emerald-bot
East LosAct as a Principal MEV (Maximal Extractable Value) R&D Engineer and a Senior Solidity Security Auditor specializing in low-latency EVM arbitrage systems on high-throughput networks. I want to build a highly competitive, production-grade cross-DEX flash loan arbitrage bot for Polygon Mainnet. The architecture must be heavily inspired by the core structural philosophy of the 'pmuens/midas' framework but radically modernized to compete in today's cutthroat MEV environment. Generate the code base according to the exact architectural specifications, structural parameters, and execution protocols outlined below. 1. SYSTEM PARAMETERS & ENVIRONMENTAL BOUNDS Network: Polygon Mainnet (Gas asset: POL / Base trading asset: Native USDC) Flash Loan Source: Balancer V2 Vault (Address: 0xBA12222222228d8Ba445958a75a0704d566BF2C8) for 0% fee asset borrowing. Target DEX Liquidity Pools: QuickSwap V2 (Uniswap V2 Clone) and SushiSwap V2. Development Framework: Foundry (Solidity ^0.8.20) for the smart contracts; TypeScript (ethers.js v6) for the off-chain orchestration engine. 2. CORE COMPONENTS REQUIRED COMPONENT A: The Smart Contract ('MidasPolygonEngine.sol') Write a highly gas-optimized, production-ready Solidity contract that implements the Balancer V2 Flash Loan receiver interface ('IFlashLoanRecipient'). Gas Optimization Rules: Optimize for bytecode compactness and minimal runtime overhead. Use custom errors instead of string require statements. Use 'unchecked {}' blocks for arithmetic loops and balance changes where overflow is mathematically impossible. Avoid high-level abstractions like routers. Direct Pool Routing: The contract must execute swaps by calling the liquidity pool pair contracts directly via '.swap()' instead of using high-level router contracts (like QuickSwapRouter). Strict Execution Safety: Implement a bulletproof safeguard. At the end of the callback function—immediately before the Balancer Vault pulls back the loan principal—the contract must verify that the ending balance of the profit token (USDC) is greater than the starting balance plus an off-chain parameterized 'minProfitThreshold'. If this condition fails, the contract must explicitly revert the entire transaction transaction string to prevent capital loss. Access Control: Secure the trigger mechanism so that only the owner's monitoring bot address can call the execution entry point, completely preventing external actors from frontrunning or hijacking the execution. COMPONENT B: The Node Engine ('monitor.ts') Write a highly optimized TypeScript orchestration script that acts as the real-time data ingestion and calculations hub. Event-Driven Architecture: Do not use interval JSON-RPC block polling. Use a high-fidelity WebSocket provider ('wss://') to subscribe directly to the 'Sync(uint112,uint112)' or 'Swap' event logs emitted directly by the target QuickSwap and SushiSwap pair contracts. Math Engine (Optimal Input Calculation): Implement the standard AMM optimal input amount formula for two constant-product (x * y = k) Uniswap V2 pairs to calculate the mathematically perfect input amount (A_in) that maximizes arbitrage yield given the exact reserves extracted from the latest 'Sync' logs. The equation must natively factor in the standard 0.3% fee modifier (gamma = 0.997). MEV Guardrail & Private Relaying: Structure the transaction submission logic to bypass the public Polygon mempool entirely to prevent frontrunning and sandwich attacks. Integrate the transaction dispatch code with the FastLane Protocol API or Flashbots Polygon Builder endpoint, sending the execution payload as a private bundle.
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System Requirements
emerald-bot
Introduction
The emerald-bot project aims to develop a highly competitive, production-grade cross-DEX flash loan arbitrage bot for the Polygon Mainnet. This bot will be inspired by the core structural philosophy of the 'pmuens/midas' framework but will be modernized to excel in the current MEV (Maximal Extractable Value) environment.
System Overview
The emerald-bot is designed to execute flash loan arbitrage strategies across decentralized exchanges (DEXs) on the Polygon Mainnet. It leverages the Balancer V2 Vault for flash loans and targets liquidity pools on QuickSwap V2 and SushiSwap V2. The system is built using Solidity for smart contracts and TypeScript for off-chain orchestration, ensuring optimal performance and security.
Functional Requirements
- As a Developer, I should be able to deploy a gas-optimized Solidity contract that implements the Balancer V2 Flash Loan receiver interface.
- As a Developer, I should be able to execute swaps by calling liquidity pool pair contracts directly.
- As a Developer, I should be able to implement a safeguard that verifies the ending balance of the profit token is greater than the starting balance plus a 'minProfitThreshold'.
- As a Developer, I should be able to secure the execution entry point so that only the owner's monitoring bot address can trigger it.
- As a Developer, I should be able to write a TypeScript orchestration script that uses a WebSocket provider for real-time data ingestion.
- As a Developer, I should be able to calculate the optimal input amount using the AMM formula for Uniswap V2 pairs.
- As a Developer, I should be able to structure transaction submission logic to bypass the public Polygon mempool.
User Personas
- Developer: Responsible for deploying and maintaining the smart contract and orchestration script. Ensures the system is optimized for performance and security.
- Owner: The entity that owns the bot and has exclusive access to trigger the execution entry point.
Core User Flows
- Developer deploys the smart contract on Polygon Mainnet.
- Developer configures the TypeScript orchestration script to subscribe to DEX event logs.
- Developer calculates the optimal input amount for arbitrage using real-time data.
- Owner triggers the execution entry point via the monitoring bot.
- Smart contract executes the flash loan and swaps, verifying profit conditions.
- Transaction is submitted as a private bundle to prevent frontrunning.
Visuals Colors and Theme
- primary: #2E8B57 (Emerald Green)
- primary_light: #66CDAA (Medium Aquamarine)
- secondary: #FF6347 (Tomato)
- accent: #FFD700 (Gold)
- highlight: #FFA500 (Orange)
- bg: #F5FFFA (Mint Cream)
- surface: rgba(46, 139, 87, 0.8)
- text: #2F4F4F (Dark Slate Gray)
- text_muted: #708090 (Slate Gray)
- border: rgba(46, 139, 87, 0.2)
Signature Design Concept
The homepage of the emerald-bot will feature an interactive 3D network map using @react-three/fiber and @react-three/drei. Users can navigate through a virtual representation of the Polygon Mainnet, with nodes representing different DEXs and liquidity pools. Clicking on a node will display real-time data and potential arbitrage opportunities. The map will be dynamic, with nodes pulsing to indicate activity and connections between them visualized as flowing lines. This immersive experience will make the complex world of MEV and arbitrage accessible and engaging.
Interaction Model & Motion Direction
The landing page will employ a "parallax" interaction model, with layered depth effects as users scroll. The 3D network map will be the focal point, with additional content sections revealing themselves through smooth scroll-triggered animations. This approach will create a visually rich and engaging first impression, suitable for a cutting-edge financial tool like emerald-bot.
Non-Functional Requirements
- The system must operate with minimal latency to capitalize on arbitrage opportunities.
- The smart contract must be highly gas-efficient to reduce transaction costs.
- The orchestration script must handle real-time data ingestion without lag.
Tech Stack
- Frontend: React for Web
- Backend: Solidity for smart contracts, TypeScript for orchestration
- Database: Not specified
- AI Models: Not applicable
- AI Tools: Not applicable
- Local Orchestration: Docker, docker-compose
- Server Side Orchestration: Kubernetes
Assumptions and Constraints
- The system assumes access to the Polygon Mainnet and its associated DEXs.
- The system is constrained by the gas fees and transaction speeds of the Polygon network.
- The flash loan source is limited to the Balancer V2 Vault.
Glossary
- MEV (Maximal Extractable Value): The maximum value that can be extracted from block production in excess of the standard block reward and gas fees.
- DEX (Decentralized Exchange): A peer-to-peer marketplace where transactions occur directly between crypto traders.
- Flash Loan: A type of uncollateralized loan in DeFi that must be borrowed and repaid within a single transaction.
- Polygon Mainnet: A protocol and framework for building and connecting Ethereum-compatible blockchain networks.
- Smart Contract: A self-executing contract with the terms of the agreement directly written into code.
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