What is an unlimited token approval?

An unlimited approval gives a spender contract permission to move a very large amount of your token. This can be convenient, but it can also increase risk if the contract is compromised.

Can I revoke token approval with this tool?

Yes. If you connect a compatible wallet and you are checking your own wallet address, you can send an on-chain approve(spender, 0) transaction to revoke access.

Which chains are supported?

This tool supports Ethereum, Base, Arbitrum, Optimism, and BNB Chain.

Wallet Approval Checker | ERC-20 Token Allowance Checker

Check Token Approval

Enter a wallet address, token contract, and spender contract to check the ERC-20 allowance on a supported chain.

No wallet connected.

Connect if you want to revoke access directly from this page.

Chain

Common spender

Wallet address

Token contract address

Spender contract address

This tool checks ERC-20 allowance for a specific wallet, token, and spender combination. It does not automatically scan every approval in a wallet.

READY

Enter addresses to check token approval.

Allowances are read directly from the token contract.

Token —

Symbol —

Formatted allowance —

Raw allowance —

Risk —

Spender —

Popular Spender Addresses

Choose a preset or paste your own spender contract address.

Permit2

0x000000000022D473030F116dDEE9F6B43aC78BA3

1inch Router v5

0x1111111254EEB25477B68fb85Ed929f73A960582

Uniswap V2 Router

0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D

PancakeSwap V2 Router

0x10ED43C718714eb63d5aA57B78B54704E256024E

How revoke works

Revoke sends an on-chain ERC-20 transaction: approve(spender, 0). Your wallet will ask for confirmation, and network gas fees apply.

Important note

Revoke is only enabled when your connected wallet matches the wallet address in the form.

What Is a Wallet Approval Checker?

A wallet approval checker helps you inspect ERC-20 token allowances. When you interact with a DEX, bridge, staking app, or DeFi protocol, you often approve a spender contract to move tokens from your wallet.

Those approvals can remain active long after you stop using the app. In some cases, users grant very large or unlimited approvals, which can create extra risk if a contract is exploited or a malicious app is used.

This InstantQR tool lets you check an approval for a specific wallet, token, and spender across supported EVM chains, then optionally revoke that access with your connected wallet.

How to Use This ERC-20 Allowance Checker

Step 1: Choose a chain such as Ethereum, Base, Arbitrum, Optimism, or BNB Chain.

Step 2: Enter the wallet address you want to inspect.

Step 3: Paste the token contract address.

Step 4: Paste the spender contract address, or choose a common preset.

Step 5: Click Check Approval to read the allowance directly from the token contract.

Step 6: If your connected wallet is the same wallet address and the allowance is not zero, click Revoke Approval.

Frequently Asked Questions

What is an ERC-20 allowance?

An ERC-20 allowance is the amount of tokens a wallet has approved a spender contract to use on its behalf.

What counts as an unlimited approval?

In practice, very large values close to the maximum uint256 value are treated as unlimited approvals. This tool flags very large allowances as elevated risk.

Why is revoke not scanning all my approvals automatically?

This page is designed as a fast client-side checker for a specific token and spender combination. A full wallet-wide approval scanner usually requires a backend indexer or external API.

Does this tool support native ETH or BNB?

No. Native coins do not use ERC-20 approvals. This checker is for ERC-20 token contracts only.

Does this tool store my wallet data?

No. The page runs in your browser and directly reads contract data from supported public RPC endpoints.