Polymarket and Kalshi launched combo bet features that let users bundle multiple prediction outcomes into a single wager. Retail users achieved a median return of -8% from mid-2025 to March 2026, worse than the -5% median return on traditional sportsbooks. Each additional leg in a combo bet compounds the house edge, as market makers capture margin on every individual outcome. The 2026 World Cup drove record engagement on prediction market platforms, with total volumes reaching tens of billions during 2025-2026. Robinhood’s integration has been particularly significant in driving mainstream adoption.
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