> ## 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 protected Utexo Swap API requests with the API key assigned to your integration.

## API key authentication

Send the assigned API key in the `X-API-Key` request header for every protected request:

```http theme={null}
X-API-Key: API_KEY_PLACEHOLDER
```

Utexo rejects requests with a missing or invalid API key.

<Note>
  Examples use `BASE_URL_PLACEHOLDER`. Obtain the environment-specific API base URL and API key from the Utexo team before integration. The base URL includes the `/v1` version prefix.
</Note>

## Request requirements

Include `X-API-Key` on every protected endpoint. Utexo rejects requests with a missing or invalid key. Do not expose the API key in client-side applications or public repositories.