# Introduction To get prices inside of the Blueberry Protocol. The usage of Oracles is required to ensure there is a fresh and valid price at all times. This ensures the safety and sustainability of the protocol. AggregatorOracle is a contract that provides aggregated price feeds from several oracle sources CoreOracle is a contract that provides price feeds to the Bank contract --- # 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://v1.docs.blueberry.garden/developer-guides/contracts/oracle/introduction.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.