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

# Authorization

<Note>
  Most of our service endpoint APIs require an `API key` for authentication. To obtain an `API key`, please [contact us](https://blockrush.io/contact) directly and we'll set you up with the appropriate access credentials.
</Note>

## Request and Response Format

* Protocol: HTTP/HTTPS
* Timezone: UTC
* Response Format: JSON (the health endpoint returns plain text "ok")
* Header:

```shell theme={null}
Content-Type: application/json
x-api-key: <YOUR_API_KEY>
```

<Note>
  The health endpoint does not require `x-api-key` header, all other write operation endpoints require it.
</Note>