Sportsbook Odds Comparison Arbitrage
Finds mispriced sports markets on Polymarket by comparing against real sportsbook odds from ESPN, with reported 5%+ edge signals having 100% win rate.
This scanner identifies arbitrage opportunities by comparing Polymarket prediction market odds with official sportsbook odds scraped from ESPN. It systematically scans NHL, NBA, MLB, and other sports markets, flagging instances where Polymarket prices diverge significantly from the sportsbook consensus. The author reports that NHL markets are systematically overpriced, yielding 10-17% edges, and that signals with a 5%+ edge have achieved a 100% win rate in testing.
The strategy does not require an API key, making it accessible to retail traders. Entry is signaled when the edge exceeds a user-defined threshold, and the bot executes trades on Polymarket to capture the mispricing. Exit is at market resolution or when the edge normalizes.
Implementation is a lightweight Python script with no external dependencies beyond requests and BeautifulSoup for scraping. The repository is free to use and has garnered 2 stars.