> For the complete documentation index, see [llms.txt](https://docs.essencefinance.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.essencefinance.io/development/smart-contracts/external.md).

# External

- [Decimal](https://docs.essencefinance.io/development/smart-contracts/external/decimal.md)
- [WETH9](https://docs.essencefinance.io/development/smart-contracts/external/weth9.md)