Guide: How to Revoke Allowances on Atomic Wallet safely

Guide: How to Revoke Allowances on Atomic Wallet Safely

Introduction to Token Allowances and Their Importance

In the evolving landscape of decentralized finance (DeFi) and Web3 applications, interacting with smart contracts is a common practice. Many of these interactions involve granting permissions, known as “allowances,” to smart contracts to spend your tokens on your behalf. While these allowances are fundamental for seamless interaction with decentralized exchanges (DEXs), lending protocols, NFT marketplaces, and other decentralized applications (dApps), they also represent a potential security vulnerability if not managed diligently. This guide aims to educate Atomic Wallet users on what token allowances are, why they should be revoked, and how to safely revoke them using external tools in conjunction with Atomic Wallet.

Atomic Wallet is a non-custodial multi-currency wallet that provides users with control over their digital assets. While it offers robust features for managing a wide array of cryptocurrencies and interacting with various blockchain networks, direct allowance management within its user interface is not a primary function. Therefore, this guide will focus on leveraging Atomic Wallet’s secure transaction signing capabilities, particularly through WalletConnect, with reputable third-party tools to achieve safe allowance revocation.

Understanding Token Allowances

A token allowance is a permission you grant to a smart contract, allowing it to move a specific amount of your tokens from your wallet. This mechanism is primarily utilized by ERC-20 (Ethereum-based) and similar standard tokens (like BEP-20 on BNB Chain, TRC-20 on Tron, etc.). When you approve a dApp, such as a DEX like Uniswap or PancakeSwap, to trade a certain token, you are essentially setting an allowance. For instance, if you want to swap USDC for ETH, you first need to approve the DEX’s router contract to spend your USDC.

Crucially, these approvals often default to an “infinite” allowance, meaning the contract is authorized to spend any amount of that token from your wallet, up to your current balance, until the allowance is explicitly revoked or decreased. While convenient for repeated interactions, an infinite allowance poses a significant risk. If the smart contract you approved were to be compromised or if you interacted with a malicious contract, an infinite allowance could potentially allow an attacker to drain all your approved tokens.

Why Revoke Token Allowances?

Revoking token allowances is a critical security practice for several reasons:

Mitigating Security Risks: The primary reason to revoke allowances is to reduce your attack surface. If a dApp or smart contract you’ve interacted with becomes compromised, an attacker could exploit existing infinite allowances to transfer your tokens. By revoking or reducing allowances, you limit potential losses.
Protecting Against Malicious Contracts: Unintentionally interacting with a phishing site or a fraudulent dApp can lead to approvals being granted to malicious contracts. Regularly auditing and revoking these allowances ensures that only trusted contracts retain spending permissions.
Maintaining Control Over Assets: Revoking allowances ensures that only you have the ultimate authority over your tokens, enhancing the decentralized ethos of self-custody.
Best Practice for Wallet Hygiene: Just as you would regularly clean out unused applications from your computer, periodically reviewing and revoking unnecessary token allowances is a good practice for maintaining a secure and efficient crypto wallet.

Prerequisites Before You Begin

Before proceeding with the allowance revocation process, ensure you have the following:

Atomic Wallet Installed and Configured: Your Atomic Wallet should be fully set up and contain the assets you wish to manage.
Sufficient Native Blockchain Token for Gas Fees: Revoking an allowance is a transaction on the blockchain and, like any other transaction, requires a small fee (known as “gas”). Ensure you have enough of the native currency of the blockchain (e.g., ETH for Ethereum tokens, BNB for BNB Chain tokens, MATIC for Polygon tokens) in your Atomic Wallet to cover these fees.
Identified Token and Blockchain: Be aware of which specific token’s allowance you want to revoke and on which blockchain network it resides.

Step-by-Step Guide: How to Revoke Allowances Safely with Atomic Wallet

Since Atomic Wallet does not natively feature a dedicated allowance management interface, we will utilize reputable third-party tools that integrate via WalletConnect. WalletConnect allows you to securely connect your Atomic Wallet to dApps without exposing your private keys.

Method 1 (Recommended): Using a Reputable Allowance Revoker Tool via WalletConnect

This method is generally the safest and most user-friendly approach.

Choose a Trusted Allowance Revoker Website:
Navigate to a well-known and reputable allowance management tool. Examples include:
- Revoke.cash: A widely used and trusted platform for managing and revoking token approvals across various networks.
- Etherscan’s Token Approvals: For Ethereum, Etherscan offers a direct tool (e.g., `etherscan.io/tokenapprovalchecker`). Similar tools exist for other chains (e.g., `bscscan.com/tokenapprovalchecker` for BNB Chain).
Always double-check the URL to ensure you are on the legitimate site to avoid phishing scams.
Connect Your Atomic Wallet via WalletConnect:
On the chosen revoker website, look for a “Connect Wallet” button. Select “WalletConnect” as your connection method. This will typically display a QR code.
Scan the QR Code with Atomic Wallet:
Open your Atomic Wallet application.
1. Go to the “Settings” tab (gear icon).
2. Select “WalletConnect.”
3. Tap “New Connection” or the scan icon.
4. Scan the QR code displayed on the allowance revoker website.
Carefully review the connection details within Atomic Wallet to ensure you are connecting to the correct dApp and not a malicious impersonator.
Review and Confirm the Connection:
Atomic Wallet will prompt you to approve the connection. Confirm it. Your wallet address should now be displayed on the allowance revoker website.
Identify and Select the Allowance to Revoke:
The revoker website will display a list of all active allowances associated with your connected wallet address across various tokens and networks.
- Filter by token or scroll through the list to find the specific token approval you wish to revoke.
- Pay attention to the “Spender” (the smart contract address that has the approval) and the “Allowance” amount (often “Unlimited”).
Initiate the Revocation Transaction:
Next to the allowance you want to revoke, you will typically find a “Revoke,” “Deny,” or “Set to 0” button. Click it.
Confirm the Transaction in Atomic Wallet:
Atomic Wallet will prompt you to confirm a transaction. This transaction will set the allowance for the chosen token and spender to zero.
- Review the transaction details carefully: Ensure the transaction is setting the approval amount to “0” and is for the correct token and spender address.
- Note the estimated gas fee.
Approve and Pay Gas:
If all details are correct, confirm the transaction within Atomic Wallet. The gas fee will be deducted from your native blockchain token balance.
Wait for Transaction Confirmation:
The transaction will be broadcast to the blockchain. Wait for it to be confirmed (typically a few seconds to minutes, depending on network congestion). The allowance revoker website should update once the transaction is successful.

Method 2 (Advanced): Revoking via Blockchain Explorers Directly

This method is more technical and involves interacting directly with the token contract on a blockchain explorer. It is generally recommended only for advanced users comfortable with smart contract interactions.

Find the Token Contract Address: Identify the contract address of the token for which you want to revoke an allowance. You can typically find this on CoinGecko, CoinMarketCap, or a blockchain explorer by searching for the token name.
Navigate to the Token Contract on the Blockchain Explorer: Go to the relevant blockchain explorer (e.g., `etherscan.io` for Ethereum, `bscscan.com` for BNB Chain) and paste the token contract address into the search bar.
Access “Write Contract”: On the token contract page, click on the “Contract” tab, then select “Write Contract.”
Connect Your Atomic Wallet: Under the “Write Contract” section, click “Connect to Web3” (or similar button). Choose “WalletConnect” and follow steps 3-4 from Method 1 to connect your Atomic Wallet.
Find the `approve` Function: Scroll down to find the `approve` function (usually function number 1). This function typically requires two parameters: `_spender` (address) and `_value` (uint256).
Input Parameters for Revocation:
- For `_spender` (address), enter the address of the smart contract that currently holds the allowance you wish to revoke. You can find this address on an allowance checker tool (Method 1) or by reviewing your past transactions.
- For `_value` (uint256), enter `0`. This sets the allowance to zero. For tokens with 18 decimal places, `0` is sufficient. If you encounter issues, some interfaces might require `0` followed by 18 zeros (`000000000000000000`) for the full token value representation, but `0` typically works for revocation.
Execute the Transaction: Click the “Write” button next to the `approve` function.
Confirm in Atomic Wallet: Atomic Wallet will prompt you to confirm the transaction. Review all details carefully, ensuring the `value` is 0 and the `spender` address is correct.
Approve and Pay Gas: Confirm the transaction in Atomic Wallet to broadcast it to the blockchain.
Verify Revocation: After the transaction is confirmed, you can use an allowance checker tool (from Method 1) or the “Read Contract” tab on the blockchain explorer (using the `allowance` function with your address and the spender’s address) to verify that the allowance has been successfully revoked (i.e., it shows `0`).

Verifying Successful Revocation

After completing the revocation process, it is crucial to verify that the allowance has indeed been set to zero.

Revisit the allowance revoker website (e.g., revoke.cash) and refresh the page. The revoked allowance should no longer appear or should show an allowance of “0.”
Alternatively, you can manually check the allowance on the blockchain explorer under the “Read Contract” section of the token contract, using the `allowance` function with your wallet address and the spender’s contract address.

Important Considerations and Best Practices

Gas Fees are Unavoidable: Revoking an allowance is a blockchain transaction and always incurs a gas fee. Ensure you have sufficient native tokens.
Prioritize Security: Always verify the URLs of allowance revoker tools and blockchain explorers. Phishing sites are prevalent and can steal your assets.
Never Share Your Seed Phrase/Private Key: Atomic Wallet or any legitimate dApp will never ask for your seed phrase or private keys. Keep them secure and offline.
Regular Allowance Audits: Make it a habit to regularly review and revoke unnecessary allowances, especially after interacting with new or experimental dApps.
Start Small (Optional): If you are unsure, you can initially approve a small, specific amount instead of an infinite allowance when interacting with a new dApp. However, this may lead to more transaction fees if you frequently exceed that limit.

Conclusion

Managing token allowances is an essential aspect of maintaining a secure and responsible presence in the decentralized ecosystem. While Atomic Wallet provides a robust platform for managing your digital assets, leveraging external, trusted tools via WalletConnect is the recommended approach for revoking allowances. By following this guide and adhering to best security practices, you can effectively minimize your risk exposure and ensure greater control over your cryptocurrencies, safeguarding your investments in the dynamic world of DeFi.

Disclaimer: This content is for educational purposes only. Not financial advice.