Permit signature expired before the swap: what needs renewing?

An expired permit cannot be made valid by paying a higher transaction fee. You need a valid authorization under the permit scheme and fresh swap instructions where the quote has also expired.

Identify the expired field

For an ERC-2612 permit, the deadline limits when the signature can be submitted to change allowance. Permit2 has its own authorization structures, so a signature deadline and a stored allowance expiration can be different fields.

Record whether the error names a signature deadline, allowance expiration or swap deadline. Those labels point to different state. “Expired” alone is insufficient for support to determine which authorization failed.

Review the replacement request

Return to the genuine application rather than re-signing a payload supplied in a message. Verify the token, amount, spender, chain and verifying contract. The refreshed signature may authorize different terms if the application has rebuilt the route.

Check current allowance too. A prior permit may already have been submitted successfully even if the subsequent swap failed. In that case, the stored permission and the application’s stale signature are separate facts.

Do not extend expiry to an extreme future date merely to suppress the error. Longer validity can leave an unused authorization exercisable for longer. Use a duration you understand and check the transaction status before generating several overlapping requests.