# Rate Limiting **Overview** Sendstack API endpoint implements rate limits specifically for failed requests. These limits are designed to enhance security measures and ensure system stability. **Rate Limit Configuration** The rate limit for failed authentication requests is configured as follows: * **Window Period:** 15 minutes * Description: The time frame during which the rate limit is applied. * **Maximum Failed Requests:** 20 * Description: The maximum number of failed requests allowed within the specified window period. Exceeding 20 failed requests within a 15-minute window will result in an HTTP 429 (Too Many Requests) response. --- # 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://docs.sendstackhq.com/the-basics/rate-limiting.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.