> For the complete documentation index, see [llms.txt](https://docs.hatsprotocol.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hatsprotocol.xyz/for-developers/v1-protocol-spec/interfaces.md).

# Interfaces

- [IHats.sol](https://docs.hatsprotocol.xyz/for-developers/v1-protocol-spec/interfaces/ihats.sol.md)
- [IHatsIdUtilities.sol](https://docs.hatsprotocol.xyz/for-developers/v1-protocol-spec/interfaces/ihatsidutilities.sol.md)
- [IHatsEligibility.sol](https://docs.hatsprotocol.xyz/for-developers/v1-protocol-spec/interfaces/ihatseligibility.sol.md)
- [IHatsToggle.sol](https://docs.hatsprotocol.xyz/for-developers/v1-protocol-spec/interfaces/ihatstoggle.sol.md)