A Guide to US Prediction Market Platforms: From Kalshi to Polymarket

Prediction markets are emerging as a sophisticated tool for speculating on future events, transforming crowd-sourced forecasts into tradable financial contracts. Unlike traditional betting, these platforms allow users to buy and sell shares in the likelihood of an outcome—from election results and inflation data to Bitcoin price targets—with prices fluctuating between $0.00 and $1.00 to reflect real-time probability estimates. This model, which treats contracts as derivatives under CFTC oversight, is gaining a foothold in the U.S. through a growing ecosystem of regulated and niche applications. The landscape is dominated by platforms catering to distinct interests. For real-world economic and political events, Kalshi operates as a U.S.-regulated exchange with clear rules on contracts ranging from Federal Reserve decisions to weather outcomes. Conversely, Polymarket thrives on rapid price movements during major global news events, elections, and crypto milestones. For sports-centric users, apps like Underdog and PrizePicks focus on athlete performance projections rather than game outcomes. Meanwhile, mainstream financial apps like Robinhood and Crypto.com have integrated prediction markets, though often with a more limited selection than dedicated platforms. A critical differentiator from fixed-odds betting is the ability to trade contracts dynamically before an event resolves. If a trader purchases a "Yes" contract at $0.40—implying a 40% market-assessed probability—and subsequent news drives the price to $0.65, they can sell to secure a profit without waiting for the final outcome. This liquidity and flexibility appeal to those seeking short-term trading opportunities or hedging strategies. However, the regulatory environment remains a patchwork; while federal oversight theoretically permits nationwide operation, several states restrict markets on sports and politics, requiring users to verify platform eligibility based on location. Engagement is further driven by platform-specific incentives, from Kalshi's referral bonuses to Polymarket's daily trading rewards. New entrants like OG, launched in early 2026, are innovating with multi-outcome contracts beyond simple yes/no formats. As with any speculative venture, participants are cautioned to only risk capital they can afford to lose and to thoroughly understand contract settlement terms. For those comfortable with the risks, prediction markets offer a unique convergence of financial trading, collective intelligence, and real-world event analysis.