Wallets
Typed Data Explainer
Paste the data a site asks you to sign. See what it really allows before you approve it.
Typed data
The JSON from an eth_signTypedData_v4 request. Nothing leaves your browser.
Accepts the typed data object, a JSON string of it, the params array [signer, data], or the full request. Press Ctrl + Enter to run.
Load example
What to do
- Never sign a permit, Permit2 approval or order for a spender you don't recognise. A signature can move tokens without any transaction from you.
- Listings and offers should only come from the marketplace you are actually using, and should pay you a fair price.
- If you already signed a permit or Permit2 approval, revoke it with the Approvals tool. An unused permit signature can still be submitted by anyone holding it until it expires.
- When in doubt, reject in your wallet. Rejecting a signature never costs anything.