I connected to a public WebSocket feed and found mispriced tokens on Polymarket

The author discovered a ~55-second price delay between Chainlink oracle updates and Polymarket's order book for 15-minute crypto markets, then built a 1,400-line Python asyncio bot to exploit mispriced tokens. Key engineering challenges included zombie WebSocket connections with silent data loss and pre-flight credential verification. A backtest across 8,876 markets and 5,017 trades showed a 61.4% win rate on BTC, ETH, XRP, and SOL.