rustic-bot

byEast

Act as a Principal MEV Engineer, Quant Researcher, and Elite Smart Contract Security Auditor specializing in High-Frequency Trading (HFT) on EVM chains. Architect a hyper-optimized, low-latency, front-run-protected flash loan arbitrage framework engineered exclusively for the Polygon (MATIC/POL) Mainnet. Provide a complete, production-ready, bulletproof implementation across the following three files. Do not use placeholders, truncated code, shorthand syntax, or "// TODO" comments. --- ### 1. FlashLoanArbitrage.sol Write a highly optimized, gas-minimized Solidity smart contract (compiler `0.8.24` or higher with EVM version `shanghai` or `cancun`) that enforces the following requirements: * **Core Architecture:** Inherit from Aave V3’s `FlashLoanSimpleReceiverBase` using `IPoolAddressesProvider`. Utilize OpenZeppelin's `Ownable2Step` (for secure ownership transfer) and a custom, gas-efficient reentrancy guard. * **Low-Gas Execution Routing:** Implement an ultra-streamlined `executeOperation` that decodes execution payloads dynamically. It must support arbitrary multi-hop routing combining UniswapV2 and UniswapV3 pools (QuickSwap and SushiSwap variants). Use low-level assembly (`p_copy`, `calldatacopy`) where appropriate to minimize gas overhead during token swaps. * **Reorg & Expiry Protection:** Accept a `deadline` or `targetBlockNumber` parameter passed from the bot. If the transaction is mined after the `targetBlockNumber` (indicating a Polygon block reorg or mempool delay), the contract must immediately revert to prevent executing on stale, toxic prices. * **Strict Validation & Event Accounting:** * Validate that `msg.sender == address(POOL)`. * Ensure the final balance covers `amount + premium` + `minProfit`. Revert explicitly on failure to save gas via state rollback. * Emit a structured event: `event ArbitrageSuccess(address indexed token, uint256 profit, uint256 gasUsed)`. * **Capital Recovery:** Include an emergency `rescueFunds` function restricted to the owner via `onlyOwner`. ### 2. bot.js (Ethers.js v6) Write a high-performance Node.js execution engine built for speed and reliability: * **Atomic State Fetching (Multicall3):** Do not query pools individually. The bot must utilize the `Multicall3` contract (`0xcA11bde05977b3631167028862bE2a173976CA11`) to batch all `getAmountsOut` or slot0/liquidity calls into a single RPC query per block. * **Concurrency & Block-Tag Locking:** Listen to new blocks via WebSockets (`provider.on('block')`). For every new block, lock queries to that exact block number to prevent race conditions or reading desynchronized node states. * **Pre-Execution Simulation (`eth_call`):** Prior to broadcasting, execute a local simulation using `provider.call()` or `provider.estimateGas()`. Evaluate the exact return data. If the simulation fails or the projected net profit fails to clear current gas costs, drop the transaction instantly. * **MEV Relay Integration (FastLane / Flashbots):** Build payload submission logic that targets Polygon private relays (e.g., FastLane Framework or Flashbots/Polygon Builders) utilizing custom headers and signature verification to guarantee front-running and sandwich protection. ### 3. hardhat.config.js Provide an enterprise-ready Hardhat configuration file: * **Network Tuning:** Define Polygon Mainnet with optimized `timeout`, `count`, and `pollingInterval` configs matching a high-performance private node. * **Aggressive EIP-1559 Pricing:** Implement a dynamic gas pricing algorithm config framework. Ensure `maxPriorityFeePerGas` is explicitly calculated to outbid competitive public searchers during network congestion spikes, using a safe multiplier over the base fee. * **Compiler Optimization:** Enable the Solidity compiler optimizer with `runs: 999999` and enable `viaIR` (Internal Representation) optimization to ensure minimal runtime bytecode gas costs. Format the complete output cleanly using individual Markdown code blocks for each file, accompanied by a checklist of exact production dependencies and network addresses.