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

# Authentication

> Authenticate REST and MCP with one scoped Landryx API key.

Use either supported REST header:

```http theme={null}
Authorization: Bearer landryx_...
```

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

Keys inherit the scopes allowed by the organization plan. Common scopes include `parcel:read`, `zoning:read`, `infrastructure:read`, `environmental:read`, `deeds:read`, `construction:read`, `listings:read`, `commercial:read`, and `exports:create`.

Secrets are shown once, HMAC-hashed at rest, and should be rotated immediately if exposed.