Signature Lab

Debug EIP-712 typed data and ERC-20 permit signatures before shipping onchain flows.

EIP-712 Typed Data Verifier

Typed data JSON

{
  "domain": {
    "name": "Permit2",
    "chainId": 1,
    "verifyingContract": "0x000000000022D473030F116dDEE9F6B43aC78BA3"
  },
  "types": {
    "PermitSingle": [
      {
        "name": "details",
        "type": "PermitDetails"
      },
      {
        "name": "spender",
        "type": "address"
      },
      {
        "name": "sigDeadline",
        "type": "uint256"
      }
    ],
    "PermitDetails": [
      {
        "name": "token",
        "type": "address"
      },
      {
        "name": "amount",
        "type": "uint160"
      },
      {
        "name": "expiration",
        "type": "uint48"
      },
      {
        "name": "nonce",
        "type": "uint48"
      }
    ]
  },
  "primaryType": "PermitSingle",
  "message": {
    "details": {
      "token": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "amount": "1000000",
      "expiration": "1735689600",
      "nonce": "0"
    },
    "spender": "0x111111125421ca6dc452d289314280a0f8842a65",
    "sigDeadline": "1735689600"
  }
}

Signature (r,s,v)

Expected signer (optional)

Permit Debugger (EIP-2612)

RPC preset

RPC URL

Token

Owner

Spender

Value (uint256)

Nonce (uint256)

Deadline (unix timestamp)

Chain ID

Domain name

Domain version

Permit signature