TLDR
US lawmakers have opened a major insider trading investigation into Kalshi and Polymarket, focusing on whether government insiders used classified information to profit on prediction markets.
- House Oversight Chair James Comer is demanding internal records from Kalshi and Polymarket after suspiciously timed bets around Iran and Venezuela and a case of a US soldier making over $400,000 on Polymarket.
- The probe tests whether traditional material nonpublic information rules should apply to prediction markets, as volumes hit about $51 billion a year and national security and gambling harms become key concerns.
- Key next steps are the June 5 deadline for platform disclosures and potential bills to ban government employees from prediction markets and restrict war or assassination contracts, which could reshape crypto prediction markets.
Deep Dive
1. What Congress Is Investigating
The US House Oversight Committee, chaired by Rep. James Comer, has launched a formal investigation into prediction market platforms Polymarket and Kalshi over fears that government employees may be trading on classified information. Comer has sent document requests to both CEOs, asking for details on identity verification, geographic restrictions, and systems that flag anomalous trades by June 5, 2026 %%CKPROTECTED0%%.
The move follows a series of incidents, including a US Army master sergeant charged with using classified intelligence about an operation involving Venezuelan president Nicols Maduro to earn over $400,000 on Polymarket contracts, and more than 80 unusually successful bets tied to US and Israeli military actions against Iran soldier case and 80 trades. Kalshi has separately suspended and fined congressional candidates for betting on their own elections.
Congress is not targeting casual retail traders directly, but is probing whether these platforms have enough controls to stop people with privileged information from exploiting them.
2. Why This Matters For Crypto Prediction Markets
Legally, the core issue is whether trading on material nonpublic information, already a felony in securities markets, should be treated the same way on prediction markets that sit in a regulatory gray zone MNPI framing. If Congress codifies that standard, crypto prediction markets would face insider trading rules much closer to stock and derivatives venues.
At the same time, prediction markets have grown quickly, with annual volumes around $51 billion in 2025 and projections of $240 billion in 2026 and up to $1 trillion by 2030 volume projections. Lawmakers are framing the issue not just as market fairness, but as national security and gambling risk, highlighting how anonymous crypto markets can let insiders or foreign actors quietly monetize sensitive information national security concerns.
For crypto users, this increases the odds that prediction markets get pulled into a stricter, more traditional regulatory regime, especially around identity checks and sensitive event types.
3. What To Watch Next As A User
First, the June 5 deadline for Kalshi and Polymarket to deliver compliance records will be an important signal of how cooperative they are and how serious Congress is about follow up deadline detail. Any public summaries or hearings after that could preview concrete rule changes.
Second, several legislative ideas are already circulating, including proposals to explicitly bar members of Congress and federal employees from using prediction markets when they have access to relevant nonpublic information, and separate efforts to ban contracts related to war, terrorism, assassination, or individual deaths on regulated venues DEATH BETS Act context. The Senate has also moved toward banning senators and staff from trading on these platforms altogether Senate ban move.
In practice, users should expect tighter KYC, more aggressive surveillance of trading patterns, potential geoblocking, and possibly delisting of some geopolitical or violence related markets if lawmakers push ahead.
If you use crypto prediction markets, the main risks are not just price swings, but changing access, stricter identity requirements, and the possibility that some markets or user groups get shut out entirely.
Conclusion
The congressional probe into insider trading on Kalshi and Polymarket links crypto prediction markets directly to debates about national security, gambling harm, and classic insider trading law. How these platforms respond, and whether Congress follows with bans for officials or limits on sensitive markets, will determine whether prediction markets evolve into more regulated financial infrastructure or face tighter restrictions that cap their growth and accessibility.
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