Halftone engraving of an archer drawing a bow at a breaching whale

Cross-venue signal engine

Watch the whales surface.

Harpoon watches Kalshi and Polymarket in real time — surfacing large whale trades and cross-venue price gaps the moment they print, so you see where the money moves as it moves.

🔔 Get whale alerts on Telegram Get early access

Free · whales ≥ $50k · /stop anytime  ·  paper mode live