US House expands probe into prediction markets

TLDR

The US House Oversight Committee has widened its insider?trading investigation into prediction markets to include several crypto?linked platforms.

1. Lawmakers are now demanding records from Hyperliquid, Crypto.com and PredictIt, building on an earlier probe into Polymarket and Kalshi that already produced hundreds of documents.
2. The focus is on whether these venues have strong enough KYC, geo?blocking and trade surveillance to stop users exploiting nonpublic information on political, macro and geopolitical events.
3. The inquiry could lead to tighter rules, including possible trading restrictions for US officials and stricter oversight of crypto prediction and derivatives platforms.

Deep Dive

1. What The House Is Investigating

House Oversight Chair James Comer has expanded a congressional investigation into potential insider trading to request detailed records from Hyperliquid Labs, Crypto.com and Aristotle Exchange, which operates PredictIt.

This follows a May probe into Polymarket and Kalshi, where the committee has already received nearly 1,000 documents and several briefings.

Letters sent to the new targets seek information on customer identification, geographic restrictions, internal monitoring and how suspicious trades are reported to regulators or law enforcement.

Examples driving the scrutiny include allegations that a US Army master sergeant used classified intelligence to earn about $400,000 on Polymarket, and a roughly $1.1 billion leveraged short on Hyperliquid opened shortly before a nonpublic US tariff announcement, reportedly netting more than $150 million. These remain allegations, not proven violations.

2. Why It Matters For Crypto And Prediction Markets

Many of the named venues are crypto native or closely tied to crypto infrastructure, so their policies may become a template for how event contracts and prediction markets are expected to operate.

Congress is testing whether current KYC, geo?fencing and surveillance are enough to stop traders using confidential information about elections, regulation, war or tariffs on platforms that often settle in crypto or run on blockchains.

At the same time, regulators like the CFTC have already said that using misappropriated nonpublic information in these markets can violate commodities law, so congressional pressure increases the risk of coordinated enforcement against weak controls.

3. What To Watch Next

The letters ask for records covering activity since early 2024 and set deadlines in mid?October for responses, which could be followed by public hearings or further document demands.

Lawmakers are openly considering potential legislation, including limits or outright bans on government officials trading event contracts where they may have an informational edge.

For users and builders, key signals will be whether platforms tighten access rules, restrict certain event types, or shift more aggressively offshore, and whether Congress pushes for clear federal prediction?market rules rather than case?by?case fights.

Conclusion

US lawmakers are treating crypto?linked prediction markets as a live insider?trading risk and are now pulling both pure prediction venues and broader crypto platforms into the same spotlight. The outcome could either be clearer, more institutional?friendly rules or a tougher environment for lightly regulated on?chain prediction markets, depending on how platforms respond and whether Congress moves toward constructive legislation or primarily punitive restrictions.