# Request ID The Request ID is a unique on-chain and off-chain identifier genrated at runtime for a request. On-chain, Midpoint maintains the uniqueness of this rolling ID by incrementing the on-chain Request ID for each request. This Request ID is returned to the contract that initiated the midpoint request. This is done inside [Startpoints](/midpoint-documentation/more-reading/startpoints.md), and each chain generates a Request ID that is unique to its chain. Off-chain, Midpoint assigns a unique rolling ID for each request that is generated. Request IDs allow serialization of requests as they move off-chain and then back on-chain. By posting the request ID back on-chain, you can tie a response to a particular request. --- # 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.midpointapi.com/midpoint-documentation/core-concepts/requests/request-id.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.