How to check active token approvals and revoke them on Etherscan?

Understanding Token Approvals on Ethereum

1. Token approvals are permission grants that allow smart contracts to spend a user’s ERC-20 tokens on their behalf.

2. These approvals are stored as entries on the Ethereum blockchain and remain active until explicitly revoked.

3. Each approval is tied to a specific token contract address and a spender address, forming a unique allowance record.

4. Users often grant approvals when interacting with decentralized exchanges, yield farming protocols, or NFT marketplaces.

5. Unchecked or forgotten approvals pose security risks, especially if the spender contract becomes compromised or deprecated.

Navigating Etherscan to View Active Approvals

1. Visit etherscan.io and paste your wallet address into the search bar.

2. Click on the “Token Approvals” tab located under the “More” dropdown in the top navigation bar of your address page.

3. The interface displays a paginated list of all current approvals associated with that wallet.

4. Columns include the token name, spender address, remaining allowance amount, and transaction hash of the original approval.

5. Filtering options let users sort by token symbol, spender name, or approval date — useful for identifying outdated or suspicious entries.

Revoking an Approval via Etherscan Interface

1. Locate the specific approval row you wish to revoke in the Token Approvals table.

2. Click the “Revoke” button adjacent to that entry — this initiates a new transaction request.

3. A modal appears showing the spender address, token contract, and estimated gas fee required to execute the revocation.

4. Confirm the action in your connected wallet (e.g., MetaMask), ensuring sufficient ETH is available for gas.

5. Once confirmed, the transaction propagates through the network; the approval status updates after block confirmation.

Verifying Revocation Success

1. After the revocation transaction receives at least one confirmation, return to the Token Approvals tab.

2. Refresh the page — the revoked entry should no longer appear in the active approvals list.

3. Cross-check using the transaction hash on Etherscan to confirm it executed the approve(address spender, uint256 amount) function with zero value.

4. Some tokens require manual inspection of the spender’s allowance via the token contract’s allowance(owner, spender) view function.

5. If the allowance still shows a non-zero value, the revocation may have failed or not yet been mined.

Frequently Asked Questions

Q: Can I revoke approvals for tokens I don’t currently hold?A: Yes. Token approvals are independent of token balance. Even if your wallet holds zero units of a given ERC-20, any existing approval remains active and must be revoked separately.

Q: Does revoking an approval affect staked assets or liquidity positions?A: Not directly. However, some DeFi protocols rely on persistent allowances to auto-compound rewards or rebalance pools. Revoking may interrupt such automated functions until a new approval is granted.

Q: Why do some approvals show “Unknown Spender”?A: This occurs when the spender address is not verified on Etherscan or lacks source code verification. Users should investigate such addresses carefully before granting or revoking permissions.

Q: Is there a way to revoke all approvals at once?A: No native batch-revocation tool exists on Etherscan. Each approval must be revoked individually. Third-party tools like Revoke.cash offer bulk interfaces but operate off-chain and initiate separate transactions per approval.