# Oracles The price oracle is a web server (or group of servers) that responds to requests for a price quote, which is a signed attestation of the Bitcoin to USD exchange rate at a specific point in time. Each quote includes a UTC timestamp and the corresponding exchange rate. Users can request a quote for the latest price or for a historical price by providing a specific timestamp. Each request also includes a threshold price, which is supplied by the user. This threshold is used by the oracle to generate a unique secret key. The key is then hashed and returned to the user along with the price quote. This protocol allows the price oracle to trigger stop-loss events within the DUCAT protocol without requiring any awareness of the protocol or its users. The event is triggered using a cryptographic hash embedded in Bitcoin Script, with the secret preimage revealed only when the threshold condition is met. --- # 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.ducatprotocol.com/how-ducat-works/oracles.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.