Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesTo revoke a risky marketplace or smart-contract approval, find the permission on the network where you granted it, submit a revocation transaction from the wallet that owns it, and verify the change after it confirms. Disconnecting a site from your wallet is not enough: it can end the wallet connection without cancelling an on-chain token allowance.
What an approval does—and what disconnecting does not do
A token approval gives a spender contract permission to access specified assets. ERC-20 allowances apply to fungible tokens; ERC-721 and ERC-1155 approvals apply to NFTs. Merely connecting a wallet to a dApp does not, by itself, grant that token-moving permission.
Disconnecting a dApp affects its wallet connection and access to public account information. An approval already recorded on-chain can remain active while the dApp is disconnected. Revoking an approval instead removes the relevant token-moving permission once the revocation transaction confirms.
Permissions are specific to a token or collection and a blockchain network. Review each network where you used a marketplace or other dApp; an Ethereum checker will not list approvals granted on Polygon or another chain.
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How do I revoke approvals?
- Choose the account and network. Open your wallet’s official approval-management feature or navigate directly to a well-known approval checker. Verify the site’s domain before connecting. Select the wallet account that granted the approval and the chain where it was created.
- Review the listed permissions. Check the token or NFT collection, spender contract, allowance amount or operator permission, and network. Decide which permissions you still need. A project name shown beside a spender is not, by itself, proof that the contract is safe. OpenSea’s Ethereum instructions describe Etherscan’s Token Approval tool and note that it is a third-party service: OpenSea: How can I revoke token approvals and permissions on Ethereum?
- Submit a revocation for the permission you no longer want. Use the checker or wallet interface’s revoke action. The wallet will ask you to approve an on-chain transaction. Read the transaction details and confirm that they correspond to the permission you intend to revoke before signing. Revocation requires gas; the amount varies with network conditions, so there is no fixed fee to rely on.
- Verify the result. After the transaction confirms, refresh the approval list or reconnect to the checker and check the same account and network again. ethereum.org recommends reconnecting after a few minutes to verify the change: ethereum.org: How to revoke smart contract access to your crypto funds.
- Repeat on other networks. Switch networks and review the wallet’s activity on each chain where you used dApps. A successful revocation on Ethereum does not change a permission on Polygon or another network.
Which approvals are worth reviewing?
Unlimited ERC-20 allowances
An unlimited allowance authorizes the spender to use the maximum possible amount of that token and remains usable until you revoke it. If the spender is compromised, the approved token balance may be exposed. Ethereum.org explains the risk in its revocation guide.
A limited allowance caps how many tokens the spender is authorized to use. It can reduce the amount exposed, but you may need to approve more tokens later, which means another transaction and network fee. MetaMask explains the distinction in its token approvals explainer.
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| Allowance type | Maximum amount authorized | How long it remains usable | Convenience and fees |
|---|---|---|---|
| Limited | Up to the amount specified | Until revoked or otherwise no longer usable | May require another approval transaction when you need to authorize more tokens |
| Unlimited | The maximum possible amount of the token | Until manually revoked | Fewer repeated approval prompts, but potentially more token balance exposed |
NFT collection approvals
NFT approvals can authorize a marketplace or other spender to transfer particular NFTs or, with an operator approval, assets across a collection. Revoke permissions you no longer want, while checking the exact collection and spender shown in the approval details.
What happens to listings and transfers after revocation?
Revoking an NFT approval can prevent a marketplace from buying, selling, or transferring the NFT under that permission until you approve it again. OpenSea says its services need the relevant approval to act on NFTs, and Revoke.cash notes that active OpenSea listings require approvals to remain active. If you revoke an approval needed for a listing, expect to grant it again before the marketplace can carry out the listing or transfer. See OpenSea’s revocation instructions and Revoke.cash’s FAQ.
Revocation only prevents future use of that permission after the revocation transaction confirms. It does not undo a transfer that already happened or recover assets already moved.
Which approval-management method should you use?
Wallet-native tools and third-party checkers can both help, but their supported chains and approval types differ. Choose a tool that supports the account and network you need to review, and confirm the details in the wallet before signing a transaction.
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| Method | Network coverage | Approval types | Interface and compatibility |
|---|---|---|---|
| MetaMask Portfolio approval management | Ethereum Mainnet, Polygon, and BNB Chain were listed in MetaMask’s help documentation accessed October 4, 2026 | Review the supported approval types in the current interface | Wallet-linked MetaMask Portfolio feature; availability can change. MetaMask Help Center instructions |
| Etherscan Token Approval tool | Ethereum | Token approvals available through the tool | Third-party block explorer; OpenSea’s instructions identify it as an option for Ethereum. OpenSea instructions |
| Revoke.cash | Use its current interface to check whether your network is supported | ERC-20 and standard ERC-721/ERC-1155 approvals described in its documentation | Third-party approval checker. Revoke.cash FAQ |
Why might an approval not appear?
Approval checkers depend on contract behavior and the events they can index. Revoke.cash says its NFT detection uses standard ERC-721 and ERC-1155 approval events; older collections such as CryptoKitties may not emit the events standard checkers use. A clean result therefore does not prove that every historical or custom permission has been found. If an expected approval is missing, consult the collection’s official documentation or an appropriate block explorer rather than assuming no permission exists.
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How to reduce future approval risk
- When a wallet or dApp offers the choice, authorize only the token amount you expect to use rather than an unlimited allowance.
- Review the spender contract and network in the wallet prompt before signing an approval or revocation transaction.
- Periodically inspect approvals on each network where you have used dApps, especially when you stop using a marketplace or no longer recognize a spender.
- A hardware wallet is an optional additional security measure for signing, but it does not remove approvals already recorded on-chain. OpenSea discusses hardware wallets as another layer of security in its NFT safety guide.
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