Can a Token Approval Let a Scammer Spend Your Tokens?
An approval gives a contract direct, ongoing permission to move your tokens — no further signature needed. Here's exactly what that makes possible.
Yes — and this is worth understanding precisely, because it's not a hypothetical vulnerability or an edge case. It's exactly what an approval is designed to allow, which is what makes a malicious one so effective.
What an Approval Actually Grants, Technically
An approval isn't a suggestion that requires further confirmation later — it's a direct, on-chain permission. Once granted, the approved address can call a transfer function that moves tokens out of your wallet, up to the approved amount, at any time.
Why This Doesn't Require "Hacking" Your Wallet
A scammer who has an approval from your wallet doesn't need your private key, doesn't need to compromise your device, and doesn't need any further interaction from you at all.
What This Looks Like When It Happens
Typically, nothing happens for a period of time after the approval is granted. Then, without any further action from the wallet owner, the tokens simply move out.
Why the Delay Between Approval and Theft Can Make This Harder to Trace
Because the actual transfer can happen well after the approval was originally signed, victims sometimes don't connect the theft back to a specific earlier transaction.
What Limits the Damage
The only hard limit on what a malicious approval can take is the approved amount itself, and the wallet's actual balance of that specific token — exactly why unlimited approvals carry disproportionate risk.
What You Can Do About an Existing Approval
An approval can be revoked at any time by sending a new transaction that sets the approved amount back to zero.
Check your wallet for active approvals and revoke any you don't recognize or no longer need — this is the only direct control you have over standing risk that's already been granted.