> For the complete documentation index, see [llms.txt](https://andrecronje.gitbook.io/yearn-finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://andrecronje.gitbook.io/yearn-finance/developers/misc-resources/smart-contract-api.md).

# Smart Contract API

- [APR](https://andrecronje.gitbook.io/yearn-finance/developers/misc-resources/smart-contract-api/apr.md)
- [iToken](https://andrecronje.gitbook.io/yearn-finance/developers/misc-resources/smart-contract-api/itoken.md)
- [Zap](https://andrecronje.gitbook.io/yearn-finance/developers/misc-resources/smart-contract-api/zap.md)