# Rate Feed The upper bound for a `KIBT` rate of a risk category is the central bank rate coupon of the most recently issued bond for the risk category. This central bank rate is served on-chain by the `RateFeed` contract. Each central bank rate is given in terms of the per-second coupon, matching the format used in the `coupon` property in `KUMABondNFTs` . The `RateFeed` queries oracles, referenced as `MCAGAggregator` contracts, that follow Chainlink's `AggregatorV3Interface` for the rate data. Each `MCAGAggregator` serves the most recent coupon data for each risk category, and is managed by `MCAG`. --- # 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.kuma.bond/kuma-protocol/developers/smart-contract-architecture/rate-feed.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.