> For the complete documentation index, see [llms.txt](https://contracts.synapseprotocol.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://contracts.synapseprotocol.com/messaging/dfk/auctions.md).

# auctions

- [AssistingAuctionUpgradeable](https://contracts.synapseprotocol.com/messaging/dfk/auctions/assistingauctionupgradeable.md)
- [ERC721AuctionBaseUpgradeable](https://contracts.synapseprotocol.com/messaging/dfk/auctions/erc721auctionbaseupgradeable.md)
- [HeroAuctionUpgradeable](https://contracts.synapseprotocol.com/messaging/dfk/auctions/heroauctionupgradeable.md)
- [helpers](https://contracts.synapseprotocol.com/messaging/dfk/auctions/helpers.md)
- [CrystalFeesUpgradeable](https://contracts.synapseprotocol.com/messaging/dfk/auctions/helpers/crystalfeesupgradeable.md)
- [interfaces](https://contracts.synapseprotocol.com/messaging/dfk/auctions/interfaces.md)
- [IAssistingAuctionUpgradeable](https://contracts.synapseprotocol.com/messaging/dfk/auctions/interfaces/iassistingauctionupgradeable.md)