DOJ Indictment Tightens Rules for Prediction Markets

The Department of Justice has indicted Army Sgt. Gannon Ken Van Dyke on charges that he used classified information to place bets on Polymarket and netted more than $400,000 in profits. The indictment alleges Van Dyke opened a contract based on privileged information in violation of the Commodity Exchange Act. A hearing is scheduled for June 8, 2026. Van Dyke was released on bail and his attorney has announced plans to challenge the charges.

The Justice Department treats the contested event contracts on decentralized platforms as regulated swaps, which places them under Commodity Futures Trading Commission jurisdiction. Prosecutors have invoked wire fraud statutes alongside the Commodity Exchange Act, and officials say government employees are subject to the same prohibitions on trading with nonpublic information that apply in traditional markets.

Stefan Muehlbauer, head of U.S. government affairs at Certik, argued the indictment creates a legal precedent by applying the Commodity Exchange Act and wire fraud laws to decentralized event markets. He wrote that categorizing these contracts as regulated swaps extends confidentiality obligations into crypto markets and aligns criminal liability for insider trading with that of traditional securities markets.

Regulatory enforcement has also targeted market-making firms accused of inflating trading volume. Authorities have brought actions against automated operations alleged to create artificial liquidity or misleading price signals, including activity characterized as wash trading and bot-driven order books.

To reduce manipulation risk, Muehlbauer recommended technical and market-design changes. He proposed transparent order-book attribution and “proof of humanity” measures so open interest better reflects real users. He also urged economic designs that make attacks costlier than potential profits and a move from single-source price oracles to multi-source, time-weighted averages.

For contracts tied to physical data, such as weather readings, Muehlbauer advised decentralized redundancy and cryptographic attestation so no single sensor or news source can determine an outcome on its own.

Platform operators, users and legal observers are watching the June hearing for guidance on how courts will apply the Commodity Exchange Act and related fraud statutes to prediction markets. The court’s decision may affect compliance practices, contract design and user behavior across both decentralized and centralized markets.