# Authentication

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The MadKudu API uses API keys to authenticate requests. Follow [this article ](https://developers.madkudu.com/getting-started/quickstart)to get your API key.

All API requests must be made over [HTTPS](http://en.wikipedia.org/wiki/HTTP_Secure). Calls made over plain HTTP will fail.&#x20;

The API Key must be passed in the `X-API-Key` header for **every requests**. API requests without authentication will also fail.