Why Are Unlimited Token Approvals Dangerous?

An unlimited token approval isn't dangerous because of what it does the moment you grant it — nothing happens immediately. It's dangerous because of what it makes possible later, sometimes long after you've forgotten the approval ever existed.

The Permission Doesn't Expire With the Transaction

A normal transaction has a clear beginning and end. An unlimited approval is different: once granted, it remains active indefinitely, as a standing permission sitting in the background, until you or someone else revokes it.

What Happens if the Approved Contract Is Compromised

If the contract you approved is later found to contain a vulnerability, that unlimited approval becomes something an attacker can use directly — draining the full balance of that token from every wallet that granted it, all at once, without needing any further signature from the wallet owners.

Why Old, Forgotten Approvals Are Often the Riskiest

An approval granted for a legitimate purpose months or years ago doesn't disappear once you stop using that app. If that app is later compromised or abandoned, every wallet that approved it remains exposed.

Why This Compounds Across Multiple Approvals

Most active crypto users accumulate approvals across many different apps over time, often without tracking which ones they've granted — each one a separate standing exposure.

The Difference Between Risk and Certainty

Having an unlimited approval to a contract doesn't mean that contract will definitely be exploited — the risk is asymmetric rather than certain, the same asymmetry that makes malicious approvals so effective when they do succeed.

Check which contracts your wallet has approved, and for how much — this is the only way to know your actual exposure right now, not just at the moment you approved.