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

# Authentication

Authenticate every request with your Ledgerize API key via the `X-Api-Key` header.

```http theme={null}
X-Api-Key: <your-ledgerize-api-key>
```

Your key is available in your Ledgerize account under Settings → API Access. Do not expose this key in client-side code.