How to Review Token Approvals in a Web3 Wallet

In the rapidly evolving world of Web3, where decentralized applications (dApps), decentralized finance (DeFi) protocols, and non-fungible token (NFT) marketplaces have become integral parts of daily crypto interaction, understanding how to manage token approvals in your Web3 wallet is one of the most critical skills for protecting your digital assets. Token approvals are permissions you grant to smart contracts to spend a certain amount of your tokens on your behalf, and while they are essential for using nearly every dApp, they also pose significant security risks if left unmanaged. Many users accidentally grant unlimited approvals to malicious or compromised contracts, putting their entire token holdings at risk of being drained without warning. Regularly reviewing these approvals is not just a best practice—it’s a necessary step to maintaining control over your crypto portfolio in an ecosystem where you are your own bank.

To begin the process of reviewing token approvals, you first need to understand what exactly you are looking for and why it matters. When you connect your wallet to a dApp like a decentralized exchange (DEX), a yield farming platform, or an NFT marketplace, the dApp will often request approval to access specific tokens in your wallet. For example, if you want to swap ETH for USDC on a DEX, you must first approve the DEX’s smart contract to pull your USDC from your wallet when the swap executes. The problem arises when users mindlessly click “approve” without checking the details, often selecting the “unlimited” approval option to avoid having to approve again for future transactions. While unlimited approvals are convenient, they mean the contract can spend any amount of that token at any time, even after you stop using the dApp. If the dApp’s smart contract is later hacked, exploited, or turns out to be a scam, the attackers can use that existing approval to steal all of your tokens of that type without you ever signing a new transaction.

The first step to reviewing your token approvals is choosing the right tool for your blockchain network. Different blockchains have different block explorers and approval management tools, and since most Web3 wallets support multiple networks, you’ll need to review approvals on each chain you actively use. For Ethereum, the most popular and comprehensive tool is Etherscan’s Token Approval Checker, which allows you to connect your wallet or enter your wallet address to see a full list of all ERC-20 and ERC-721 token approvals associated with your address. Other EVM-compatible chains like BNB Chain, Polygon, Arbitrum, Optimism, and Avalanche have similar tools on their respective block explorers—BscScan for BNB Chain, Polygonscan for Polygon, Arbiscan for Arbitrum, and so on. These tools work by scanning the blockchain for all approval transactions you have signed and compiling them into an easy-to-read list that shows each token, the approved spender contract, the amount approved, and the date of the last approval.

For users who prefer a more integrated experience directly in their wallet, many popular Web3 wallets now include built-in approval management features. MetaMask, the most widely used non-custodial wallet, added a Token Permissions section in its settings that lets users view and revoke approvals for all EVM networks without leaving the wallet interface. Similarly, wallets like Trust Wallet, Coinbase Wallet, and Phantom (which supports both Solana and EVM chains) have added similar features in recent years as security awareness has grown. Using your wallet’s built-in tool is often the most user-friendly option, especially for beginners, as it eliminates the need to navigate multiple block explorer websites and ensures you are interacting with verified interfaces directly from your wallet provider.

Once you have accessed your list of approvals, whether through a block explorer or your wallet, the next step is to carefully audit each entry to determine which ones are safe to keep and which should be revoked. Start by identifying the spender contract for each approval—this is the address of the smart contract that has permission to spend your tokens. If you recognize the spender as a dApp you use regularly, like Uniswap, Aave, or OpenSea, check the approval amount to see if it is unlimited or a specific finite amount. For dApps you still use, consider whether an unlimited approval is necessary, or if you could reduce the approval to only the amount you plan to use in the near future. Many newer dApps now default to asking for approvals of exact transaction amounts, which is a much safer practice that you should prioritize whenever possible.

For approvals from dApps you no longer use, or dApps you don’t recognize at all, you should revoke them immediately. Unrecognized approvals are a major red flag, as they could indicate that you have previously interacted with a malicious dApp or signed a fraudulent approval transaction without realizing it. Even if you don’t have any tokens of that particular type in your wallet right now, it’s still a good idea to revoke the approval, because if you ever receive those tokens in the future, the malicious contract could immediately drain them before you even notice they are there. It’s also important to note that revoking an approval does not affect your ability to use the dApp again in the future—you can always grant a new approval the next time you interact with the dApp, so there is no downside to revoking approvals you don’t currently need.

The process of revoking an approval is relatively simple, but it’s important to do it correctly to avoid mistakes. Most approval management tools will have a “revoke” or “revoke approval” button next to each entry in your approval list. When you click this button, your wallet will pop up with a transaction request to revoke the approval. Revoking an approval does cost a small amount of gas, just like any other blockchain transaction, because it requires writing a new transaction to the blockchain to update the approval status of the contract. Many users hesitate to revoke approvals because of the gas cost, but this is a small price to pay for the security of your assets—especially if you hold large amounts of tokens that could be stolen by a malicious approved contract. On low-fee chains like Polygon or BNB Chain, gas costs for revocations are usually less than a cent, making