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

# API Authentication

> Authentication methods for the API

## Authentication

All API requests require a valid API key or OAuth token.

## Headers

```bash theme={null}
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json
```

See [Getting Started with Authentication](/authentication/getting-started) for more details.