Kalshi vs Polymarket Sports and Politics

This is becoming a two horse race where category mix matters more than raw headline volume. Kalshi has won the biggest everyday use case, sports, because U.S. users can fund accounts with dollars and trade legally nationwide, while Polymarket still owns politics where crypto native, global liquidity and fast market creation matter more. The result is similar weekly scale built on very different engines.

• Sports is the better retention business because games resolve in hours, not months, so the same bankroll can be reused again and again. That is why Kalshi could do about $1.1B in monthly sports volume versus Polymarket at about $350M, even while Polymarket stayed ahead in politics at about $350M versus Kalshi near $75M.
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• The product differences are concrete. Kalshi runs a regulated U.S. exchange with bank deposits, KYC, and taker fees around 1% to 1.5%. Polymarket runs on crypto rails with zero trading fees, on chain execution, and offshore access. In practice that makes Kalshi easier for mainstream U.S. sports users, and Polymarket better suited to global, always on political and crypto trading.
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• League partnerships show where the market is heading. The NHL gave both platforms official data and branding rights in October 2025, and MLS made Polymarket an official U.S. partner in January 2026. That shifts prediction markets from fringe election speculation toward a normalized sports distribution channel, closer to exchange infrastructure than a standalone betting app.
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The next phase is a fight to become the default liquidity layer that brokers, sportsbooks, media apps, and trading apps plug into. If Kalshi keeps compounding in sports and Polymarket reenters the U.S. with regulated rails while preserving its global crypto liquidity, the category will look less like niche betting sites and more like a new exchange layer for real world events.