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

# API Authentication - How to Authenticate Requests

> Learn how to authenticate OddsPapi API requests using your API key. Simple query parameter authentication for all HTTP endpoints.

All HTTP endpoints require an `apiKey`.
You will only receive:

1. what you are requesting, filtered by
2. what you have access for

## How to authenticate

Pass your key as a query parameter:

```bash theme={null}
curl 'https://v5.oddspapi.io/en/bookmakers?apiKey=YOUR_KEY'
```