- Kalshi and Polymarket are the big players in U.S. prediction markets, with newer entrants like OG Predictive and Plus500 gaining traction — availability varies by state, so check before signing up.
- Unlike sportsbooks, prediction markets trade yes/no contracts priced $0–$1 that reflect implied probabilities and settle to $0 or $1; they’re regulated by the CFTC, not state gambling law.
- Fees and promos differ: Kalshi/Polymarket use probability-weighted fee models, OG Predictive charges a flat per-contract fee, and welcome bonuses/minimums change by platform.
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