US Congress probes crypto prediction markets

TLDR

US lawmakers are investigating whether crypto-linked prediction markets enable insider trading and have adequate safeguards.

1. The House Oversight Committee has opened and expanded probes into Kalshi, Polymarket, Hyperliquid, Crypto.com and PredictIt over potential insider trading and weak controls.
2. The focus is on traders allegedly using nonpublic information about wars, tariffs and politics, which could push platforms toward stricter KYC, surveillance and product limits.
3. Over the next months, platforms responses and any new legislation or bans on officials trading could reshape how prediction markets operate for US and global users.

Deep Dive

1. What Congress Is Investigating

The House Oversight Committee, chaired by Rep. James Comer, has launched an investigation into prediction markets like Kalshi and Polymarket, then expanded it to Hyperliquid Labs, Crypto.com and Aristotle Exchanges PredictIt platform.

Letters to these firms request detailed records on customer identification, geographic restrictions, and how they detect and report suspicious trades, covering activity back to January 2024, with deadlines around mid?October.

The probe is explicitly framed around potential insider trading on event contracts, and builds on an earlier phase where Kalshi and Polymarket already provided nearly 1,000 documents and several briefings to lawmakers.

2. Why It Matters For Crypto Users

Lawmakers cite several examples where traders allegedly used nonpublic information, including a US Army sergeant accused of using classified intel to earn around $400,000 on Polymarket, and a roughly $1.1 billion leveraged short on Hyperliquid opened shortly before new US tariffs that reportedly netted over $150 million in profit.

Regulators like the CFTC have already said that trading event contracts with misappropriated nonpublic information can violate commodities law, so the investigation is about whether platforms enforce those rules in practice, especially for geopolitical and policy markets.

If Congress concludes controls are weak, the most likely outcomes are tougher KYC, stricter surveillance, narrower market listings and possibly more limited access for US users, rather than an immediate blanket ban on prediction markets.

3. What To Watch Next

Several letters set specific dates for platforms to respond, after which the Committee can hold hearings, issue reports or propose legislation, including possible bans on trading by government officials or tighter rules for event contracts.

Any public responses by Hyperliquid, Crypto.com, Kalshi or Polymarket explaining their surveillance, referrals to regulators and internal policy changes, along with updates from agencies like the CFTC, will be key signals for how hard this scrutiny bites.

For traders and builders, the main indicators will be: new or delisted markets involving policy and geopolitics, changes in US access, and whether Congress moves toward a broader legal framework for prediction markets rather than case?by?case enforcement.

Conclusion

Congresss probe into crypto prediction markets is primarily about insider trading safeguards and governance, not yet a direct shutdown of the sector.

How platforms document their controls and how lawmakers respond will determine whether prediction markets evolve into more regulated, institution?friendly tools or face tighter limits that constrain retail and crypto?native participation.