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# `l2.estimateL1Fee`

Estimates the [L1 data fee](https://docs.optimism.io/stack/transactions/fees#l1-data-fee) required to execute an L2 transaction.

## Usage

Estimate the L1 data fee for a native token transfer.

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

const fee = await client.fee.estimateL1Fee({ // [!code focus:4]
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: Value.fromEther('1'),
})
// @log: 1510504576n
```

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

### Standalone Action

Call `Actions.l2.estimateL1Fee` 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 fee = await Actions.l2.estimateL1Fee(client, { // [!code focus:4]
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: Value.fromEther('1'),
})
// @log: 1510504576n
```

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

## Return Value

`bigint`

The L1 data fee in wei.

## Parameters

### accessList

* **Type:** `AccessList`

The EIP-2930 access list included in the serialized transaction.

### account

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

The Account or address associated with the transaction.

### chain

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

The L2 Chain used to resolve defaults and the gas price oracle.

### chainId

* **Type:** `number`
* **Default:** `chain.id`

The Chain ID used to serialize the transaction.

### data

* **Type:** `Hex`

The contract bytecode or encoded function call.

### gas

* **Type:** `bigint`

The transaction gas limit.

### gasPriceOracleAddress

* **Type:** `Address`

An override for the OP Stack gas price oracle address.

### maxFeePerGas

* **Type:** `bigint`

The maximum total fee per gas in wei.

### maxPriorityFeePerGas

* **Type:** `bigint`

The maximum priority fee per gas in wei.

### nonce

* **Type:** `number`

The transaction nonce.

### to

* **Type:** `Address | null`

The transaction recipient.

### type

* **Type:** `'eip1559'`

The transaction envelope type.

### value

* **Type:** `bigint`

The value in wei sent with the transaction.