Frontrunner Protector

WHAT IT DOES

Frontrunner Protector gives DeFi traders and protocol users real-time detection of front-running attacks on their transactions. It reads live on-chain and mempool data including pending transactions, transaction simulation data, gas price oracles, block state, historical transaction patterns, and DEX pool state. You can analyze any transaction hash to determine if it was front-run, identify the front-running transaction, assess confidence levels, and receive actionable protection recommendations. The tool shows you in real time whether your transaction was targeted, how much gas premium the front-runner paid, recommended slippage tolerance, and gas price recommendations—so you can avoid becoming a victim of front-running bots.

HOW TO USE

Connect your EVM wallet (optional—the tool can work in read-only mode). Enter a transaction hash to analyze for front-running activity. Optionally provide a router or DEX address for enhanced detection. Click "Detect front-running" to fetch current data from the chain and run detection heuristics. The tool displays the transaction hash, detection result (Yes/No), confidence level percentage, front-run transaction hash, front-run gas price, estimated slippage, recommended slippage tolerance, and gas price recommendation. A visual dashboard shows the confidence score, gas premium percentage, and block transaction count. The "Simulate protection" feature provides guidance on optimal gas price and slippage settings to avoid future front-running.

TECHNICAL APPROACH

This tool queries live blockchain and mempool data using ethers v5.7.2. It fetches transaction data and receipts using getTransaction() and getTransactionReceipt(), and retrieves full block data with getBlock() to access all transactions in the block. The tool identifies the position of the target transaction within the block and examines transactions immediately before it. It detects front-running by checking if a preceding transaction has a higher gas price (indicating a bot paying more to land first) and if both transactions interact with the same DEX or pool. It scans transaction calldata for common swap signatures like 0x38ed1739, 0x7ff36ab5, 0x18cbafe5, and 0x5c11d795. The tool calculates gas premium percentages, estimates optimal slippage, and provides protection recommendations based on current network conditions. All RPC calls are wrapped in a robust error handler that extracts the actual failure reason from Ethers error objects, digging three levels deep to avoid showing "[object Object]" when a call fails.

WHAT IT CANNOT SEE

This tool cannot prevent front-running through private mempools or Flashbots. It cannot guarantee protection against all front-running attempts. It cannot detect front-running that occurs through multiple intermediary transactions. It cannot see transactions that are not included in the public block data. It cannot predict future front-running attacks before they happen. It cannot guarantee that the confidence score is always accurate or that the protection recommendations will prevent all attacks. The tool provides detection and recommendations based on available data, but it does not guarantee that a transaction will not be front-run after analysis.

PLEASE NOTE

This tool supports EVM‑compatible chains only (Ethereum, Goerli, Sepolia, Arbitrum, Optimism, Polygon). Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, and XRP are not supported. The tool is read‑only and does not require signing transactions—connect is optional. No contract addresses are hardcoded; you paste the transactions you are analyzing. The tool is free and open under the BotGentz PLAYBOOK‑C specification.