Infiniti Intelligence Hourly Briefing — Oct 8, 2026 · 6:54 PM ET

Rep. James Comer has opened a formal investigation into Polymarket and Kalshi, asking the companies’ CEOs to explain their systems for identifying and preventing insider trading, according to Bitcoinist reporting carried by coinsnews.com.

The inquiry was reportedly triggered by suspicious trading associated with classified US military operations and geopolitical events. The provided report does not identify the trades or traders involved, or establish that insider trading occurred.

Scrutiny of trading safeguards

Comer’s requests focus on how the two prediction-market operators police activity on their platforms. For market participants, the central issue is whether safeguards can detect and prevent trading based on privileged information about events underlying their contracts.

The US investigation comes alongside separate regulatory challenges abroad. Although those actions involve the same platforms, the reported concerns differ: Comer is examining insider-trading protections, while Spanish authorities are pursuing alleged gambling-authorization violations.

Spain orders access blocked

According to Bitcoinist, Spain’s Directorate General for the Regulation of Gambling has begun sanctioning proceedings against Polymarket and Kalshi and ordered their websites blocked throughout Spain as a precaution while the case proceeds. The regulator alleges that both operators lack the required administrative license and expects the process to take roughly three to four months before a final decision.

Spain treats prediction markets as gambling on uncertain outcomes. Its regulator said unauthorized operators lack the required technical and regulatory assurances, including identity checks, protections against access by minors, restrictions involving self-excluded or banned individuals, and user-protection oversight.

The report also describes an exploit affecting Polymarket and a ban imposed in Indonesia on Monday following heightened attention to a wager concerning the President’s term. Indonesia’s Ministry of Communication and Digital Affairs said the restriction aimed to protect the public, particularly younger users and people active in digital environments.

What it means for prediction markets

• Market integrity is under examination: Comer’s inquiry seeks explanations of detection and prevention measures; the reported suspicious trades are not, by themselves, findings of wrongdoing.
• The regulatory issues are distinct: The US probe concerns insider-trading safeguards, whereas Spain’s proceedings concern licensing and gambling protections.
• Access restrictions are already in effect: Spain’s blocking order is precautionary pending a decision, with proceedings expected to last roughly three to four months.
• Important details remain unavailable: The supplied reporting does not specify the trades behind Comer’s investigation or provide the CEOs’ responses.

Indonesia’s Ministry of Communication and Digital Affairs blocked access to Polymarket on Monday, Oct 5, following local attention to a wager concerning the President’s term, according to reporting carried by coinsnews.com. The restriction adds to regulatory pressure on prediction-market operators across several jurisdictions.

The ministry said its action was aimed at protecting the public, particularly younger users and participants in the digital space. The supplied reporting does not specify how long the Indonesian restriction will remain in place or what conditions would allow access to resume.

Spain pursues licensing case

In Spain, the Directorate General for the Regulation of Gambling has opened sanctioning proceedings against both Polymarket and Kalshi, according to coinsnews.com. It also ordered their websites blocked nationwide as an interim measure while the case proceeds.

The Spanish authority alleges that both operators lack the required administrative license. Its position is that prediction markets constitute games of chance because users wager on uncertain future events. The regulator said unauthorized operators do not provide the required technical and regulatory safeguards, including identity checks, restrictions on minors and self-excluded or banned individuals, and user-protection oversight.

A final decision in Spain is expected after approximately three to four months. That process is separate from Indonesia’s restriction, which the ministry explained in terms of public protection.

US scrutiny focuses on trading controls

The pressure extends beyond access and licensing. According to coinsnews.com, US Representative James Comer announced a formal investigation into Polymarket and Kalshi and asked both companies’ CEOs to explain their systems for detecting and preventing insider trading. The inquiry reportedly followed suspicious trades connected to classified US military operations and geopolitical events. The outlet also reported that Polymarket had faced an exploit.

What it means for prediction markets

• Access is a jurisdiction-specific risk. Indonesia’s block affects Polymarket, while Spain’s interim restrictions cover both Polymarket and Kalshi.
• Spain’s outcome remains pending. The website blocks are precautionary measures, not the final result of the sanctioning proceedings.
• Regulatory concerns differ across markets. Indonesia emphasized public protection, Spain cited licensing and safeguards, and the US inquiry concerns insider-trading controls.
• The Indonesian timeline is unclear. The supplied reporting provides no reopening date or conditions for restoring access.