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What will this transaction do?

Paste a transaction or signature request before you approve it: balance changes, permissions, who gets what and red flags, in plain words. Nothing is signed.

Read-only: we simulate it against the latest block. Nothing is signed or sent.

Where do I find what to paste?
  • Most wallets show the raw data under “Details” or “Hex” on the confirmation screen: copy the contract address (to) and the data.
  • Signature requests (“Permit”, “PermitSingle”, an NFT listing): copy the message JSON. A signature can move your tokens later without another confirmation.
  • Solana: copy the base64 transaction some dapps and wallets offer under “Advanced”.
  • We decode approve, increaseAllowance, setApprovalForAll, transfers, EIP-2612 permit, Permit2, multicall and Seaport orders, and simulate everything else.
What will this transaction do?