Last Updated on July 11, 2026 by Fiza Khurram
Niche Trading Tool to Cultural Phenomenon
Eighteen months ago, prediction markets were a curiosity for political junkies and crypto enthusiasts. Today, they are trading more money every month than America’s legal sportsbooks. Combined monthly volume on Kalshi and Polymarket hit roughly $24 billion in April 2026, according to a Pew Research Center analysis, compared with about $14 billion wagered monthly through legal U.S. sportsbooks in 2025. Kalshi alone processed a record $17 billion in trading volume in a single month this spring, up more than 2,500% from a year earlier.
Two Very Different Platforms, One Fast-Growing Market
Kalshi operates as a federally regulated exchange overseen by the Commodity Futures Trading Commission, giving it a structure closer to a traditional derivatives market than a betting app. Polymarket, historically a crypto-native, blockchain-based platform, has moved to establish its own regulated U.S. arm through the acquisition of a CFTC-designated contract market, blurring the once-clean distinction between the two rivals. Roughly 87% of Kalshi’s recent trading volume has come from sports contracts alone, underscoring how much of the boom is being driven by fans treating event contracts as a substitute for traditional betting.
| Metric | September 2025 | April–May 2026 |
| Combined monthly volume (Kalshi + Polymarket) | Under $5 billion | Approximately $24 billion |
| Kalshi monthly volume | ~$30 million (Jan 2025) | $17 billion (May 2026 record) |
| Share of Kalshi volume from sports | — | ~87% |
| U.S. legal sportsbook monthly handle (2025 comp.) | — | ~$14 billion |
A Regulatory Reckoning Is Underway
The industry’s explosive growth has triggered an equally fast regulatory backlash. As of July 2026, the CFTC has initiated legal action against nine states including Arizona, Connecticut, Illinois, New York, New Mexico, Minnesota, Rhode Island, Wisconsin and Kentucky arguing that its federal authority over exchange-traded derivatives preempts state gambling law. Nevada has gone further, securing court injunctions that have temporarily blocked both Kalshi and Polymarket from operating in the state, rulings that are now under appeal at the Ninth Circuit. Minnesota became the first state to pass an outright ban on prediction market platforms, making it a felony to host or advertise them, though the CFTC has already sued to block enforcement.
The core legal question is deceptively simple: are these platforms legitimate derivatives exchanges where the market itself sets the odds, or are they, as several state attorneys general argue, functionally indistinguishable from sports betting dressed up in financial-market language? Legal experts increasingly believe the dispute is headed toward the U.S. Supreme Court within the next one to two years.
Insider Trading, Ethics, and the “Death Markets” Debate
Beyond the jurisdictional fight, lawmakers are increasingly focused on integrity questions. Both platforms have launched advertising campaigns explicitly denying that they permit insider trading or allow betting on deaths, moves widely seen as a response to congressional scrutiny. Kalshi is barred by CFTC rules from listing contracts tied to assassination, terrorism or war; Polymarket, which operates more broadly outside the U.S., permits some geopolitical and conflict-related markets internationally, prompting sharp criticism from ethicists who argue it risks financializing human suffering. Some officials have also flagged conflicts of interest given prominent political figures’ advisory ties to the platforms.
Why Wall Street Is Paying Attention
Institutional interest is growing alongside the controversy. Kalshi has begun courting Wall Street firms as its next major growth constituency, and the CFTC has approved the first-ever perpetual futures product listed on a regulated U.S. exchange through Kalshi’s platform. Meanwhile, the SEC has paused a wave of proposed prediction-market ETFs pending further public comment, signaling that regulators want to fully resolve the legal status of the underlying markets before letting them into mainstream investment products.
The Road Ahead
For now, prediction markets sit in a genuinely unusual position: too large to ignore, too legally contested to fully embrace. Expect continued state-by-state patchwork regulation, more congressional hearings, and an eventual high-court ruling that will determine whether trading on the outcome of a Fed meeting, an election or a football game is treated as a sophisticated financial instrument or as gambling that happens to wear a suit.