> 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/helpers.md).

# helpers

- [CrystalFeesUpgradeable](https://contracts.synapseprotocol.com/messaging/dfk/auctions/helpers/crystalfeesupgradeable.md)