Why Token Allowances are a Silent Risk
Every time you approve a decentralized exchange, lending pool, or NFT marketplace to handle your tokens, you grant that smart contract permission to move tokens from your wallet. If you do not revoke those permissions after the trade is complete, that allowance remains active on the blockchain forever.
The Supply-Chain Exploit Vector:
If a DeFi protocol developer’s computer is compromised and a malicious upgrade is pushed to a contract you approved months ago, attackers can drain your wallet balance instantly without your signature.
Weekly 10-Minute Wallet Audit Routine
Incorporate wallet maintenance into your weekly trading review:
- Step 1: Connect your wallet to Revoke. Cash or Rabby Wallet’s built-in Approval Manager.
- Step 2: Scan Ethereum, Arbitrum, Base, Optimism, and Polygon network tabs.
- Step 3: Revoke any unlimited approvals for protocols you are not actively using this week.
- Step 4: Verify that your primary cold storage address has zero active smart contract approvals.
Proactive Protection Rules
When swapping tokens on Uniswap or CowSwap, select 'Custom Approval Amount' and enter only the exact dollar amount of the current transaction. This prevents leaving open allowances after the trade finishes.