Find the bugs that are off by 1012 and never throw
Paste the off-chain code that moves token amounts or hashes Ethereum data - a bot, a backend, a dashboard, an indexer. Your browser checks it for the silent decimal and hashing bugs for free, and nothing is uploaded. A paid run then audits it line by line or patches it.
Each example has a saved model run, so you can see the whole page for free.
Free tools (exact, in your browser)
Units
Type an amount.
Selector and topic
Type a signature.
Your recent audits
What this does, and what it does not
The prescan reads only the text you paste, with pattern checks drawn from the two source
skills: query decimals() at runtime, cache by chain and token address rather than
symbol, use exact math rather than floats, keep fallbacks visible, and never hash Ethereum
data with NIST SHA3-256 - Keccak-256 pads with 0x01 where SHA3-256 pads with 0x06, so the two
digests never match. Pattern checks can miss or over-read; the paid run answers each flag and
may dismiss one with a reason. Selectors and topics are computed here, in your browser, and
the model is told never to compute one.
The decimals shown for USDC, USDT, WBTC and DAI were read on-chain with decimals()
on 2026-09-26 (USDC and USDT are 6 on Ethereum, Arbitrum and Polygon, and 18 as Binance-Peg USDC
and BSC-USD on BNB Chain). Tokens change; your code should still ask the chain. Nothing here
calls a chain or runs your code. Derived from the agent skills
@affaan-m/evm-token-decimals and
@affaan-m/nodejs-keccak256
(affaan-m/everything-claude-code, MIT). The example modules are fictional.