> For the complete documentation index, see [llms.txt](https://bitfi-2.gitbook.io/bitfi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bitfi-2.gitbook.io/bitfi/developer/bfbtc-overview/contract-abi.md).

# Contract ABI

The ABI of bfBTC contracts can be categorized into two types, with slight differences between them:

* Contracts that use ERC20 assets as underlying assets
* Contracts that use Gas Tokens as underlying assets

1. Contracts that use ERC20 assets as underlying assets

[Download ERC20 ABI (JSON)](https://github.com/bitfi-labs/BitFi-gitbook/blob/main/.gitbook/assets/bfbtc-contract-abi-erc20.json)

2. Contracts that use Gas Tokens as underlying assets (Only on Bitlayer)

[Download Gas Token ABI (JSON)](https://github.com/bitfi-labs/BitFi-gitbook/blob/main/.gitbook/assets/bfbtc-contract-abi-gastoken.json)

All contracts have been verified on their respective network explorers. You can also interact with the contracts directly through the appropriate block explorer for each network.