Polymarket Winning US Market Share
Polymarket
This is a scale game disguised as a product launch. Polymarket enters the U.S. with three advantages that reinforce each other, a much larger existing trading community, a consumer brand built during the 2024 election cycle, and lower trading costs that make it easier to attract both casual bettors and professional liquidity providers. In prediction markets, the venue with the deepest book usually wins because traders go where spreads are tightest and large orders move price the least.
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Polymarket already proved it can pull huge order flow around major events, with 2024 volume reaching about $9B, and its 2025 volume running ahead of Kalshi in aggregate according to ecosystem research. That matters because traders care less about the logo and more about whether they can get filled instantly at a fair price.
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The fee gap is a direct weapon. Kalshi charges a variable contract fee and has historically experimented with sub 1 cent to low cent fees on some markets, while the U.S. Polymarket launch is tied to a near zero basis point model under QCEX. Lower fees let Polymarket spend less of each trade on exchange take, which gives it more room to subsidize liquidity and underprice rivals.
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The market is shifting from destination apps to infrastructure. Research across the category shows Robinhood, Coinbase, DraftKings, FanDuel, Kraken and others increasingly want a prediction market engine they can plug into. Once QCEX gives Polymarket a regulated U.S. venue, its global liquidity, open API posture, and crypto native market structure make it a natural wholesaler, not just a consumer app.
The next phase is likely a fight over who becomes the default back end for event contracts in America. If Polymarket can port its global liquidity habits into a regulated U.S. wrapper, the company can pressure industry pricing downward and force Kalshi and new entrants to compete on distribution, market depth, and embedded partnerships rather than on being the only legal venue.