The answer
You cannot undo a confirmed historic transaction, but you can often revoke remaining token allowances to prevent future use of that permission.
What to do next
Use the correct chain’s allowance inspector and act promptly. If your seed phrase or private key is compromised, a new wallet is needed, not just revocation.
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Frequently asked questions
Will revoking an allowance recover already stolen USDC?
No. Revocation only changes future permission, not completed blockchain transfers.