> For the complete documentation index, see [llms.txt](https://bonsaiswap.gitbook.io/bonsaiswap-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bonsaiswap.gitbook.io/bonsaiswap-docs/developers/technical-reference/periphery/interfaces/external.md).

# external

- [IERC1271](https://bonsaiswap.gitbook.io/bonsaiswap-docs/developers/technical-reference/periphery/interfaces/external/ierc1271.md)
- [IERC20PermitAllowed](https://bonsaiswap.gitbook.io/bonsaiswap-docs/developers/technical-reference/periphery/interfaces/external/ierc20permitallowed.md)
- [IWETH9](https://bonsaiswap.gitbook.io/bonsaiswap-docs/developers/technical-reference/periphery/interfaces/external/iweth9.md)