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

# Authentication

> Authenticate B2B integration requests using the manually issued API key.

All B2B offramp and settlement requests to Rails must be authenticated with an API key.

API key issuance is handled manually through Telegram at `https://t.me/Oxbryte`.

### Authentication

Pass your API key in the `API-Key` header:

```http theme={null}
API-Key: 0e0e76d4-44ee-4d4a-8e51-2e1f6e6d8a7c
```