US House expands probe into prediction markets

TLDR

US lawmakers are widening an insider?trading investigation around prediction markets that now reaches deeper into crypto trading platforms.

1. The House Oversight Committee is seeking detailed records from Hyperliquid, Crypto.com, and PredictIt, building on earlier probes into Polymarket and Kalshi.
2. Lawmakers are focused on whether event and crypto venues can prevent trading based on nonpublic information, which could push stricter KYC, surveillance, and access limits.
3. The next signals to watch are how these firms respond, whether hearings follow, and if Congress moves toward new rules for prediction markets and event contracts.

Deep Dive

1. What The House Is Doing Now

Chairman James Comer of the House Oversight Committee has expanded an investigation into potential insider trading on prediction markets to three more platforms: Hyperliquid Labs, Crypto.com, and Aristotle Exchange, which operates PredictIt. Reports describe letters requesting detailed records on customer identity checks, internal monitoring, and how suspicious trading is reported to authorities, extending a probe that already covered Kalshi and Polymarket since May. In several articles, the committee cites examples such as a large leveraged Hyperliquid short position opened shortly before a nonpublic U.S. tariff announcement and earlier cases involving geopolitical and political event contracts on Polymarket and Kalshi, as described in TokenPost coverage.

2. Why This Matters For Crypto And Prediction Markets

Prediction markets and some derivatives venues sit in a gray area between regulated futures trading and gambling law, and they increasingly use crypto rails. The investigation asks how platforms verify users, enforce geographic restrictions, and flag trades that might rely on classified or nonpublic government information, according to reports from outlets such as CryptoBriefing. If lawmakers conclude that current controls are weak, they could push for tighter rules that make it harder for lightly KYCed or offshore style markets to serve U.S. users. That could affect contract availability, leverage, and even the business model of on chain event markets.

3. What To Watch Next

The letters reportedly seek records back to early 2024 and set a near term response deadline. The committee has already received about 1,000 documents and multiple briefings from Polymarket and Kalshi, suggesting this is an active, not symbolic, inquiry. Possible next steps include public hearings, new legislative proposals that restrict who may trade on certain contracts, or clearer expectations around KYC and surveillance for prediction venues, as summarized in The Defiants report. For users, key signals will be any changes to U.S. access, leverage limits, or contract listings on the named platforms.

Conclusion

The expanded House probe shows that prediction markets and crypto linked event trading are moving into the center of Washingtons market integrity debates. The focus is less on shutting them down today and more on whether they can prevent trading on privileged information. How Hyperliquid, Crypto.com, PredictIt, and earlier targets like Polymarket and Kalshi respond, and whether Congress follows up with hearings or new legislation, will shape how accessible and heavily regulated this niche of the crypto market becomes.