Since Pectra, one signature can attach code to a normal wallet (EIP-7702). Attackers use that to install "sweepers" that forward anything you send to their address. Paste an address to see whether a delegation is set on Ethereum, Base, BNB Chain, Arbitrum, OP, Polygon, Gnosis and Unichain. Free. We never ask for keys or seed phrases.
Reads eth_getCode on 8 chains. A delegated wallet's code starts with 0xef0100 followed by the delegate contract address.
Analyses the delegate's bytecode for the sweeper shape (tiny contract + hard-coded forwarding address), checks source verification, gives a risk level and what to do. Up to 20 addresses per report. Paid with USDC on Base from your browser wallet, no gas.
GET /api/basic?address= free JSON. GET /v1/check?address=a,b,c via x402 v2 (USDC on Base). See openapi.json.