> For the complete documentation index, see [llms.txt](https://docs.neglect.trade/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.neglect.trade/products/data-services/authentication.md).

# Authentication

All API requests require an API key.

**REST API** – Include your key in the request header:

```
Authorization: Bearer YOUR_API_KEY
```

**MCP Server** – Pass your key as a query parameter:

```
?apiKey=YOUR_API_KEY
```

API keys are tied to your account and determine your access level. Keep them secure and rotate them regularly.

<a href="https://neglect.trade/developers" class="button secondary">Get your API Key</a>