On May 22, 2026, James Comer, the chair of the U.S. House Oversight and Reform Committee, threw a public letter in Washington, bringing the two prediction market platforms Kalshi and Polymarket to the forefront of Congressional hearings. According to his public statement, the committee has officially launched an investigation and sent letters to the CEOs of both companies requesting a series of internal documents and records covering measures to prevent insider trading, identity verification (KYC), regional or geographic restrictions, and mechanisms for monitoring abnormal trading. Comer specifically pointed out that these internal records would be crucial for identifying accounts that may have profited from "utilizing national security secrets," as well as for evaluating whether the platforms are fulfilling legal obligations. This means that prediction markets trading on events related to elections, macroeconomic data, and policy decisions are no longer just seen as "information aggregation tools," but are beginning to be examined by legislatures as potential domains for concealing sensitive information arbitrage activities. Although the public still does not know the specific legal grounds invoked in the investigation, or whether more regulatory bodies will follow up, this action alone is enough to declare that the prediction markets deeply intertwined with the crypto narrative are entering a new round of compliance scrutiny from Congress.

From Niche Crypto Betting to Washington's Target

In a broader financial landscape, Kalshi and Polymarket originally appeared as "crypto betting platforms" in the margins: users do not bet on the outcome of teams, but trade contracts that are simple in structure yet point to real-world events, such as election results, macroeconomic data releases, and key policy decisions. These contracts look like binary bets on the interface but are more like new types of derivatives in the regulatory context; coupled with their natural intersection with on-chain ecosystems and the crypto asset community, they quickly formed a unique market with both speculative and information-expressive attributes.

Because they occupy the overlapping territory of "event contracts," "derivative-like instruments," and "crypto trading," Kalshi and Polymarket have not been able to truly "disappear" from regulatory oversight in recent years: U.S. regulators have long expressed concerns about the commodity characteristics, contract nature, and compliance boundaries of such platforms, always focusing on one issue—when free trading is allowed on public event outcomes, how to prevent individuals from utilizing non-public significant information, including national security secrets, to achieve concealed arbitrage on these platforms. Research briefs indicate that the Congressional investigation initiated by James Comer, directly targeting Kalshi and Polymarket, marks the first time that these prediction markets, originally packaged as "marginal innovations," have been explicitly dragged into the scrutiny of the U.S. legislative body, becoming a new frontline in the game between crypto and traditional regulation.

Information Aggregation or Insider Casino?

In the official narrative of Kalshi and Polymarket, these contracts surrounding elections, macroeconomic data, policy decisions, and even war and geopolitical risks are packaged as efficient "information aggregators." The platforms assert that allowing participants from different backgrounds to bet on public event outcomes transforms the prices themselves into a collective judgment of the future, capable of condensing fragmented information dispersed among researchers, journalists, and industry insiders into a number closer to the true probability, thus enhancing the market's pricing efficiency regarding risks and policy direction.

However, in the eyes of regulators and legislators, another side hides behind this narrative: the closer a target is to the real power struggle, the more it attracts individuals who possess non-public significant information or even national security intelligence. Theoretically, those holding confidential policy drafts, military deployments, or diplomatic intelligence naturally have an advantage over ordinary speculators when trading on markets related to policy direction, war outbreak probabilities, or election processes. The risks associated with trading behavior are highly similar to the "insider risk of trading on non-public significant information" seen in traditional capital markets. It is precisely for this reason that James Comer emphasized the importance of internal records in his letter, attempting to identify accounts that "may profit from national security secrets," officially bringing national security into the debate: the research brief summarized this as a growing tension between the so-called "information aggregation" of prediction markets and their potential to devolve into tools for trading non-public information, escalating into an institutional conflict about the flow of confidential information.

Comer's Letter: What the Platforms Should Disclose

This time, Comer did not stop at macro criticism but directed his focus towards the backend systems of Kalshi and Polymarket. The letters sent to the CEOs of the two platforms primarily demand that they "reveal their cards"—disclose all internal systems and records related to preventing insider trading: from how the platform designs risk controls to the operational records kept during the execution process, all have been included in the request scope. The research brief cites a single source stating that Comer particularly emphasized that these internal records are the key basis for identifying accounts that may profit from national security secrets and judging whether the platform is fulfilling its legal obligations; in other words, he is interested not in how products are marketed, but in how trades are genuinely screened and released.

The letter lists several key areas that nearly cover the skeletal structure of prediction market compliance frameworks. The first is identity verification, namely the platform's KYC rules: how much real information users need to provide when opening accounts, withdrawing assets, or increasing positions, and how the platform retains and uses this data. The second is regional or geographical restrictions, especially the admission and prohibition standards for users in specific jurisdictions; legislators want to know whether the platform's "restrictions" on paper are truly implemented at the levels of IP, addresses, and accounts. The third is monitoring for abnormal trading, including how to identify suspicious patterns such as "abnormal winning rates" or sudden large positions, and how internal records, reports, and handling processes are triggered thereafter. Although Comer's list has already been quite detailed, the research brief simultaneously points out that the public still has no visibility into the specific legal basis cited in this investigation, the upcoming timeline, or whether regulatory bodies such as the SEC and CFTC are involved; in this moment of severe information asymmetry, these materials being requested but not yet disclosed are becoming invisible chips that could influence the direction of future regulatory narratives.

Is a Regulatory Chill Coming? The Next Steps for Prediction Markets

Once Congress brings Kalshi and Polymarket to the hearing table, this investigation is not merely a case of "investigating two companies," but rather resembles a prelude to a new set of rules. The research brief has already stated clearly—the action "marks the beginning of the U.S. legislative body's review of the compliance and trading behaviors that crypto and prediction market platforms may involve," and the very issues being questioned happen to be the most sensitive and easily formulated into written rules in traditional finance: insider trading prevention, KYC, jurisdiction limitations, and abnormal trading monitoring. If the committee ultimately abstracts these issues into "common risks of the industry" in a public forum, the next step can easily escalate from "inquiring about two companies" to requiring compliance with regulatory baselines across the entire industry, even spilling over to impact a broader structure of crypto derivatives.

From the platform's perspective, the most realistic regulatory direction may focus on three dimensions: the first is more rigid identity verification and geographic lockdowns, turning "who can participate and where they come from" into hard constraints; the second is specialized rules for politically and nationally sensitive events, extracting such contracts from ordinary events and demanding higher standards for risk control, disclosure, and pre-review; the third is to document actionable checklists on "how to prevent non-public significant information from being used to place bets," rather than just principled slogans. However, all of this is currently still at the speculative level: there are no publicly available materials showing which specific laws or clauses the investigation relies on, whether the SEC, CFTC, etc., formally intervened, let alone any penalty schemes or legislative drafts. Until the information vacuum is filled, whether regulation will center on "setting rules" or "killing samples" remains an open topic with no standard answer.

A Three-Way Game Among Projects, Traders, and Regulators

After the House Oversight Committee has named Kalshi and Polymarket, it is almost impossible for such platforms to treat the investigation as a "routine affair." On one side is the cooperation to provide internal data related to preventing insider trading, KYC, geographic restrictions, and abnormal trading monitoring to demonstrate their attempts at "playing by the rules"; on the other side is the effort to maintain market richness and user experience, preventing the loss of the native crypto user base due to excessive self-censorship. This balance is often achieved through more refined market segmentation, stricter thresholds for contracts that are highly sensitive to politics and national security, or even a comprehensive overhaul of internal risk control narratives—not to please anyone, but to present a coherent business logic that can be understood when scrutinized by Congress, rather than an opaque black box open to speculation.

On the trader's side, the signals are more direct. The Oversight and Reform Committee's public intervention itself serves as a redefinition of the "information boundary," especially when the investigation's focus is clearly directed toward insider trading and national security information risks. Any contracts related to public event outcomes will be tagged with more sensitive compliance labels. In financial history, regulatory uncertainty almost inevitably leads to a wait-and-see sentiment and a phase of liquidity contraction, and this time is no exception: some participants will proactively avoid high-sensitivity markets related to elections, defense, or geopolitical conflicts and shift their positions to more "technical" economic data contracts; while others, continuing to trade, will begin to reassess the boundaries of their information sources, fearing that a piece of "insider news" could later be interpreted as a clue to misconduct. For the entire crypto prediction market industry, this Congressional investigation effectively forces everyone to answer one question: how much gray area of innovation should they strive to survive in the future, which contract designs, risk control mechanisms, and user profiles must be pushed to clearer red lines, and every party's misjudgment about this line will be magnified into structural costs in the coming cycles.

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