trade-of-economics-in-warsaw/market-sniping-trading-bot

This is a TypeScript trading bot for Polymarket, aimed at the platform's 5 minute Up or Down prediction markets on Bitcoin, Ethereum, Solana, and XRP prices. Rather than being a simple wrapper around the trading API, it includes market discovery, batch order placement, balance checking, and configurable exit rules, so it can run as a complete trading loop out of the box, or be extended with custom logic. The default strategy places limit buy orders on both the Up and Down side of a market at the same time, right when each 5 minute period starts, at a fixed price such as 45 cents. If only one side of that pair fills and the price on the other, unfilled side crosses a set trigger, such as 80 cents, the bot places a limit sell on the side that did fill, aiming for a target price like 85 cents. By default there is no hedge trade on the unfilled side, no stop loss, and no automatic redemption when a market closes, only the period start limit orders and the optional trigger based sell. The README describes the bot's structure as four parts: a monitor that discovers markets by their slug and takes snapshots, a main loop that decides when to place limit buys and when to check for the sell trigger, a trader component that actually sends orders and checks balances, and the underlying Polymarket CLOB and Gamma APIs it talks to. Developers can extend it into a signal based bot by swapping out the default sell trigger for their own logic, such as momentum indicators or external data feeds, without touching the order execution code. To run it, you need Node.js 20.10 or newer, a config file with your Polymarket wallet's private key, and depending on your wallet setup, a proxy wallet address and matching signature type. It supports both a simulation mode for testing and a live trading mode, and the README is explicit that traders should use their own wallet's private key for order signing, not the separate Builder attribution key from Polymarket's settings page. Collateral for trades is Polymarket's own USD token, called pUSD.