Combined monthly trading volume on Kalshi and Polymarket rose from under $5 billion in September 2025 to approximately $24 billion in April 2026, according to Pew Research Center data published May 27, 2026. That figure exceeds the $14 billion monthly average wagered through legal U.S. sportsbook...
"Prediction markets give anyone the opportunity to trade on the potential outcome of future events by assigning prices to uncertainty. Unlike polls or editorial commentary, real capital is backing prices that are updated continuously." — Cathie Wood, CEO, ARK Invest
Combined monthly trading volume on Kalshi and Polymarket rose from under $5 billion in September 2025 to approximately $24 billion in April 2026, according to Pew Research Center data published May 27, 2026. That figure exceeds the $14 billion monthly average wagered through legal U.S. sportsbooks in 2025, repositioning prediction markets as a larger liquidity pool than regulated sports betting.
The sector's two dominant platforms now command a combined valuation exceeding $37 billion. Kalshi closed its Series F at $22 billion in May 2026. Polymarket is in talks for a $400 million raise at $15 billion, per Bloomberg, following a $600 million investment from Intercontinental Exchange, parent of the New York Stock Exchange. Polymarket reported annualized revenue exceeding $1 billion on June 26, 2026 — six weeks after lifting its U.S. waitlist — having generated $0 in revenue through all of 2025 when it operated fee-free. Kalshi's annualized revenue reached $2 billion as of May 2026.
A Federal Reserve research paper, a CFTC proposed rulemaking, lawsuits from nine U.S. states, and Meta's announcement of a competing app all arrived within the same quarter, indicating that prediction markets have crossed from crypto-native curiosity to a contested category in mainstream finance.
Monthly prediction market volume trajectory, per TRM Labs and Pew Research Center:
| Period | Monthly Volume | Unique Wallets | |--------|---------------|----------------| | Early 2025 | ~$1.2B | ~280,000 | | September 2025 | ~$5B | ~300,000 | | January 2026 | $20B+ | 800,000+ | | February 2026 | $21B+ | 840,000 | | March 2026 | $25.7B | N/A | | April 2026 | ~$24B | N/A |
Bernstein projects full-year 2026 volumes at $240 billion. Event contracts totaled $52 billion in cumulative notional as of March 2026. Polymarket alone settled $9.4 billion in cumulative notional through May 2026 across approximately 14,200 markets on Polygon PoS, using USDC as the settlement currency.
The user base expansion is notable. Monthly unique wallets nearly tripled in six months to 840,000 by February 2026, according to TRM Labs. This suggests volume growth is driven by participant base expansion, not solely by increased trade size from existing users.
The two platforms differ in regulatory structure, fee models, and market composition.
Kalshi operates as a CFTC-registered Designated Contract Market (DCM). It charges uniform fees on both sides of trades. May 2026 monthly volume: $17.9 billion, representing approximately 57% market share. Annualized revenue: $2 billion. Valuation: $22 billion (Series F, May 2026).
Polymarket operates internationally on Polygon PoS with USDC settlement. It began charging fees in January 2026 on high-frequency crypto markets, expanded to select sports markets in February, and rolled out a broader fee schedule in March. June 26, 2026 annualized revenue disclosure: above $1 billion. Valuation: $15 billion (in talks, per Bloomberg, April 2026).
Q1 2026 was a record quarter for both: $33 billion traded on Kalshi, $26.17 billion on Polymarket, per Pew Research Center. Combined Q1 volume: approximately $59 billion.
Polymarket's U.S. exchange launched in December 2025 under a waitlisted model. The waitlist was removed for mobile users in mid-May 2026. Daily trading volume on the U.S. platform jumped from approximately $50 million in mid-May to over $200 million by June 20, per CNBC — a 4x increase in five weeks. Desktop access remains unavailable.
Kalshi controls 89% of U.S. prediction market activity, per CoinDesk reporting from April 2026. Polymarket's share is concentrated in international markets and crypto-native participants.
The platforms show distinct category distributions, per Pew Research Center data covering July 2024 through early 2026:
| Category | Kalshi Share | Polymarket Share | |----------|-------------|-----------------| | Sports | 80% | 39% | | Politics | 4% | 32% | | Crypto | ~7% | ~20% | | Other | ~9% | ~9% |
Sports, politics, and cryptocurrency together account for 91% of volume on Kalshi and 90% on Polymarket.
The 2026 FIFA World Cup, underway since June, has accelerated sports-category volume on both platforms. Polymarket's World Cup winner market alone approached $2 billion in trading volume, according to Sigma World reporting. Industry estimates project the World Cup will generate $5 billion to $10 billion in combined prediction market transaction volume across both platforms.
TRM Labs research noted a structural shift: geopolitics, macroeconomics, and politics — not crypto — now drive the majority of trading activity, positioning prediction markets as real-time indicators of global events rather than crypto-native speculation tools.
Two developments in early 2026 provided institutional credibility that prediction markets had previously lacked.
Federal Reserve Paper. A Finance and Economics Discussion Series paper titled "Kalshi and the Rise of Macro Markets," authored by Anthony Diercks (Federal Reserve), Jared Dean Katz (Northwestern University), and Jonathan Wright (Johns Hopkins / NBER), analyzed Kalshi event contracts tied to inflation, Fed rate decisions, GDP, and unemployment. Key findings: Kalshi's mean absolute error for federal funds rate forecasts 150 days ahead was comparable to professional forecaster surveys, with the advantage of continuous updating rather than six-week snapshot intervals. For core CPI and unemployment, Kalshi forecast errors were statistically similar to Bloomberg consensus. The paper described prediction markets as "a high-frequency, continuously updated, distributionally rich benchmark that is valuable to both researchers and policymakers."
Trading Technologies Integration. Trading Technologies announced integration of Kalshi's federally regulated prediction markets onto its institutional platform. The move signals prediction markets' transition from retail-oriented platforms to institutional-grade infrastructure accessible through the same terminals used for futures and options trading.
ICE Investment. Intercontinental Exchange, which operates the NYSE, invested $600 million in Polymarket as part of a commitment of up to $2 billion. This represents the largest single investment in a crypto-native prediction platform by a traditional exchange operator.
The regulatory landscape fractured along federal-state lines in Q1-Q2 2026.
Federal actions favoring prediction markets:
State actions opposing prediction markets:
The core legal dispute centers on classification: whether event contracts are federally regulated derivatives under the Commodity Exchange Act or gambling products subject to state licensing. Legal analysts cited by multiple outlets expect the question to reach the Supreme Court, potentially as early as 2027.
TRM Labs identified coordinated wallet activity around sensitive geopolitical events that raised questions about potential insider trading and market manipulation. The CFTC's Director of Enforcement designated "insider trading in prediction markets" as a top enforcement priority for 2026.
The CFTC and Department of Justice have brought actions alleging violations of Section 6c of the Commodity Exchange Act and Regulation 180.1, targeting individuals who traded event contracts using material nonpublic information obtained in violation of a preexisting duty, according to a Congressional Research Service report (LSB11406).
Mid-frequency traders (11-1,000 fills) and high-frequency market makers together account for approximately 80% of volume, per TRM Labs, while casual and first-time participants remain modest contributors. This concentration raises questions about market representativeness — whether prices reflect broad crowd wisdom or the views of a relatively small cohort of active traders.
On June 23, 2026, reports emerged that Meta CEO Mark Zuckerberg directed a team to build "Arena," a standalone prediction market app. Key details, per NPR and TechCrunch:
Meta's entry validates the category's user-acquisition potential but operates on a fundamentally different model — no real money, AI-resolved outcomes — that places it closer to gamification than to financial infrastructure.
The announcement sent Kalshi-related and prediction market equities lower on June 23, per CNBC, reflecting competitive concerns despite the different product models.
ARK Invest sizes the medium-term prediction market opportunity at $1 trillion to $5 trillion over a 3-5 year horizon, anchoring to the lower end as a grounded starting point, per a research report published in 2026. ARK's thesis: prediction markets' potential will be realized through their role as financial infrastructure — pricing uncertainty across economic, political, and event-driven domains — rather than as standalone betting platforms.
For context, current annualized run-rate:
The 12x revenue multiple implied by combined valuations is aggressive relative to traditional exchange operators (ICE trades at approximately 11x forward revenue, CME at approximately 14x) but reflects expected growth rates that traditional exchanges no longer exhibit.
Prediction markets in H1 2026 crossed a series of thresholds — $20 billion monthly volume, $1 billion platform revenue, Federal Reserve academic validation, NYSE-parent investment — that collectively mark the sector's transition from experimental to institutional. The volume now exceeds U.S. legal sports betting, the two leading platforms command valuations rivaling mid-cap exchange operators, and a Federal Reserve paper positions their pricing data alongside Bloomberg consensus as a macroeconomic forecasting tool.
The unresolved question is jurisdictional. The federal government and more than a dozen states are in direct litigation over whether prediction markets are derivatives or gambling. The CFTC's proposed rulemaking, with comments due July 27, 2026, will shape the regulatory perimeter for the next cycle. If federal preemption holds, the sector's current growth trajectory remains intact. If states prevail in classifying event contracts as gambling, platforms face a patchwork of licensing requirements that would fragment the U.S. market.
The economic value generated flows primarily through trading fees — Kalshi and Polymarket together extracting approximately $3 billion annually from $240 billion in projected volume, implying a sector-wide take rate of roughly 1.25%. Whether that value accrues to platform operators, liquidity providers, or is competed away by new entrants like Meta remains an open structural question. What the data confirms is that pricing uncertainty is now a standalone asset class with institutional-scale capital flows.