Pre-Sign Value Transfer Checker

WHAT IT DOES

Pre-Sign Value Transfer Checker connects to your EVM wallet, reads pending transaction data (recipient, value, data payload, gas price), and decodes the transaction into plain language before you sign it. It identifies ERC-20 transfer and approve function calls, extracts token amounts and contract addresses, and shows exactly what the transaction will do. The tool also provides an AI-generated explanation of the transaction in natural language, making it easier to understand what you're approving.

HOW TO USE

Navigate to any page where you are about to sign a transaction. Open the Pre-Sign Value Transfer Checker, connect your EVM wallet, and either paste a transaction hash or manually enter the recipient address, value, and data. The tool will decode the transaction details and display them in a structured format. Click "Look up transaction" to fetch on-chain data and generate an AI explanation of what the transaction does. Review the AI explanation alongside the raw transaction details, then verify the same details in your wallet's signature prompt before approving.

TECHNICAL SECTION — TRANSACTION DECODING WITH FALLBACK

The tool fetches transaction data from the blockchain using the connected wallet's provider. It decodes the function signature from the transaction data payload, identifying common ERC-20 functions including transfer (0xa9059cbb), approve (0x095ea7b3), and transferFrom (0x23b872dd). For each recognized function, the tool extracts the recipient/spender address and token amount from the calldata using fixed-position decoding. If the function signature is not recognized, the tool still displays the raw data and the recipient address so you can at least see where the transaction is going. The AI layer receives the decoded data and generates a plain-language explanation of what the transaction will do if signed, including the recipient, the amount, and the function being called. This approach works without requiring an external API or proprietary database.

WHAT IT CANNOT SEE

This tool cannot read the actual intent behind a transaction. It cannot determine if the recipient address is a known scam address without an external database. It cannot detect phishing contracts that mimic legitimate addresses. It cannot predict if the token being transferred will retain its value after the transaction. The user must still verify the transaction details in their wallet before signing. The AI explanation is generated from on-chain data and does not constitute financial advice or a security audit.

PLEASE NOTE

EVM chains only. Explanations 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 transactions. This tool is read-only; it never sends transactions or signs anything on your behalf.