# Rate Limits Rate limit applies per API key. The limit varies by endpoint and plan. ### Read response header * `X-RateLimit-Limit`: Max request count in the window * `X-RateLimit-Remaining`: Remaining request count * `X-RateLimit-Reset`: UTC epoch when the window resets ### Handle 429 Stop and wait until the reset time. Retry with backoff and jitter. Avoid parallel burst traffic. --- # 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://integrations.impact.com/api-reference/rate-limits.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.