# UserOperation.getSignPayload

Obtains the signing payload for a [`UserOperation.UserOperation`](/ercs/erc4337/UserOperation/types#useroperation).

## Imports

:::code-group
```ts [Named]
import { UserOperation } from 'ox/erc4337'
```

```ts [Entrypoint]
import * as UserOperation from 'ox/erc4337/UserOperation'
```
:::

## Examples

```ts twoslash
import { Secp256k1, Value } from 'ox'
import { UserOperation } from 'ox/erc4337'

const userOperation = UserOperation.from({
  callData: '0xdeadbeef',
  callGasLimit: 300_000n,
  maxFeePerGas: Value.fromGwei('20'),
  maxPriorityFeePerGas: Value.fromGwei('2'),
  nonce: 69n,
  preVerificationGas: 100_000n,
  sender: '0x9f1fdab6458c5fc642fa0f4c5af7473c46837357',
  verificationGasLimit: 100_000n
})

const payload = UserOperation.getSignPayload(
  userOperation,
  {
    // [!code focus]
    chainId: 1, // [!code focus]
    entryPointAddress:
      '0x1234567890123456789012345678901234567890', // [!code focus]
    entryPointVersion: '0.6' // [!code focus]
  }
) // [!code focus]

const signature = Secp256k1.sign({
  payload,
  privateKey: '0x...'
})
```

## Definition

```ts
function getSignPayload<entrypointVersion>(
  userOperation: UserOperation<entrypointVersion>,
  options: getSignPayload.Options<entrypointVersion>,
): Hex.Hex
```

**Source:** [src/erc4337/UserOperation.ts](https://github.com/wevm/ox/blob/main/src/erc4337/UserOperation.ts#L1098)

## Parameters

### userOperation

* **Type:** `UserOperation<entrypointVersion>`

The user operation to get the sign payload for.

#### userOperation.callData

* **Type:** `0x${string}`

The data to pass to the `sender` during the main execution call.

#### userOperation.callGasLimit

* **Type:** `bigintType`

The amount of gas to allocate the main execution call

#### userOperation.initCode

* **Type:** `0x${string}`
* **Optional**

Account init code. Only for new accounts.

#### userOperation.maxFeePerGas

* **Type:** `bigintType`

Maximum fee per gas.

#### userOperation.maxPriorityFeePerGas

* **Type:** `bigintType`

Maximum priority fee per gas.

#### userOperation.nonce

* **Type:** `bigintType`

Anti-replay parameter.

#### userOperation.paymasterAndData

* **Type:** `0x${string}`
* **Optional**

Paymaster address with calldata.

#### userOperation.preVerificationGas

* **Type:** `bigintType`

Extra gas to pay the Bundler.

#### userOperation.sender

* **Type:** `abitype_Address`

The account making the operation.

#### userOperation.signature

* **Type:** `0x${string}`

#### userOperation.verificationGasLimit

* **Type:** `bigintType`

The amount of gas to allocate for the verification step.

### options

* **Type:** `getSignPayload.Options<entrypointVersion>`

## Return Type

The signing payload for the user operation.

`Hex.Hex`