Polymarket's Edge, Kalshi's Opportunity
Kalshi and Polymarket have comparable weekly volumes, but their compositions diverge sharply. Kalshi relies on sports (80-90% of volume) with crypto just 3-5%, creating vulnerability through its 50% dependence on Robinhood distribution as prediction market revenue hits 8.5% of Robinhood's total. Polymarket's crypto volume has surged from 5% at start of 2025 to 30% today, driven by 15-minute Up/Down markets that grew from 5% to 60% of crypto volume, where one address accounts for 52% of volume through systematic mint-and-distribute liquidity seeding that enables arbitrage at scale. Kalshi's newly launched 15-minute crypto contracts show demand signals at $40M weekly volume, but Polymarket's edge may be structural liquidity design rather than product format alone.