In just a few days, Polymarket has found itself at the center of two separate cases. A U.S. Army soldier charged with using classified information to bet on the fall of Maduro. And in France, a Météo France weather sensor possibly manipulated to trigger massive payouts on longshot bets. Two cases. Two methods. One platform.
To summarize
• A U.S. soldier turned $33,034 into $409,881 by betting on Maduro using classified information.
• In France, abnormal spikes on a Météo France sensor generated over $35,000 in profits for Polymarket traders.
• Polymarket is currently raising funds at a $15 billion valuation despite these scandals.
$400,000 in profit
On April 23, 2026, the U.S. Department of Justice announced the indictment of Gannon Ken Van Dyke, 38, a U.S. Army soldier stationed at Fort Bragg, North Carolina.
The charges are unprecedented in crypto prediction markets.
Van Dyke allegedly accessed classified information related to Operation Absolute Resolve, a military operation targeting former Venezuelan president Nicolás Maduro.
Armed with this information, he placed 13 bets on Polymarket between December 26, 2025, and January 2, 2026, for a total stake of $33,034.
Early on January 3, U.S. special forces apprehended Maduro and his wife at their residence in Caracas. A few hours later, the operation was publicly announced.
Van Dyke walked away with $409,881 in profit.
The winnings had already made headlines in January, though his identity was not known at the time. But three days after the operation was announced, Van Dyke contacted Polymarket requesting the deletion of his account, falsely claiming he had lost access to his email address.
A critical mistake that contributed to his downfall.
He now faces five federal charges: three violations of the Commodity Exchange Act, wire fraud, and theft of non-public government information. Each CEA violation carries up to 10 years in prison. Wire fraud carries up to 20 years.
The CFTC filed its own complaint the same day.
U.S. Attorney Jay Clayton was clear: “prediction markets are not a safe haven” for the use of confidential or classified information for personal gain. This is insider trading, and it is illegal under federal law.
This is the first major alleged case of insider trading on a crypto prediction market involving U.S. government secrets.
The French scheme
The second case is even more unusual.
On April 6 and April 15, 2026, a Météo France sensor located near the runway at Paris Charles de Gaulle Airport recorded abnormal temperature spikes of more than 3°C, before returning to normal within minutes.
Polymarket traders, whose bets were tied to the daily maximum temperature in Paris, collectively earned more than $35,000.
On April 6, one trader made $14,000 with a tiny initial stake.
On April 15, the pattern was even more striking. Blockchain analytics platform Bubblemaps reported that one account bought “NO” shares on an 18°C outcome at odds below 1%, placed a $120 bet, and exited the position with a $21,000 profit in under 30 minutes, just moments after the abnormal sensor spike.
Bubblemaps highlighted the contrast with the trader’s usual behavior: their average bet is around $6 at 72% odds. This trade was 20 times larger, placed at 0.6% odds, just minutes before the anomaly.
The account that placed the winning bet on April 6 had been created only two days earlier.
Météo France has since filed a complaint for interference with an automated data processing system with the Air Transport Gendarmerie in Roissy, citing physical findings on one of its instruments and analysis of the sensor data.
Mark Roulston, a researcher specializing in prediction markets at Lancaster University, summarized the structural flaw exposed by these incidents: a single data source is likely not a good idea.
Even without malicious activity, a single station can produce faulty or abnormal readings.
Using an average across multiple stations would make these contracts much harder to manipulate.
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Polymarket under pressure, but still growing
These two cases add to a growing list of incidents.
The previous week, UFC announcer Bruce Buffer misread a result live during UFC 327 in Miami.
The error briefly pushed one fighter’s odds to 99.9%, allowing a trader to turn $500 into $252,000 before the correction happened.
On the legislative front, pressure is rising. Two U.S. senators, Adam Schiff and John Curtis, have introduced a bipartisan bill aimed at banning sports betting on platforms like Polymarket and Kalshi.
At the same time, the Trump administration is backing these platforms and has filed lawsuits against Illinois, Arizona, and Connecticut, arguing that the CFTC holds jurisdiction over the sector.
Despite all this, Polymarket continues to grow. The platform is currently in talks to raise $400 million at a valuation of around $15 billion, after already securing a $600 million investment from Intercontinental Exchange the previous month.
The question now is no longer whether Polymarket can make its users millionaires. Some have already proven that, by exploiting inefficiencies.
The real question is how far regulation will go.
Case to follow on Cryptonomic.
