Prediction Market Trading Volume Soars, Rivaling Traditional Sports Betting

Trading activity on major prediction markets has exploded, with volumes now rivaling and even surpassing the scale of the regulated U.S. sports betting industry. According to a new Pew Research Center analysis of data from The Block, the combined monthly global trading volume on the two leading platforms, Kalshi and Polymarket, skyrocketed from less than $5 billion in September 2025 to approximately $24 billion by April 2026. This remarkable growth underscores a rapid mainstreaming of markets where users trade contracts on real-world outcomes, from electoral results to championship games. The surge places prediction markets in direct scale comparison with established gambling sectors. The analysis notes that the $24 billion monthly volume for April 2026 notably exceeds the average monthly handle of about $14 billion for all legal sportsbooks across the United States throughout 2025. On these platforms, users buy and sell binary contracts, priced between $0 and $1 to reflect the perceived probability of an event; a winning contract pays out $1. The vast majority of this speculative activity is concentrated on three topics: sports, politics, and cryptocurrency. Since July 2024, these categories have constituted 91% of trading volume on Kalshi and 90% on Polymarket. Market dominance among these topics can shift dramatically with current events, particularly in politics. During the period of the 2024 U.S. presidential election in October and November, political markets accounted for 90% of all trading volume on Kalshi and 65% on Polymarket. It is critical to note the regulatory distinction between the two primary platforms: Kalshi operates under the oversight of the U.S. Commodity Futures Trading Commission (CFTC), while the far larger Polymarket International does not. A newer, CFTC-regulated Polymarket US entity exists for American users but recorded a comparatively modest $1.3 billion in volume for April 2026 versus $9 billion on its international counterpart. While these markets facilitate trading on a wide array of niche events—from celebrity statements to local weather—such topics remain a fractional share of overall activity. The data reveals a financial ecosystem that is both responsive to the news cycle and increasingly a formidable force in the broader prediction economy. As these platforms continue to grow, they attract significant capital seeking to hedge or profit on future certainty, challenging traditional boundaries between financial speculation, data aggregation, and gambling.