> For the complete documentation index, see [llms.txt](https://docs.fantom.foundation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fantom.foundation/build-on-opera/providers/contracts.md).

# Contracts

- [Chainstack](https://docs.fantom.foundation/build-on-opera/providers/contracts/chainstack.md)
- [thirdweb](https://docs.fantom.foundation/build-on-opera/providers/contracts/thirdweb.md)
- [GetBlock](https://docs.fantom.foundation/build-on-opera/providers/contracts/getblock.md)