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Whatsabi

whatsabi is an open-source Ethereum developer tool that guesses an ABI from Ethereum bytecode, even when source code is unavailable.
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1 current maintainer1 active lead

Maintainer signals as of Aug 10, 2026

WhatsABI

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Description

whatsabi is an MIT-licensed TypeScript library maintained by Andrey Petrov (shazow) that extracts ABIs and resolves proxy contracts from raw on-chain bytecode. Browser-embeddable, it is used by Otterscan, Sourcify, thirdweb, and Rivet, and is a recipient of Optimism RetroPGF grants.
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