Building a free Polymarket screener: how I turned 13,963 markets into a single scannable page (opens in new tab)

Polymarket has thousands of markets. Their UI is built for depth on a single market — bet slip, orderbook, charts — not for scanning across the universe. If you want to ask "what dropped 20pp overnight" or "which crypto markets are sub-20¢ with real volume," there's no built-in view. So I built one. It's free, it's static, it rebuilds from the public Gamma API every few hours, and the source is on GitHub. This post is how it works. The data layer The Polymarket Gamma API ( is paginated and un...