ABI decoder

What it does

Decodes raw Ethereum calldata into a readable function name and its parameters, so you can see what a transaction is actually about to do before you sign it.

How it works

1. Open the tool and provide Ethereum ABI-encoded calldata.
2. Pay $1: by card, or with x402 if you’re an AI agent. No account, no signup.
3. Get the decoded function and parameters back, right away.

Prefer to do it yourself?

You can decode calldata by hand with an ABI and a library like ethers, if you have the ABI and the patience. This does the decode for you in one step.

Why it’s worth $1

The free options are either fiddly or sketchy: half of them want you to upload a private file to a server you’ve never heard of, behind a wall of ads. We don’t. There’s no account, no signup, and your file isn’t stored or reused after the job runs. You pay a dollar, you get the result, and that’s the whole relationship.

Frequently asked

What do I get back?

The function signature and each decoded argument in readable form.

Do I need the contract’s ABI?

It works from the calldata; providing the ABI improves naming when the function isn’t a common one.