Polymarket Trading Bot (TypeScript)

At each 15-minute market start, places limit buys for BTC (and optionally ETH, Solana, XRP) Up/Down at a fixed price (default $0.45).

Requirements

• Node.js >= 18
• config.json with Polymarket private_key (and optional API creds)

Setup

npm install
cp config.json.example config.json   # or copy from Rust project
# Edit config.json: set polymarket.private_key (hex, with or without 0x)

Usage

• Simulation (default) – no real orders, logs what would be placed:

  npm run dev
  # or
  npx tsx src/main-dual-limit-045.ts

• Production – place real limit orders:

  npx tsx src/main-dual-limit-045.ts --no-simulation

• Config path:

  npx tsx src/main-dual-limit-045.ts -c /path/to/config.json

Logging

• Console: colored in development, JSON lines when NODE_ENV=production.
• Levels: LOG_LEVEL=debug|info|warn|error (default info). Use LOG_DEBUG=true to force debug.
• File (optional): set LOG_FILE=true, optional LOG_FILE_PATH=logs/bot.log, LOG_ROTATION=1H|1D|1W, LOG_MAX_FILES=7.
• Slack / Discord / Telegram (optional): set SLACK_WEBHOOK_URL, DISCORD_WEBHOOK_URL, or TELEGRAM_BOT_TOKEN + TELEGRAM_CHAT_ID. Hook minimum level: MB_LOG_HOOK_LEVEL (default error).

.env is loaded automatically via dotenv. See .env.logging.example.

In code: import log from "./logger.js" then log.info(), log.warn(), log.error(), log.debug(), or import { tag } from "./logger.js" for scoped loggers.

Config

Same shape as the Rust bot:

• polymarket.gamma_api_url, polymarket.clob_api_url – API base URLs
• polymarket.private_key – EOA private key (hex)
• polymarket.proxy_wallet_address – optional proxy/Magic wallet
• trading.dual_limit_price – limit price (default 0.45)
• trading.dual_limit_shares – optional fixed shares per order
• trading.enable_eth_trading, enable_solana_trading, enable_xrp_trading – enable extra markets

Project layout

• src/config.ts – load config, parse CLI args
• src/types.ts – Market, Token, BuyOpportunity, MarketSnapshot
• src/api.ts – Gamma API (market by slug), CLOB order book
• src/clob.ts – CLOB client (ethers + @polymarket/clob-client), place limit order
• src/monitor.ts – fetch snapshot (prices, time remaining)
• src/logger.ts – @slackgram/logger setup (env, file, webhooks)
• src/trader.ts – hasActivePosition, executeLimitBuy
• src/main-dual-limit-045.ts – discover markets, monitor loop, place limit orders at period start

Build

npm run build
node dist/main-dual-limit-045.js