> ## Documentation Index
> Fetch the complete documentation index at: https://docs.neynar.com/llms.txt
> Use this file to discover all available pages before exploring further.

# createX402Siwx

Create x402 Sign-In-With-X payload

> **Group:** Onchain APIs

Use this when you need: **Create x402 Sign-In-With-X payload**.

## Usage

```ts theme={"system"}
import { NeynarAPIClient, Configuration } from "@neynar/nodejs-sdk";

const client = new NeynarAPIClient(
  new Configuration({ apiKey: "YOUR_NEYNAR_API_KEY" })
);

const res = await client.createX402Siwx({
  xWalletId: "example", // Wallet ID to use for transactions
  xApiKey: "example", // required
  createX402SiwxRequest: "value", // required
});
console.log(res);
```

## Parameters

| Parameter               | Type                    | Required | Description                       |
| ----------------------- | ----------------------- | :------: | --------------------------------- |
| `xWalletId`             | `string`                |     ✅    | Wallet ID to use for transactions |
| `xApiKey`               | `string`                |     ✅    | -                                 |
| `createX402SiwxRequest` | `CreateX402SiwxRequest` |     ✅    | -                                 |

## Response

Returns a `RequestArgs` object.

## Error Handling

```ts theme={"system"}
try {
  const res = await client.createX402Siwx({
    xWalletId: "example",
    xApiKey: "example",
    createX402SiwxRequest: "value"
  });
  // use res
} catch (err) {
  // Axios/HTTP errors, invalid params, auth issues, etc.
  console.error(err);
}
```

## Tips

* Provide a **viewerFid** when supported to respect mutes/blocks and include `viewer_context`.
* Keep requests scoped (e.g., use `limit`) to improve latency.
* Cache results where sensible.