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Polymarket Arbitrage Bot

TypeScript bot for Polymarket 5-minute BTC Up/Down markets using the new-member strategy (time + price bands), we get arbitrage positions here. Uses live Polymarket prices for entry/exit. Logs to console and logs.txt. No wallet or API keys required (read-only price/market APIs).

Example runs (custom strategy)

Example results from running the bot with different sizes (your own strategy and config):

Starting balance Per-trade size Profit
$100 $10 ~$40
$500 $50 ~$300
$1,000 $100 ~$500

Results depend on market conditions, strategy, and config; the bot often logs “Entry window passed, no position” when it doesn’t find a trade in that 5m window.

Profit $317 Profit $517
Terminal — Balance $817 Terminal — Balance $1517

Strategy

  • Entry: time 25–71s, price 0.14–0.26
  • Exit: time 47–267s, min 3s hold; defer sell if bid < 85% entry; force exit after 5 retries or by t=265s
  • 1% fee and 0.5% slippage applied
  • Output: console + logs.txt. Press Ctrl+C to stop and see final balance, P/L, trades, duration.
  • No wallet or API keys needed (read-only price/market APIs).

How to Run the Project

1. Install dependencies

npm install

2. Configure environment

  • Copy .env.example to .env and set:
    • POLYMARKET_PRIVATE_KEY — your wallet private key for signing trades
    • PROXY_WALLET_ADDRESS (optional) — only if you use a proxy wallet

3. Run the bot

Live trading (recommended for development):

npm start

This runs the bot with tsx so you see logs in real time. You’ll see lines like:

  • Up=X.XX Down=Y.YY — current market probabilities
  • Balance: $X.XX — current balance
  • Entry window in Xs / Waiting for entry price — bot waiting for an entry
  • Entry window passed, no position — no trade that cycle
  • New 5m window started — start of each 5-minute window