Prediction markets processed more than $21 billion in monthly trading volume in early 2026, according to TRM Labs, a 17-fold increase from $1.2 billion in early 2025. The two dominant platforms — Kalshi (CFTC-regulated, $22 billion valuation) and Polymarket (crypto-native, $15 billion valuation) ...
"Polymarket has become an illicit market to sell and exploit national security secrets unlike any in history, and by extension a potential honeypot for foreign intelligence services." — Senator Richard Blumenthal, U.S. Senate
Prediction markets processed more than $21 billion in monthly trading volume in early 2026, according to TRM Labs, a 17-fold increase from $1.2 billion in early 2025. The two dominant platforms — Kalshi (CFTC-regulated, $22 billion valuation) and Polymarket (crypto-native, $15 billion valuation) — now collectively serve more than 800,000 unique monthly wallets and have attracted institutional fundraising exceeding $1.4 billion.
The growth has triggered a two-front crisis. Domestically, a Harvard-affiliated study flagged $143 million in statistically anomalous profits across 210,718 suspicious wallet-market pairs on Polymarket. A U.S. Army Special Forces soldier, Gannon Van Dyke, faces the first federal insider-trading prosecution tied to a prediction market after allegedly using classified intelligence about the capture of Venezuelan leader Nicolás Maduro to turn $33,934 into roughly $409,000. The House Oversight Committee opened a formal probe on May 22, 2026, demanding internal records from both platforms.
Internationally, more than 10 governments have banned or restricted prediction markets in 2026, with seven acting in a single five-week stretch from late April to early June. The legal basis is uniform: prediction markets constitute unlicensed gambling. The result is an asset class growing at triple-digit annual rates while simultaneously losing access to major population centers.
Monthly transaction volume across prediction market platforms grew from $1.2 billion in early 2025 to over $20 billion by January 2026, according to data published by blockchain analytics firm TRM Labs. Unique monthly wallets tripled to 840,000 in the six months leading up to February 2026. Kalshi recorded more than $43 billion in total trading volume during calendar year 2025; Polymarket processed approximately $33.4 billion over the same period.
The composition of trading activity has shifted materially. Geopolitics, macroeconomics, and politics — not cryptocurrency prices — now drive the majority of volume. Mid-frequency traders (11 to 1,000 fills) account for 44.7% of all trades, while market makers with over 10,000 fills represent 35.2%, according to TRM Labs. The remaining 20.1% comes from retail wallets executing 10 or fewer trades.
The CFTC's regulatory posture enabled much of this growth. In late 2025, a new CFTC chairman withdrew proposed rules that would have restricted prediction markets. In November 2025, the agency issued an Amended Order of Designation permitting Polymarket to operate as a federally regulated exchange in the U.S. through QCX LLC and QC Clearing LLC, entities Polymarket acquired for $112 million. The agency also issued no-action letters covering swap data reporting and recordkeeping requirements.
In May 2026, the CFTC separately approved initial regulatory guidance for crypto-asset perpetual futures contracts, signaling a broader derivatives-friendly stance that prediction market operators have cited as supportive of their business model.
The two dominant platforms are pursuing divergent strategies, reflected in a widening valuation gap.
Kalshi holds approximately 90% U.S. market share, according to Fortune. The platform recently crossed a $1.5 billion annualized revenue run rate and is raising $1 billion at a $22 billion valuation — a doubling from its $11 billion valuation less than four months prior. Kalshi operates as a CFTC-regulated designated contract market.
Polymarket is raising approximately $400 million at a $15 billion valuation, per Bloomberg reporting from April 2026. Unlike Kalshi, Polymarket only recently began charging trading fees. The platform has confirmed plans to launch a native POLY token, with 5-10% of supply reserved for airdrop participants. Polymarket also introduced Polymarket USD, a collateral token backed 1:1 by USDC, described as its "biggest change to date."
According to Fortune, the nearly one-third valuation discount applied to Polymarket may stem from its planned token launch, which makes it harder for investors to assess the stickiness of current trading volume. Investors may be pricing in the risk that a token-incentivized user base could prove less durable than Kalshi's fee-paying user base.
Despite the rivalry, both CEOs invested in 5CC Capital, a $35 million venture fund focused on prediction market infrastructure, according to TechCrunch reporting from March 2026.
The structural vulnerability of prediction markets to insider trading has moved from theoretical concern to active prosecution.
The Van Dyke Case. On April 24, 2026, the Department of Justice charged Master Sergeant Gannon Ken Van Dyke, a U.S. Army Special Forces soldier, with five counts: unlawful use of confidential government information for personal gain, theft of nonpublic government information, commodities fraud, wire fraud, and unlawful monetary transaction. According to the DOJ indictment, Van Dyke participated in the planning and execution of "Operation Absolute Resolve," the January 2026 U.S. military operation to capture Venezuelan leader Nicolás Maduro. Between late December 2025 and January 2, 2026, Van Dyke executed 13 trades on Maduro- and Venezuela-related Polymarket contracts, purchasing approximately $33,934 in "yes" shares. When President Trump announced the operation on January 3, Van Dyke's positions paid out roughly $409,000. He subsequently withdrew proceeds to a foreign cryptocurrency vault and attempted to delete his Polymarket account, according to the indictment. Van Dyke has pleaded not guilty; trial is tentatively scheduled for December 7, 2026. This is the first U.S. prosecution of insider trading on a prediction market.
The Harvard Study. A paper published through the Harvard Law School Forum on Corporate Governance in March 2026 examined all Polymarket markets from February 2024 through February 2026 — over 93,000 distinct markets and nearly 50,000 unique wallet addresses. Researchers flagged 210,718 suspicious wallet-market pairs where traders achieved a 69.9% win rate, a result exceeding the null distribution by more than 60 standard deviations under permutation testing. The estimated aggregate anomalous profit: $143 million. Case studies included six newly created wallets that collectively earned approximately $1.2 million in the hours before the February 28, 2026 U.S.-Israeli strike on Iran. One account, "Magamyman," placed its first trade 71 minutes before the news broke and earned approximately $553,000.
The Iran Bets. According to NPR reporting from April 2026, anonymous traders made strategic, well-timed bets on Iran-related contracts hours before U.S. military operations commenced. One account earned roughly $550,000 effectively betting that the U.S. would strike Iran and that Ayatollah Ali Khamenei would be removed from office. These events prompted calls from multiple members of Congress for formal investigations.
On May 22, 2026, House Oversight Committee Chairman James Comer launched a formal investigation into insider trading on prediction markets, according to CNBC and NPR. Comer sent document-request letters to Polymarket CEO Shayne Coplan and Kalshi CEO Tarek Mansour, with a June 5 compliance deadline.
The letters demanded records covering: identity verification procedures, geographic restrictions, internal detection systems for suspicious activity, and safeguards against the exploitation of nonpublic information.
Comer signaled he may pursue legislation barring members of Congress, administration officials, and other government employees from participating in prediction markets. The investigation follows both the Van Dyke prosecution and the Harvard study's findings.
Kalshi's head of communications stated the platform "look[s] forward to engaging with the Committee" and cited "comprehensive protections against insider trading." Polymarket has not made a detailed public response to the probe as of the time of research.
The probe raises a structural question about prediction markets' value proposition. The platforms' core utility — price discovery on uncertain events — depends on participants having asymmetric information. The difficulty lies in distinguishing between "better-informed public analysis" and "access to classified government intelligence."
While the U.S. debates insider trading safeguards, other jurisdictions have taken a simpler approach: ban the platforms outright.
Seven countries acted against prediction markets in 2026 alone. The legal rationale is nearly identical in every case: prediction markets constitute gambling, gambling requires a license, and neither Kalshi nor Polymarket holds one in most countries where their users trade.
Timeline of 2026 restrictions:
Additional countries maintaining close-only or restricted access include Singapore, Poland, Thailand, and Taiwan. Major Western markets including the U.K., France, Germany, Belgium, and Australia already block Polymarket.
The economic impact is direct. India alone represents 1.4 billion potential users; Brazil has 215 million; Indonesia has 275 million. The May 2026 wave of restrictions cut off approximately 2 billion people from prediction market access in a single month.
Three structural risks emerge from the data.
First, the insider trading problem has no clean solution. Prediction markets are designed to aggregate private information into prices. Prohibiting government employees from trading, as Comer proposes, addresses one category of insider. It does not address defense contractors, diplomatic staff at foreign embassies, corporate insiders with advance knowledge of earnings or deals, or anyone else with asymmetric information about events that prediction markets trade. The platforms' utility and their vulnerability to exploitation stem from the same mechanism.
Second, the global regulatory trajectory is unfavorable. Prediction markets are classified as gambling in most legal frameworks. Licensing as a gambling operator — the compliance path available to platforms like DraftKings or FanDuel — would impose jurisdictional restrictions, age verification requirements, and marketing limitations that conflict with the platforms' current operating model. The CFTC's classification of prediction markets as derivatives, rather than gambling, is a U.S.-specific regulatory interpretation that has limited persuasive authority abroad.
Third, the Polymarket token launch introduces misaligned incentives. If POLY tokens are distributed as airdrops to active traders, the platform creates an economic incentive structure where trading volume is rewarded regardless of whether that volume reflects genuine price discovery or wash trading for token eligibility. Investors have already flagged this risk through the valuation discount relative to Kalshi.
Prediction markets are the fastest-growing segment of the on-chain economy by volume growth rate. They are also the segment facing the most concentrated regulatory and legal pressure. The asset class's central promise — that markets aggregate information more efficiently than polls, pundits, or institutions — has been validated by the very scandal that threatens it. Markets did move before the Maduro operation and before the Iran strikes, exactly as prediction market advocates said they would. The problem is that the information being aggregated was classified.
The next six months will determine whether prediction markets can survive their own success. The Van Dyke trial in December will establish legal precedent for insider trading on event contracts. The House Oversight probe could produce the first federal statute regulating prediction market participation. And the continued international bans will test whether a platform can sustain $20 billion in monthly volume while losing access to markets representing half the world's population.
For investors, the platforms' combined $37 billion target valuation prices in continued hypergrowth. The regulatory trajectory prices in something considerably less optimistic.