ERC20 Permit Generator

Generate EIP-2612 permit signatures for gasless token approvals

Security Warning: Never share your private key. This tool demonstrates the EIP-2612 permit structure. For production use, integrate with a wallet (MetaMask, WalletConnect) to sign permits client-side.

Owner Address

Spender Address

Token Amount (in wei/raw units)

Token Contract Address

Chain ID

1 = Ethereum, 137 = Polygon, 42161 = Arbitrum, 10 = Optimism

Deadline (optional - defaults to 24h from now)

Nonce

Usually 0 for the first permit. Query the contract for the current nonce.

Private Key (Optional - Not Recommended)