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# `l2.estimateInitiateWithdrawalGas`

Estimates the L2 gas required to initiate a [withdrawal](/op-stack/withdrawals) through the L2 to L1 message passer.

## Usage

Estimate the gas for withdrawing one native token to an L1 recipient.

:::code-group
```ts twoslash [example.ts]
import { Value } from 'viem/utils'
import { client } from './viem.config'

const gas = await client.withdrawal.estimateInitiateWithdrawalGas({ // [!code focus:7]
  request: {
    gas: 21_000n,
    to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
    value: Value.fromEther('1'),
  },
})
// @log: 76901n
```

```ts twoslash [viem.config.ts] filename="viem.config.ts"
// [!include ~/snippets/op-stack/l2.config.ts:setup]
```
:::

### Standalone Action

Call `Actions.l2.estimateInitiateWithdrawalGas` directly by passing the Client as the first argument.

:::code-group
```ts twoslash [example.ts]
import { Actions } from 'viem/op-stack'
import { Value } from 'viem/utils'
import { client } from './viem.config'

const gas = await Actions.l2.estimateInitiateWithdrawalGas(client, { // [!code focus:7]
  request: {
    gas: 21_000n,
    to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
    value: Value.fromEther('1'),
  },
})
// @log: 76901n
```

```ts twoslash [viem.config.ts] filename="viem.config.ts"
// [!include ~/snippets/op-stack/l2.config.ts:setup]
```
:::

## Return Value

`bigint`

The estimated L2 gas required to initiate the withdrawal.

## Parameters

This action also accepts the transaction and block options from [`Actions.transaction.estimateGas`](/docs/actions/public/transaction/estimateGas), except `data`, `to`, and `value`. The withdrawal request supplies those fields for the message passer call.

### account

* **Type:** `Account | Address`

The Account or address used as the transaction sender during estimation.

### chain

* **Type:** `Chain | null`
* **Default:** `client.chain`

The L2 Chain containing the message passer contract.

### maxFeePerGas

* **Type:** `bigint | number | Hex`

The maximum total fee per gas in wei.

### maxPriorityFeePerGas

* **Type:** `bigint | number | Hex`

The maximum priority fee per gas in wei.

### nonce

* **Type:** `bigint | number | Hex`

The transaction nonce used during estimation.

### request

* **Type:** `Withdrawal.Request`

The withdrawal request passed to the L2 message passer.

#### request.data

* **Type:** `Hex`
* **Default:** `'0x'`

The encoded call data executed on L1.

#### request.gas

* **Type:** `bigint`

The gas limit for execution on L1.

#### request.to

* **Type:** `Address`

The L1 transaction recipient.

#### request.value

* **Type:** `bigint`

The value in wei withdrawn from L2 to L1.