How to Revoke Dangerous Approvals (Revoke.cash Guide)
When you interact with DeFi, NFTs, or airdrop tasks, you often give smart contracts permission to spend your tokens. This is called a token approval.
If you approve a malicious contract—or even a trusted contract is later hacked—your funds may be drained without you sending a transaction yourself.
This guide teaches you how to check and revoke approvals safely using Revoke.cash.
1. What Is a Token Approval?
A token approval allows a smart contract to:
- Spend your tokens
- Move tokens on your behalf
- Transfer tokens from your wallet
This is required for:
- Swapping tokens
- Adding liquidity
- Minting NFTs
- Using dApps
2. Why Approvals Can Be Dangerous
Common risks:
❌ Malicious contracts
❌ Project hacks
❌ Unlimited approvals (unlimited token spending)
❌ Fake airdrop pages
❌ Fake mint websites
If a malicious actor has approval, they can drain your tokens without your signature.
3. How to Check Your Active Approvals
Step 1
Go to 👉 https://revoke.cash
Step 2
Connect your wallet.
Step 3
Select your network (ETH, BSC, Polygon, Arbitrum, Solana via Solscan link, etc.)
Step 4
View all active approvals:
- Token approvals
- NFT approvals
- Unlimited allowances
4. How to Revoke Approvals
Step 1 — Find the risky approval
Look for:
- Unlimited spend amounts
- Unknown contracts
- Contracts from old airdrop tasks
- Apps you no longer use
Step 2 — Click Revoke
Step 3 — Confirm the transaction in your wallet
You must pay a small gas fee.
Once revoked:
- The contract can no longer move your tokens
- Your wallet is safer
5. When Should You Revoke Approvals?
✔ After airdrop tasks
Many tasks ask you to approve tokens.
✔ After using new or unknown dApps
Especially when launched recently.
✔ After NFT mints
Many NFT mint sites require approvals.
✔ Before storing tokens long-term
Always revoke before holding tokens for months.
✔ If a project seems suspicious
Do not wait — revoke immediately.
6. Advanced Safety Tips
✔ Use “Limited Approvals” when possible
Some platforms allow exact spend approvals.
✔ Separate wallets
Use:
- One wallet for DeFi
- One wallet for airdrops
- One for NFT mints
- One cold wallet for savings
✔ Never approve unrestricted access on unknown sites
Many scams depend on unlimited approvals.
7. Final Takeaway
Token approvals are necessary—but dangerous if ignored.
Revoke.cash is one of the most important safety tools for all crypto users.
Follow these practices:
- Review approvals regularly
- Revoke old DeFi or NFT permissions
- Never keep unlimited approvals long term
- Always double-check new dApps
A few minutes of maintenance can prevent a complete wallet drain.