# Auctioneer Interfaces The [Auctioneer Interface](https://github.com/Bond-Protocol/bond-contracts/blob/master/src/interfaces/IBondAuctioneer.sol) defines the external functions that all Auctioneer contracts must implement. Specifically, each Auctioneer should have the following functions: ```solidity createMarket closeMarket purchaseBond // Only Teller getMarketInfoForPurchase marketPrice payoutFor maxAmountAccepted isInstantSwap isLive getTeller getAggregator currentCapacity ``` #### Sequential Dutch Auction (SDA) Interface The [SDA Interface](https://github.com/Bond-Protocol/bond-contracts/blob/master/src/interfaces/IBondSDA.sol) extends the Auctioneer interface and adds two functions specific to Olympus' implementation: ```solidity currentDebt currentControlVariable ``` Additionally, it defines five structs that are used in the SDA implementation: ```solidity MarketParams BondMarket BondTerms BondMetaData Adjustment ``` #### Fixed Price Auctioneer (FPA) Interface The FPA Interface extends the Auctioneer interface and adds a couple functions specific to global FPA parameters. These functions are in lieu of the existing `setDefaults` and `setIntervals` functions, which, in hindsight, were too specific to the SDA case to be in the general Auctioneer Interface. ``` setMinMarketDuration setMinDepositInterval ``` Additionally, it defines three structs specific to the FPA implementation: ``` MarketParams BondMarket BondTerms ``` --- # 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://dev.bondprotocol.finance/smart-contracts/bond-system/auctioneer/auctioneer-interfaces.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.