Unlimited Approval Danger Detector

WHAT IT DOES

Unlimited Approval Danger Detector reads pending approval transaction data from your wallet or a transaction hash, decodes the function (approve, setApprovalForAll, or permit), and extracts the token contract address, spender address, and approval amount or scope. It checks your current wallet balance for the token being approved and determines whether the approval is unlimited or effectively unlimited. When an unlimited approval is detected, the tool issues a clear, urgent warning explaining why you should not sign the transaction and what the spender could do if approved.

HOW TO USE

When your wallet prompts you to sign an approval transaction, copy the transaction hash from your wallet or the requesting dApp. Open the Unlimited Approval Danger Detector, connect your EVM wallet, and paste the transaction hash into the input field. Click "Look up transaction" to fetch the approval details and generate a danger detection. Alternatively, click "Manual entry" to enter the token contract address, spender address, amount, and function type directly. The tool will display the token contract, spender, amount, current balance, and a clear danger banner if an unlimited approval is detected. Review the AI warning to understand the risk, then verify the details in your wallet before signing.

TECHNICAL SECTION — UNLIMITED APPROVAL DETECTION

The tool fetches transaction data from the blockchain using the connected wallet's provider. It decodes the function signature and arguments for approve, setApprovalForAll, and permit calls. For approve and permit, it extracts the spender address and the approval amount. For setApprovalForAll, it extracts the operator address and the boolean approval value. The tool also checks the user's current balance of the token being approved. Unlimited approval is detected when: setApprovalForAll is called with true (unlimited permission for all tokens in the collection), approve is called with the max uint256 value, or the approval amount is more than 10 times the user's current balance (effectively unlimited). When detected, a prominent danger banner is displayed and the AI generates an urgent warning. This approach helps you avoid signing dangerous unlimited approvals.

WHAT IT CANNOT SEE

This tool cannot read the actual intent behind an approval transaction. It cannot determine if the spender address is malicious without an external database. It cannot detect if the approval amount is truly unlimited versus a large but finite number without comparing to the wallet balance. It cannot predict if the spender will use the approval. It cannot detect if the approval has been revoked at the time of the check. It cannot verify if the token contract is legitimate. The user must still verify the transaction details in their wallet before signing. The AI warning is generated from on-chain data and does not constitute financial advice or a security guarantee.

PLEASE NOTE

EVM chains only. Warnings are AI-generated from data the app reads on-chain—always review what you are actually signing in your wallet before approving it. The wallet's own signature prompt remains the final and only protection against unwanted approvals. This tool is read-only; it never sends transactions or signs anything on your behalf.