How I built a real-time whale tracker for Polymarket using Node.js and a CLI

The 2026 World Cup has $3.89 billion bet on it across Polymarket. That's not retail money — that's whales.

I built WhaleTrack to track exactly what those big wallets are doing. Here's the stack:

Backend: Node.js server fetching live data via Bullpen CLI

Frontend: Vanilla JS, real-time updates

Data: Polymarket CLOB API via Bullpen