How Many Token Approvals Have You Forgotten About?
Every time you interact with a DeFi protocol, the first step is almost always an approval. You authorize a smart contract to move a specific token on your behalf. It feels like a one-time setup, a single click before the real transaction proceeds. The problem is that door does not close on its own.
Token approvals do not expire when you complete a transaction. They do not disappear when you close your browser or disconnect your wallet. The approval you gave a DEX last year is still active. The protocol you tried once and never returned to still holds that permission. Unless you explicitly revoke it, it stays open indefinitely.
In March 2024, a DeFi protocol called Dolomite was exploited for over $1.8 million. The attacker did not use a sophisticated technique. They used an old contract that had been deployed in 2019 and long since discontinued. The contract was no longer in use, but users who had interacted with it years earlier had never revoked their approvals. The attacker found that forgotten entry point and walked through it. The victims had done nothing wrong. They had simply clicked an approval button five years earlier and forgotten about it.
The problem with approvals goes beyond being forgotten. Many protocols request unlimited approvals by default. Not "allow this transaction to move 100 USDC," but "allow this contract to move all of your USDC, with no limit, forever." This is more convenient for the protocol since users only need to approve once and can interact repeatedly without re-approving. But it also means that if that contract is ever compromised, the attacker can take everything, not just the amount involved in a single transaction.
Your relationship with those protocols is not static. Contracts can be upgraded. Development teams can walk away. Admin keys can be compromised. When any of those things happen, the attacker does not need your private key. A past approval is enough. Your wallet can be drained without your knowledge, without you signing anything new.
This is a layer of risk that few users think about proactively. When protocols are functioning as designed, those approvals sit quietly in the background and nobody notices them. They only become visible when something goes wrong, and by then it is usually too late.
How many smart contracts currently hold approvals to your wallet? It may be time to find out.
Those approvals are visible, and they can be revoked. Your wallet holds a record of every permission you have ever granted, most of which you have probably never reviewed in full. Seeing that list clearly is the first step toward understanding your actual exposure. ZenRealm's Wallet Permission Check tool can help you do exactly that. Enter your wallet address and within seconds you can see every active token approval across major EVM networks.
Related Reading:
You Think You're Logging In. You're Actually Granting Permission.