Prediction market platform Polymarket recorded its first monthly trading-volume decline in eight months during April 2026, while rival Kalshi continued gaining market share with double-digit growth, according to industry data and market reports.
Monthly trading volume on Polymarket’s offshore exchange and U.S. app fell roughly 9% in April to around $10.2 billion–$10.3 billion, down from more than $11 billion in March, based on Dune Analytics data cited by Bloomberg and other crypto market trackers.
Meanwhile, U.S.-regulated competitor Kalshi posted approximately 13% monthly growth, with April trading volume climbing to a record $14.8 billion.
Kalshi Pulls Ahead in Prediction Market Race
The latest figures highlight the rapidly shifting balance in the prediction-market industry, where Kalshi has increasingly expanded its lead over Polymarket since late 2025.
Combined prediction-market volume still grew overall in April despite Polymarket’s decline. Industry-wide trading activity reportedly rose 12.4% month-over-month to approximately $29.8 billion, indicating traders are migrating toward competing platforms rather than leaving the sector entirely.
Kalshi’s growth has been fueled by expanding adoption of event contracts tied to politics, sports, economics, and cultural events. The platform has also benefited from its status as a federally regulated exchange under the oversight of the U.S. Commodity Futures Trading Commission (CFTC).
Polymarket, by contrast, still faces regulatory limitations in the United States following earlier settlements with regulators over unregistered derivatives trading allegations.
Regulatory Pressure Intensifies Across Prediction Markets
The slowdown for Polymarket comes amid growing political and regulatory scrutiny of prediction markets across the U.S. and internationally.
In recent months, lawmakers and state regulators have challenged whether sports and political prediction contracts effectively function as gambling products. Wisconsin Attorney General Josh Kaul recently filed lawsuits against multiple prediction-market operators, including Kalshi and Polymarket, alleging violations of state gambling laws.
At the same time, the CFTC has defended its authority over federally regulated event-contract exchanges, creating ongoing jurisdictional disputes between federal and state regulators.
Polymarket has additionally faced criticism over insider-trading concerns, market manipulation allegations, and misinformation tied to certain political and geopolitical betting markets.
Prediction Markets Continue Rapid Expansion
Despite April’s slowdown, the broader prediction-market industry remains one of the fastest-growing segments in fintech and crypto trading.
Kalshi was recently valued at around $22 billion following a major funding round, while Polymarket has reportedly explored fundraising efforts at valuations approaching $15 billion.
The sector gained mainstream attention during the 2024 U.S. presidential election cycle, when billions of dollars flowed into political prediction markets. Since then, platforms have rapidly expanded into sports, economic data, cryptocurrency events, and global news-based contracts.
According to industry estimates, prediction-market platforms collectively surpassed $150 billion in lifetime trading volume during April 2026.
Analysts Watch Whether Polymarket Can Rebound
Market analysts are now closely watching whether Polymarket can regain momentum as competition intensifies and regulators tighten oversight of event-based trading products.
The company has been attempting to re-enter the U.S. market through compliant structures and recently expanded its infrastructure and partnerships to simplify user onboarding.
However, Kalshi’s continued growth, combined with increasing institutional adoption of regulated event contracts, suggests the prediction-market industry could become increasingly dominated by licensed U.S.-based platforms over offshore crypto-native competitors.
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