Polymarket Faces Scrutiny Over $200 Million in Flagged Trades

Polymarket allows users to trade crypto-based contracts tied to real-world outcomes, but markets involving military operations and defense decisions risk turning classified information into profit. A research report found that a group of wallets repeatedly made highly accurate military wagers, raising suspicions that some traders may have had access to nonpublic information and exposing a regulatory gap around national security and insider activity in decentralized prediction markets.

More than 150 crypto wallets recorded a 97.2% win rate on military-related bets, according to the report. Their unusual performance reportedly drew automated trading bots and large holders seeking to copy the positions, potentially amplifying the consequences of any intelligence leak. The researchers recommended mandatory know-your-customer checks and urged regulators to consider banning markets tied to sensitive secrets. The available report did not identify the research institution, disclose the amount wagered or provide a publication date.

Gannon Ken Van Dyke, a U.S. Army Special Forces master sergeant, is accused of using classified information gained while planning and carrying out Operation Absolute Resolve to trade event contracts on blockchain-based Polymarket. The case is the Commodity Futures Trading Commission’s first insider-trading action involving event contracts and its first use of the “Eddie Murphy Rule” against misuse of government information. Its outcome could help determine whether such contracts qualify as swaps under the Commodity Exchange Act, shaping federal oversight of fast-growing prediction markets.

U.S. District Judge Andrew L. Carter Jr. in Manhattan on Aug. 10 allowed the Justice Department to intervene and stayed the CFTC’s civil case, filed April 23, until the parallel criminal proceeding ends. The regulator alleges Van Dyke bought more than 436,000 “Yes” shares between Dec. 30, 2025, and Jan. 2, 2026, spending about $33,000 and generating more than $404,000 in profit on contracts tied to Nicolás Maduro’s removal. Van Dyke has pleaded not guilty to five criminal counts, including commodities fraud and wire fraud.

Decentralized prediction market Polymarket has been hailed as a truth machine. But a recent dispute over a contract asking whether MicroStrategy had sold Bitcoin exposed how such platforms’ determinations of fact can be highly vulnerable to after-the-fact rule interpretations, biased oracle voting and manipulation by large traders. It has also revived a regulatory debate over whether prediction markets should be treated as online gambling or financial derivatives venues.

The dispute began in May 2026, when MicroStrategy sold 32 Bitcoin before the May 31 deadline but did not report the transaction until June 1. Polymarket subsequently changed the rules and resolved the market as “No,” prompting fierce investor backlash. In July 2026, several traders who had backed “Yes” filed a class-action lawsuit against the platform in New York, alleging breach of contract and fraud and accusing it of depriving investors of legitimate gains through a biased decision.

Polymarket is a prediction market where users trade crypto assets based on the outcomes of events, attracting customers with contracts tied to politics, sports and other topics. A Wall Street Journal investigation said the platform appeared to have paid college content creators to execute sham trades on highly realistic simulation sites, presenting fabricated profits as genuine betting experiences. The allegations raise questions about advertising disclosures and consumer trust.

The investigation found more than 1,000 promotional videos showing fake bets and profits, even though the creators had not assumed the risks claimed in the footage. Polymarket said it would conduct a comprehensive review of the content. During the 2026 World Cup, a “mystery wallet” was also said to have placed highly accurate bets and made NT$24 million in arbitrage profits, renewing scrutiny of whether the platform uses misleading promotions to attract users.

Polymarket and Kalshi allow users to wager through contracts on the outcomes of political, economic and other events, with contract prices also viewed as a crowd-based measure of probability. Although such prediction markets can aggregate information, retail participants face information gaps and competition from professional quantitative firms, raising questions about whether profits are distributed fairly.

A recent Wall Street Journal analysis of Polymarket and Kalshi data found that just 0.1% of professional accounts captured 67% of total profits, while more than 70% of Polymarket users lost money. The report did not disclose the data cutoff date, sample size or actual profit amounts, but the figures show that gains were highly concentrated.

Prediction markets allow users to put money behind their forecasts for political, economic and cultural events, but they have often been viewed as venues for occasional gambling. A report by Bitget Wallet and Polymarket says retail users are increasingly trading frequently, gradually turning such platforms into everyday tools for tracking news trends and market consensus.

Polymarket's monthly trading volume rose to $25.7 billion in early 2026, while its number of active wallets also increased sharply. The figures suggest participation is no longer driven solely by major elections. The report estimates that the prediction market industry could reach $240 billion, signaling that these platforms are rapidly moving into the mainstream.

Polymarket is an onchain prediction market built on Polygon where users trade on the outcomes of political, economic, technology and other events. The platform generates revenue from trading fees. Its revenue surge suggests prediction markets may become a sustainable crypto finance business rather than relying solely on election-driven interest, though regulatory pressure in the United States, Europe and Argentina remains a major risk.

On March 30, 2026, Polymarket expanded taker fees beyond crypto and sports to markets covering finance, politics, economics, culture, weather and technology. DeFiLlama data showed daily fees rising from about $363,000 to more than $1 million on both April 1 and April 2, putting the early annualized estimate at about $338 million. Fees totaled $7.1 million in the first week of the second quarter, accounting for 96.8% of all onchain prediction-market fees.

Polymarket is a blockchain-based decentralized prediction market where contract prices are generally treated as the probability of an event occurring. Research found that the platform may not adjust prices simultaneously when markets have complex logical relationships, such as mutual exclusivity or inclusion. Quantitative traders can exploit those discrepancies by combining positions to lock in spreads, exposing a structural efficiency gap in Polymarket's pricing mechanism.

Research findings released as of July 2026 showed that traders used Bregman projections and the Frank-Wolfe algorithm to identify inconsistent probability pricing across Polymarket contracts and construct approximately risk-free arbitrage portfolios. The model estimated that such strategies generated close to $40 million in cumulative profit over the past year, indicating that the mispricing was not a short-lived anomaly confined to a single market.

ZachXBT has long used onchain fund flows to investigate crypto fraud and insider trading, with his public findings often affecting the reputations of projects involved and their token prices. Although the subject of this investigation has not been disclosed, it has already attracted heavy wagering on prediction market Polymarket. The betting has also raised fairness concerns over whether some participants possess nonpublic information.

ZachXBT is expected to release a major insider-trading investigation on February 26. Nearly $3 million has been wagered on Polymarket contracts speculating about which organization will be exposed, with Solana ecosystem project Meteora currently carrying the highest odds. Recent reporting also said suspected insider wallets had wagered that Axiom would be the subject of the investigation, building positions worth $1.2 million.

Polymarket allows users to wager crypto assets on event outcomes. Although its onchain transactions are publicly visible, the offshore platform does not require identity verification. After onchain investigator ZachXBT said he would expose insider trading at a crypto company, a market opened for users to guess the company’s identity. Ironically, advance information may itself have leaked in the market betting on an insider-trading investigation.

On Feb. 26, 2026, ZachXBT identified Axiom as the subject of the investigation, alleging that its employees may have misused internal tools to track users’ wallets. The prediction market had recorded about $40 million in trading volume since Feb. 23. Lookonchain found that at least 12 newly created wallets had bet on Axiom in advance, earning more than $1 million in total, including $411,000 for one wallet. Axiom has revoked the relevant access and is investigating a possible leak.