Polymarket and Kalshi Tighten Rules to Fight Insider Trading as Political Heat Rises
Prediction platforms Polymarket and Kalshi are rolling out new safeguards aimed at curbing insider trading, responding to growing political and regulatory pressure on the fast‑expanding prediction market industry.
Both companies revealed changes on Monday: Polymarket has updated and expanded its integrity rules, while Kalshi is introducing new tooling and controls. Together, these moves are designed to make it harder for traders with non‑public information to profit unfairly-and to signal to regulators that the firms are serious about market integrity.
The reforms arrive at a tense moment. A number of Democratic lawmakers have recently zeroed in on prediction markets, arguing that some contracts-especially those tied to war, geopolitical conflict, and other sensitive events-are unethical or destabilizing. Several have pushed to ban specific types of markets outright, framing them as a form of gambling on human suffering rather than a legitimate forecasting tool.
Polymarket sharpens its rulebook
Polymarket’s latest update centers on its integrity framework, which governs what users can and cannot do on both its decentralized finance (DeFi) platform and its U.S. service, which operates under oversight from the Commodity Futures Trading Commission (CFTC).
The firm has now explicitly spelled out various forms of insider trading that are banned. That includes trading on material non‑public information, acting on illegally obtained tips, or using privileged access to government or corporate data to place advantageous bets. By moving these prohibitions from implicit expectations to clearly articulated rules, Polymarket is trying to remove ambiguity about what qualifies as misconduct.
According to the company, the goal is to ensure that every participant-whether a casual user or a professional trader-understands that markets must be based on publicly available information and legitimate research, not secret briefings or leaked documents. The updated rules emphasize that even the perception of unfair informational advantages can damage trust and deter honest participants.
Polymarket also highlighted its compliance infrastructure, underscoring that it is investing in surveillance, monitoring, and enforcement tooling to spot suspicious trading patterns. While details remain limited, the message is that the platform is moving closer to the kind of surveillance common in traditional financial markets, rather than relying solely on the ethos of open crypto experimentation.
Kalshi leans on tooling and monitoring
Kalshi, which operates as a regulated event contracts exchange in the United States, is focusing its latest efforts on technical and operational defenses. The company is enhancing its internal tools to analyze trading flows, flag abnormal behavior, and correlate trades with the timing of sensitive announcements or data releases.
In practice, that means using analytics to identify traders whose performance strongly suggests they had knowledge that was not yet available to the general public. Sudden, concentrated positions placed immediately before major policy decisions, corporate announcements, or macroeconomic data releases are likely to face scrutiny under these new systems.
By bolstering its tooling rather than solely revising public rules, Kalshi is signaling that enforcement will be proactive, not just reactive. Traders may never see all of the mechanisms in place, but the risk of being detected and sanctioned for misusing inside information is increasing.
Rising scrutiny from Washington
The timing of these upgrades is not accidental. Prediction markets, once a niche corner of the internet, have attracted substantial attention as their volumes have surged and their topics have expanded from elections to a wide range of social, economic, and geopolitical outcomes.
Lawmakers-especially on the Democratic side-have expressed alarm about markets that allow people to profit from war, natural disasters, or civil unrest. Some argue that such markets are inherently exploitative, while others worry that financial incentives could theoretically influence real‑world behavior or decision making.
There is also unease that prediction platforms might be used as a channel for monetizing privileged government information. Staffers, contractors, or officials with early access to policy decisions or intelligence could, in theory, quietly place trades and turn that knowledge into profit. That potential has made insider trading a focal point for critics.
As a result, prediction market operators increasingly find themselves pulled into the same regulatory debates that have long surrounded derivatives, gambling, and financial speculation. By tightening rules and showcasing compliance efforts, Polymarket and Kalshi are attempting to position themselves as responsible actors rather than outlaws on the edge of finance and politics.
Why insider trading is especially sensitive in prediction markets
Insider trading has always been a concern in traditional financial markets, but prediction markets present a different twist. Instead of trading stocks or bonds, participants are betting on the outcome of real‑world events: elections, court decisions, policy changes, macro data releases, and more.
This structure means that the people most likely to hold material non‑public information are often public officials, civil servants, journalists, campaign staffers, or employees at data‑producing institutions. If those individuals use their positions to trade, it can create a direct conflict between public duty and private gain.
Furthermore, if users suspect that well‑connected insiders are dominating certain markets, they may simply stop participating, undermining the crowdsourced intelligence that makes prediction markets valuable in the first place. For platforms that rely on depth and diversity of opinion, even the perception of unfairness can be costly.
By codifying strict prohibitions and building surveillance tools, Polymarket and Kalshi aim to reinforce the idea that their markets should reflect collective expectations, not the secret knowledge of a few.
Balancing innovation with regulation
Both firms are walking a tightrope: they want to preserve the open, information‑aggregating power of prediction markets while satisfying regulators that they are not enabling unlawful activity. That balancing act is particularly challenging because the legal status of many kinds of event markets remains unsettled, and political views on them are sharply divided.
On one side, advocates argue that prediction markets generate highly accurate forecasts, support better decision making, and offer a transparent signal about public expectations. On the other side, critics see them as a new form of speculation that could distort policy, encourage unethical behavior, or simply turn serious issues into betting fodder.
By preemptively strengthening internal rules and systems, Polymarket and Kalshi appear to be betting that robust self‑regulation will help preserve space for innovation. If they can demonstrate that insider trading is aggressively policed and that certain controversial contracts are handled responsibly, they may be better positioned in ongoing discussions with regulators and policymakers.
Implications for traders and users
For everyday users, these moves mean the environment on major prediction markets is likely to feel more like a regulated financial venue and less like an experimental crypto playground. Traders can expect:
– Clearer terms of service around what counts as prohibited insider behavior
– A greater likelihood that unusual trades will be reviewed and, if necessary, reversed
– Potential account suspensions or bans for those suspected of misusing private information
– More emphasis on compliance checks, especially for high‑volume or highly successful accounts
At the same time, these changes could benefit legitimate participants. If users gain confidence that markets are not being quietly dominated by insiders, they may be more willing to commit capital and rely on prices as meaningful indicators of collective belief.
The broader future of prediction markets
The recent steps by Polymarket and Kalshi are unlikely to be the last. As regulatory attention focuses more intensely on this sector, other platforms may follow with their own rule updates, monitoring tools, or restrictions on certain types of markets.
Several questions loom large for the industry:
– How far will regulators go in defining which events can be legally traded?
– Will policymakers treat prediction markets more like derivatives exchanges, like casinos, or as a unique category?
– Can platforms successfully police insider trading when the “assets” being traded are real‑world events rather than traditional securities?
The answers will help determine whether prediction markets remain a niche product, evolve into mainstream financial instruments, or become heavily constrained by law.
A strategic move in an uncertain environment
For now, Polymarket and Kalshi are sending a clear message: insider trading will not be tolerated, and both platforms are willing to invest in the systems and rulebooks required to prove that. Whether that will be enough to appease skeptical lawmakers-especially those calling for bans on war‑related or similarly sensitive markets-remains to be seen.
What is evident is that the industry has entered a new phase. As volumes grow and the stakes rise, prediction markets are being forced to professionalize. The recent measures against insider trading are less a cosmetic change than a sign that these platforms see themselves as long‑term players in a regulated environment, not temporary experiments hoping to fly under the radar.