Polymarket Faces Sportsbook Competition

The key shift is that prediction markets are no longer a weird side door into sports betting, they are becoming a mainstream product category with serious incumbents. Polymarket first won by being fast, cheap, and global, but sports pulled in Kalshi, then sportsbooks and exchange operators with licenses, distribution, and existing customer bases. That changes the game from proving demand to fighting for liquidity, regulation, and default placement inside larger apps.

• Kalshi showed that sports could be the volume engine, not politics. By October and November 2025, sports made up roughly 90% of Kalshi volume, with monthly sports volume above $4B, and Polymarket and Kalshi were trading volume leadership week to week. Once that happened, every sportsbook had a clear proof point that event contracts could matter at scale.
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• Traditional operators bring an unfair distribution advantage. DraftKings bought Railbird to launch prediction markets in the coming months, while FanDuel and CME launched FanDuel Predicts with sports contracts in non online sports betting states. These companies already have sportsbook apps, payment rails, KYC systems, and millions of sports users to cross sell into prediction products.
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• This market is fragmenting by product and channel, not just by brand. Polymarket remains strongest in politics and crypto native trading, Kalshi is strongest in regulated U.S. sports, and newer entrants like Fanatics are plugging prediction markets into broader fan commerce and betting stacks. That creates a more crowded front end, even if liquidity still concentrates into a few core venues underneath.
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The next phase is a land grab for bundled distribution. The winners will be the platforms that make prediction contracts feel like a native tab inside sports, trading, and crypto apps, while also concentrating enough order flow to keep markets tight and trustworthy. Polymarket still has brand and product speed, but the market is now moving toward bundled giants with licenses, users, and balance sheets.