# Introduction These are the main contracts of Blueberry, responsible for being a record of storage, setting fees, and deployments. [BlueberryBank.sol](/developer-guides/contracts/blueberry-bank/blueberry-bank-contract.md) is the main contract that users interact with. It is important as it stores the user's positions and tracks the borrowing of tokens. * [Fee Manager](/developer-guides/contracts/blueberry-bank/fee-manager.md): Defines the types of fees taken in the protocol. * [ProtocolConfig](/developer-guides/contracts/blueberry-bank/protocolconfig.md): Defines all configurable states of the protocol. --- # 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/blueberry-bank/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.