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

# Authorization

> Authenticate Utexo Swap API requests with your affiliate API key.

Affiliates must include their assigned API key in the `X-API-Key` header of every request. All requests are authenticated by validating this header; any request without a valid `X-API-Key` is rejected.

```http theme={null}
X-API-Key: <your_api_key>
```

Example:

```bash theme={null}
curl https://api-swap.utexo.com/affiliate/v1/networks \
  -H "X-API-Key: $UTEXO_SWAP_API_KEY"
```

<Warning>
  Keep the API key on your server. Do not ship it in browser or mobile client code.
</Warning>

To request an API key, [contact the Utexo team](https://utexo.com/contact-sales).