Prediction markets generated $148 billion in trading volume on Kalshi alone through the first seven months of 2026, representing 85% of the platform's all-time activity. Combined monthly volume across Kalshi and Polymarket reached $24 billion by April, up from under $5 billion in mid-2025, accord...
"Individual traders drove Kalshi's rise. Now, it's going for Wall Street." — CNBC, June 2026
Prediction markets generated $148 billion in trading volume on Kalshi alone through the first seven months of 2026, representing 85% of the platform's all-time activity. Combined monthly volume across Kalshi and Polymarket reached $24 billion by April, up from under $5 billion in mid-2025, according to Pew Research Center data. The 2026 FIFA World Cup accelerated adoption, with Kalshi recording $12.4 billion in tournament-related volume — $27 billion including parlays — surpassing the entire U.S. legal sportsbook handle for June and July combined.
The competitive landscape has shifted decisively. Kalshi, a CFTC-regulated exchange, held 73% market share by July 2026 per DeFi Rate data, up from roughly 50% at the start of the year. Polymarket, the crypto-native platform that relaunched its U.S.-compliant version in December 2025, posted declining volumes and faces an active CFTC investigation into its marketing practices. Meanwhile, institutional infrastructure is materializing: Tradeweb took a minority stake in Kalshi, Clear Street became its first institutional FCM member, and River Markets raised $8.5 million to build prime brokerage services for the sector. Kalshi itself raised $1 billion at a $22 billion valuation in March and is now seeking capital at $40 billion.
The prediction market sector has transitioned from a niche crypto experiment into a regulated financial market category attracting Wall Street infrastructure providers, hedge funds, and proprietary trading firms.
Prediction market trading volume has undergone a structural shift in scale. According to Pew Research Center analysis covering July 2024 through May 2026, combined monthly volume on Kalshi and Polymarket rose from under $5 billion in mid-2025 to nearly $24 billion by April 2026. TRM Labs reported that monthly volumes reached $21 billion during the same period. Q2 2026 volume across prediction markets hit $111 billion, representing 1,764% year-over-year growth.
Kalshi's 2026 trading volume topped $148 billion through July, making up 85% of the platform's all-time activity, according to BitRSS data. Kalshi recorded approximately $37.7 billion to $41 billion in volume during July alone, its strongest month.
For context, the total amount wagered through legal U.S. sportsbooks averaged approximately $14 billion per month in 2025, according to Pew Research. Prediction markets have surpassed traditional sports betting on a volume basis.
Full-year 2026 projections based on year-to-date run rates suggest prediction market volumes could exceed $325 billion, up from $64 billion for all of 2025 — itself a 4x sequential increase over 2024.
The two dominant platforms have diverged sharply in 2026 on both volume and regulatory positioning.
Kalshi operates as a CFTC-designated contract market (DCM) and has steadily consolidated market share. In April 2026, Kalshi traded $14.81 billion in notional volume, reaching a record at the time, with 72% of combined two-platform volume. By May, Kalshi's volume hit $17.91 billion — its ninth consecutive monthly record. DeFi Rate data showed Kalshi at roughly 73% market share by early July.
Kalshi's institutional trading volume grew 800% over the prior six months, per company disclosures. Annualized platform volume more than tripled to $178 billion. The World Cup brought 3 million new accounts to the platform.
Polymarket has experienced volume contraction and regulatory headwinds. April 2026 volume fell 8.9% to $10.2 billion, the platform's first monthly decline in eight months. By May, Polymarket posted $7.08 billion, down 21% from its March peak.
Polymarket's competitive challenge is structural. In April 2026, the platform's offshore international exchange handled $9 billion in trading volume, while its compliant U.S. version — launched in December 2025 after Polymarket spent $112 million acquiring CFTC-licensed QCEX in July 2025 — managed just $1.3 billion. That 7-to-1 ratio persists: the majority of liquidity remains offshore, with the U.S. version banned in eight states and offering fewer contract types.
One bright spot: Polymarket's U.S. platform reached $1 billion in annualized revenue within six weeks of its May 2026 full launch, suggesting that its compliant offering — while smaller — is monetizing effectively.
The 2026 FIFA World Cup served as the sector's largest-ever demand catalyst. Prediction markets recorded over $50 billion in tournament-related volume, according to CoinDesk, surpassing traditional sportsbook handles for the period.
Kalshi recorded $12.4 billion in World Cup volume excluding parlays, and $27 billion with parlays included, according to Inside World Football. Combined Kalshi and Polymarket World Cup volume reached $19 billion in notional trading. The Final Four matches alone generated $2.8 billion in trading volume on Kalshi, per Deadspin. More than $5 billion was wagered across platforms ahead of the World Cup final, according to The Mirror.
The tournament demonstrated that event contracts can attract mainstream consumer participation at scales that rival — and in some categories exceed — traditional sports betting. Kalshi's 3 million new accounts during the tournament period provide a durable expansion of the user base beyond the event itself.
The CFTC's regulatory posture toward prediction markets shifted materially in 2026.
CFTC Rulemaking. On June 10, 2026, the CFTC published a notice of proposed rulemaking (NPRM) proposing comprehensive amendments to Regulation 40.11 and adding Appendix F to Part 40. The framework establishes a three-step sequential analysis for event contracts: (1) whether it involves an excluded commodity; (2) whether it "involves" an enumerated activity such as unlawful activity, terrorism, gaming, or similar activity; and (3) whether it is contrary to the public interest. The comment period closed July 27, 2026. This represents a more permissive stance than the CFTC's 2024 proposal, which would have prohibited political and sports event contracts.
Polymarket CFTC Investigation. The CFTC opened an investigation into Polymarket in late June 2026, according to CNBC. The probe focuses on marketing, consumer protection, and compliance practices. Specifically, the Wall Street Journal reported that Polymarket paid content creators to post staged betting videos — depicting simulated trades and fabricated wins — to promote the platform. Senators John Curtis (R-UT) and Adam Schiff (D-CA) sent a June 25 letter urging CFTC Chairman Michael Selig to investigate the allegations. Polymarket stated it is conducting a "comprehensive audit" of its promotional content.
The investigation is not yet an enforcement action, but it marks a significant escalation for a platform that settled with the CFTC in 2022 and was barred from servicing U.S. users on its global exchange. The fact that Americans continue to trade billions on Polymarket's offshore platform — despite the ban — compounds the regulatory risk.
The prediction market sector is rapidly developing the institutional plumbing that characterized crypto derivatives' maturation from retail to institutional adoption.
Tradeweb–Kalshi Partnership. On February 19, 2026, Tradeweb Markets and Kalshi announced a strategic partnership. Tradeweb made a minority investment in Kalshi and committed to developing the first institutional-focused marketplace for event contracts. On June 24, Tradeweb launched a dedicated Kalshi pricing page, giving U.S. institutional clients access to event contract data. Tradeweb's involvement is significant: it handles over $1 trillion in average daily volume across fixed income, ETFs, and derivatives.
Clear Street FCM Access. Clear Street became Kalshi's first institutional futures commission merchant (FCM) member, giving hedge funds direct clearing access to event contracts. Clear Street also launched swap capabilities for ETF issuers seeking to structure listed investment products around prediction market outcomes.
River Markets. On August 11, 2026, River Markets announced an $8.5 million seed round led by Haun Ventures, with participation from Y Combinator, Coinbase Ventures, Qube Research Technologies (QRT), and angels from Citadel, Google, NVIDIA, and JPMorgan. The company is building prime brokerage infrastructure for prediction markets — unified execution and risk management across venues. The platform launched May 1, with several top-10 traders by volume on both Kalshi and Polymarket already using the service.
Marex Group is building technical infrastructure to link professional investors to both Kalshi and Polymarket, per Finance Magnates.
Capital Raised. Kalshi raised $1 billion at a $22 billion valuation in March 2026, with investors including Coatue Management, Sequoia Capital, Andreessen Horowitz, and Morgan Stanley. As of June, CoinDesk reported Kalshi is seeking fresh capital at a $40 billion valuation. For comparison, Polymarket acquired QCEX for $112 million to secure its CFTC license and has not disclosed a recent valuation.
Examining where economic value accrues in prediction markets reveals a familiar pattern from other financial market evolutions.
Platform operators capture trading fees. Kalshi charges fees on contracts; its annualized platform volume of $178 billion at even low basis-point take rates generates substantial revenue. Polymarket's U.S. platform hit $1 billion in annualized revenue within six weeks of full launch.
Infrastructure providers are monetizing through partnership economics. Tradeweb, Clear Street, and Marex are positioning for clearing, data distribution, and access fees — the same revenue streams that defined their role in traditional derivatives markets.
Prime brokers like River Markets capture margin on unified execution — aggregating liquidity across venues for a fee, as prime brokers do in FX, equities, and crypto.
Liquidity providers and market makers — including proprietary trading firms from Citadel and HRT backgrounds — provide depth in exchange for the bid-ask spread. The 800% growth in Kalshi's institutional volume suggests that market-making and quantitative trading strategies are now materially present.
Retail participants provide the volume base. The World Cup's 3 million new Kalshi accounts demonstrate consumer demand, though Pew Research data indicates that most Polymarket users trade small amounts — consistent with consumer-oriented event wagering rather than institutional hedging.
The sector's value chain is converging toward the structure of traditional exchange-traded derivatives: exchanges, clearinghouses, FCMs, prime brokers, data vendors, and end-users. The economic question is whether prediction market fees can sustain the infrastructure being built around them at current and projected volumes.
Prediction markets in 2026 are no longer a crypto curiosity. They are a $325 billion annualized volume market attracting the same institutional infrastructure — FCMs, prime brokers, data vendors, exchange partnerships — that characterized the maturation of listed derivatives, OTC swaps, and crypto perpetuals before them.
The competitive outcome between Kalshi and Polymarket appears increasingly asymmetric. Kalshi's CFTC-native regulatory positioning, institutional partnerships, and World Cup-driven user acquisition have consolidated its lead. Polymarket's split between a large offshore platform it cannot legally serve to Americans and a smaller compliant version creates structural tension that the CFTC investigation may sharpen.
The open question is not whether prediction markets will attract institutional capital — Clear Street, Tradeweb, and Marex have already answered that. The question is whether the sector's fee economics can justify the $40 billion-plus valuations now being attached to platform operators, or whether the familiar compression of exchange trading fees will erode margins before profitability scales to match.