shazow/whatsabi

Health v2 · maintenance only

Adoption not part of the score

1160 stars · 92 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

WhatsABI is a small TypeScript library that guesses an ABI and detects proxy contracts directly from Ethereum bytecode, even for unverified contracts. It works in the browser and embeds in wallets, block explorers, and other web3 tooling, integrating with Ethers.js, Viem, and Web3.js.

Use cases

• extract an ABI from unverified Ethereum contract bytecode
• resolve proxy contracts behind a contract address
• look up function signatures from selectors
• build a procedural frontend for arbitrary smart contracts
• embed contract analysis in a web3 wallet
• analyze EVM bytecode in a block explorer

When to choose

• you need ABI info for contracts without verified source code
• you want a tiny, browser-runnable library with minimal dependencies
• you need proxy contract detection
• you work with contracts written in languages other than Solidity, like Vyper

When to avoid

• you need full decompilation or deep static analysis of EVM bytecode
• you already have verified source code and can compile the ABI yourself
• you need a non-JavaScript environment without a JS runtime

Facets

library · maturity active

parser developer-tools sdk blockchain developer-tools apis browser cross-platform ethereum evm bytecode-analysis abi web3 proxy-detection smart-contracts nodejs typescript

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