Decode and explain an EVM transaction BEFORE signing it — the 'what am I about to sign?' check. Give it a chain + the transaction's to / data (calldata) / value and it returns a SAFE / REVIEW / DANGER verdict with a plain-English list of exactly what the transaction will do, flagging the dangerous things a wallet should never sign blindly: unlimited token approvals, EIP-2612 / Permit2 gasless permits, setApprovalForAll on NFTs, transferFrom drains, increaseAllowance top-ups, ownership transfers, multicall bundles that hide an approval, and calls to non-contract / upgradeable targets or approvals to a plain-wallet (EOA) spender. It also reads live on-chain context (is to a contract / proxy? is the spender an EOA?) and resolves token decimals so amounts are human-readable. Read-only; never signs or broadcasts. Use this whenever an agent is about to sign or relay a transaction it didn't fully construct. Chains: ethereum, base, bsc, polygon, arbitrum.

Decode a single piece of EVM calldata (the 4-byte selector + arguments) into its function and parameters. For full risk context (is the spender an EOA? is to a proxy?), use preview_transaction instead. Returns the function name and decoded args for the known supply-chain-relevant selectors (approve, permit, setApprovalForAll, transfer, transferFrom, increaseAllowance, transferOwnership, multicall).