](https://viem.sh/account-abstraction/actions/bundler/sendUserOperation#paymaster-optional) method, or in the [Bundler Client](https://viem.sh/account-abstraction/clients/bundler#paymaster-optional).

In this example, the paymaster client is passed to the `sendUserOperation` method.

- example.ts
- config.ts

```
import { bundlerClient, smartAccount, paymasterClient } from './config.ts'
import { parseEther } from 'viem'

// Appropriate fee per gas must be determined for the specific bundler being used.
const maxFeePerGas = 1n
const maxPriorityFeePerGas = 1n

const userOperationHash = await bundlerClient.sendUserOperation({
  account: smartAccount,
  calls: [
    {
      to: '0x1234567890123456789012345678901234567890',
      value: parseEther('0.001'),
    },
  ],
  maxFeePerGas,
  maxPriorityFeePerGas,
  paymaster: paymasterClient,
})

```

```
import { createPublicClient, createPaymasterClient, http } from 'viem'
import { createBundlerClient } from 'viem/account-abstraction'
import { sepolia as chain } from 'viem/chains'
import { generatePrivateKey, privateKeyToAccount } from 'viem/accounts'
import { Implementation, toMetaMaskSmartAccount } from '@metamask/smart-accounts-kit'

const publicClient = createPublicClient({
  chain,
  transport: http(),
})

const privateKey = generatePrivateKey()
const account = privateKeyToAccount(privateKey)

export const smartAccount = await toMetaMaskSmartAccount({
  client: publicClient,
  implementation: Implementation.Hybrid,
  deployParams: [account.address, [], [], []],
  deploySalt: '0x',
  signer: { account },
})

export const bundlerClient = createBundlerClient({
  client: publicClient,
  transport: http('https://api.pimlico.io/v2/11155111/rpc?apikey=<YOUR-API-KEY>'),
})

export const paymasterClient = createPaymasterClient({
  // You can use the paymaster of your choice
  transport: http('https://api.pimlico.io/v2/11155111/rpc?apikey=<YOUR-API-KEY>'),
})

```