## Create x402 Sign-In-With-X payload

**Group:** Onchain APIs

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

## Usage

```
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

```
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.