How to Check Token Approval in MetaMask?

Understanding Token Approval Mechanics

1. Token approval is a permission mechanism embedded in ERC-20 and ERC-721 standards that allows decentralized applications to spend or transfer tokens from a user’s wallet on their behalf.

2. Each approval is recorded as a transaction on-chain and tied to a specific smart contract address, amount limit, and timestamp.

3. Approvals do not expire automatically unless explicitly revoked or overwritten by a new approval with zero value.

4. MetaMask itself does not display active approvals within its UI; users must rely on external explorers or dedicated tools to audit them.

5. An unrevoked high-value approval for a compromised or abandoned dApp poses direct asset risk, even if the wallet remains otherwise secure.

Step-by-Step Manual Verification via Block Explorers

1. Open MetaMask and identify the wallet address under review — copy it precisely without spaces or extra characters.

2. Navigate to Etherscan.io (for Ethereum), BscScan.com (for BSC), or PolygonScan.com (for Polygon), depending on the network where the token resides.

3. Paste the wallet address into the search bar and select the “Token Approvals” tab located beneath the main address overview section.

4. The list displays all contracts granted spending rights, including spender address, token symbol, approved amount in raw units, and last interaction block.

5. Cross-reference spender addresses with known protocol domains using tools like rugcheck.xyz or official project documentation to verify legitimacy.

Using Third-Party Safety Tools

1. Visit revoke.cash and connect the same wallet used in MetaMask via WalletConnect or injected provider.

2. The interface auto-detects all active approvals across supported chains and groups them by risk level: “High”, “Medium”, and “Low”.

3. Click “Revoke” next to any suspicious or obsolete approval — this triggers a zero-approval transaction signed through MetaMask.

4. Confirm gas settings and sign the transaction; the revocation appears on-chain within seconds on most EVM networks.

5. Repeat the process after major dApp interactions, especially following liquidity additions, NFT mints, or bridge operations.

Recognizing Dangerous Approval Patterns

1. A single contract holding unlimited allowance (e.g., 115792089237316195423570985008687907853269984665640564039457584007913129639935) indicates maximum delegation.

2. Approvals granted to addresses lacking verified source code or matching no known protocol deployment on Etherscan represent high red flags.

3. Multiple approvals pointing to identical proxy contracts — especially those with names like “Router”, “Vault”, or “Manager” — may signal aggregated control surfaces.

4. Contracts deployed less than 72 hours ago with non-zero approvals should be treated as untrusted until independently audited.

5. Any approval associated with a domain that recently changed ownership or shows mismatched SSL certificate metadata requires immediate scrutiny.

Frequently Asked Questions

Q: Can I see token approvals directly inside MetaMask without external sites?A: No. MetaMask does not surface approval data in its interface. Users must use blockchain explorers or revoke platforms to inspect permissions.

Q: Does changing my MetaMask password reset or clear existing token approvals?A: No. Password changes affect only local wallet access. All on-chain approvals remain fully active and unchanged.

Q: Why does a revoked approval still appear in Etherscan’s “Token Approvals” list after signing the transaction?A: It reflects the historical state before revocation. After confirmation, the approved amount updates to zero. Refresh the page or check the transaction’s internal logs to confirm execution.

Q: Is it safe to approve a contract that has no verified code on Etherscan?A: It is highly unsafe. Unverified contracts cannot be audited for malicious logic. Never grant allowances to such addresses under any circumstance.