# Authentication ## How Authentication Works * Include your API Key in the Request Headers for every API call: ``` Authorization: YOUR_API_KEY_HERE Content-type: application/json ``` ### Error Responses * If authentication fails, you'll receive one of these error responses: ``` 401 Unauthorized: Invalid or missing API key 403 Forbidden: API key valid but insufficient permissions 429 Too Many Requests: Rate limit exceeded for your API key — check your current package or Pay-as-you-go limits to view your allowed requests per second ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://developers.crawlbyte.ai/authentication.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.