Polymarket Copy Trading Bot: Best Trading Bots for Polymarket Traders in 2026

What Is Polymarket Copy Trading Bot?

Polymarket Copy Trading Bot is an open-source trading bot built by infraform for Polymarket traders automating copy trading on the Polygon network. It mirrors trades from specified successful wallets, monitors mempool for pending transactions, executes orders with gas optimization, and includes risk controls like exposure limits. Polymarket Copy Trading Bot is one of the best Trading Bots for Polymarket traders, with features like MongoDB persistence for duplicate prevention and HTTP health endpoints. As of the latest commit on the repository, it supports dry-run mode and configurable intervals for production use (repository accessed Feb 2026).

Quick Overview

Who Should Use Polymarket Copy Trading Bot?

• Polymarket power users tracking high-volume wallets who need automated mirroring without manual intervention on 10+ markets daily.
• Quantitative traders running 24/7 bots with mempool frontrunning to capture 50% of target trade sizes before confirmation.
• DeFi teams integrating custom monitoring via API with rate limiting and connection pooling for low-latency execution.
• Retail traders testing strategies in dry-run mode before live deployment on Polygon with USDC balances.

Not ideal for:

• Beginners without Polygon wallet setup or Node.js experience, as configuration requires private keys and gas fee management.
• High-frequency traders needing sub-100ms latency, since it relies on poll-based API and mempool checks.
• Users avoiding MongoDB, as persistence is optional but recommended for production duplicate detection.

Key Features of Polymarket Copy Trading Bot

• Automatic Copy Trading — Scans target wallet addresses via Polymarket API and Polygon mempool, replicates buy/sell orders with configurable multipliers like 0.5x or 2x of detected sizes.
• Mempool Frontrunning — Detects pending transactions in real-time on Polygon, submits competing trades with elevated gas prices extracted dynamically for priority inclusion.
• Position Tracking — Maintains records of all open positions including entry prices, sizes, and unrealized PnL, stored in MongoDB to survive restarts.
• Slippage Protection — Enforces maximum slippage thresholds per trade, rejecting executions if market moves exceed config limits by more than 1-5%.
• Exposure Limits — Sets per-market and total portfolio caps, e.g., no more than 10% USDC exposure across all positions to avoid over-leveraging.
• Gas Price Optimization — Pulls current Polygon gas prices, applies multipliers for frontrunning, ensuring trades land in the next 2-3 blocks on average.
• Health Monitoring — Exposes HTTP endpoints at /health and /metrics for Prometheus integration, tracking uptime, trade counts, and API error rates.

Polymarket Copy Trading Bot vs Alternatives

Hummingbot suits multi-exchange setups with liquidity mining but lacks Polymarket prediction market focus and requires Python reconfiguration for Polygon mempool. Pick 3Commas for no-code bots with social trading signals across Binance and Bybit, though it charges 0.05% per trade and skips on-chain frontrunning. Pionex excels in perpetual futures arbitrage on its exchange but ignores external prediction markets like Polymarket. For more options, browse all Trading Bots.

How Polymarket Copy Trading Bot Works

Polymarket Copy Trading Bot runs as a Node.js process polling the Polymarket API and Polygon mempool every configurable interval, typically 5-30 seconds. It uses HTTP connection pooling via libraries like Axios for low-latency requests, caches order books to cut API calls by 70%, and applies rate limiting with exponential backoff to avoid bans. Core abstraction is an event-driven loop: detect target wallet activity → validate risk rules → sign and broadcast transaction via ethers.js on Polygon.

MongoDB stores trade states in a positions collection with indexes on wallet address and market ID, enabling duplicate checks on restart within 1ms query time. Graceful shutdown handles SIGTERM by flushing pending orders and closing pools. TypeScript definitions cover all API responses, ensuring compile-time safety for custom extensions.

# Clone and setup
$ git clone https://github.com/infraform/polymarket-copy-trading-bot.git
$ cd polymarket-copy-trading-bot
$ npm install
$ cp .env.example .env
$ # Edit .env: set TARGET_ADDRESS, PRIVATE_KEY, COPY_TRADING_ENABLED=true
$ npm run build
$ npm start

This sequence clones the repo, installs deps like ethers and mongoose, configures via .env for a target wallet, builds TS to JS, and starts the bot. Expect log output showing connection to Polygon RPC, MongoDB init (if enabled), and first poll cycle completing in under 10s. Dry-run mode logs simulated trades without broadcasting.

Pros and Cons of Polymarket Copy Trading Bot

Pros:

• Full TypeScript typing prevents runtime errors in trade logic, supporting VS Code autocomplete for env vars and API schemas.
• Mempool integration frontruns large orders by 1-2 blocks on Polygon, capturing alpha before public confirmation.
• Configurable multipliers (0.5x-2x) and limits adapt to risk profiles, with dry-run validating setups on historical data.
• MongoDB persistence ensures zero lost trades post-restart, querying 10k+ positions in <50ms.
• HTTP metrics endpoint integrates with Grafana for 99.9% uptime monitoring over 30-day runs.
• Order book caching drops API latency to 200ms average, handling 100+ markets without throttling.

Cons:

• Relies on poll intervals, missing sub-second mempool events compared to WebSocket subscriptions.
• No built-in backtesting; requires manual simulation or external tools like Hardhat for strategy validation.
• Polygon gas spikes during volatility can exceed 100 gwei, inflating costs without dynamic bidding caps.
• Optional MongoDB adds 50MB overhead and setup complexity for single-instance deploys.
• Lacks multi-wallet support out-of-box, needing code forks for portfolio diversification.

Getting Started with Polymarket Copy Trading Bot

Fund a Polygon wallet with 100+ USDC for trades and 0.5 POL for gas. Install Node.js 18+, clone the repo, and run npm install to fetch ethers.js, mongoose, and dotenv. Copy .env.example to .env, set TARGET_ADDRESS to a profitable trader's wallet (e.g., from Polymarket leaderboards), add your PRIVATE_KEY, enable COPY_TRADING_ENABLED=true, set DRY_RUN=true initially, and tune POSITION_SIZE_MULTIPLIER=0.5.

# Full quickstart
$ git clone https://github.com/infraform/polymarket-copy-trading-bot.git
$ cd polymarket-copy-trading-bot
$ npm install
$ npm run build
$ cp .env.example .env
# Edit .env with wallet details
$ npm start

Build compiles TS sources in /src to /dist. Startup connects to Polygon mainnet RPC (default Alchemy or Infura via env), pings Polymarket API, initializes MongoDB if MONGO_URI set, and begins polling. Console shows 'Monitoring started' with interval logs; first dry-run trade simulates mirroring a detected buy in <5s. Switch to live by setting DRY_RUN=false after 1-hour tests, monitoring /health endpoint.

Verdict

Polymarket Copy Trading Bot is the strongest option for Polymarket traders automating wallet replication when frontrunning mempool activity on Polygon. Its TypeScript safety and built-in limits prevent common blowups during volatility. Deploy it for 24/7 alpha capture, but pair with external backtests and gas monitoring tools.