Kalshi's Borrowed Moat Threatened
Kalshi at $3.5B/year
Kalshi’s biggest moat was never just regulation, it was borrowed distribution. For five years it had the only federally regulated product in the US, so partners like Robinhood and Coinbase could plug into Kalshi instead of building their own exchange. That let Kalshi concentrate order flow, especially in sports, where liquidity matters because users want tight prices and instant fills on the same game markets everyone else is trading.
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The new pressure is coming from both sides. Polymarket reentered the US in May 2026 and is attacking the same sports use case, while Robinhood has already started routing some top World Cup match contracts to its own CFTC licensed venue instead of sending that flow to Kalshi.
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These markets are winner take most at the contract level. If Bulls versus Lakers is deepest on one venue, traders, bots, and partner apps all prefer that venue because they get better execution. That is why exclusive league deals and app distribution deals matter more than brand advertising.
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Kalshi and Polymarket are also structurally different businesses. Kalshi runs a regulated, closed system with higher fees and US financial rails. Polymarket uses crypto rails, public on chain data, and lower fees. That makes Polymarket better suited to cheap global liquidity, while Kalshi is better suited to regulated US distribution.
The next phase looks less like one platform winning the whole category and more like a fight to become the default liquidity engine behind many consumer apps. Kalshi still has the strongest regulated US footprint, but keeping that lead now depends on holding partner flow, winning sports liquidity, and turning exclusivity into durable user habit before partners and rivals internalize the market.