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Polymarket’s Dutch Appeal: What the €420,000 Fine Means for Prediction Markets in Europe

By jili tutorial · October 6, 2026

Polymarket’s Dutch Appeal: What the €420,000 Fine Means for Prediction Markets in Europe

Introduction: A Landmark Penalty Tested in Court

Prediction market platform Polymarket is now fighting a €420,000 (£365,000) fine in The Hague, after the Dutch gambling authority Kansspelautoriteit (KSA) ruled that the platform was offering unlicensed gambling services to consumers in the Netherlands. The appeal marks one of the most significant legal challenges yet for prediction markets in Europe — a sector that is still struggling to find a clear regulatory home.

To understand what is at stake, this guide breaks down the timeline of the case, the legal arguments involved, the broader European regulatory position, and the parallel debates taking place in the United States.

Background: What Are Prediction Markets?

Prediction markets allow users to buy and sell contracts whose payouts are tied to the outcome of future events, such as elections, sports results, or economic indicators. Platforms like Polymarket and Kalshi argue that these are not gambling products but event-based financial instruments. Regulators in many jurisdictions, however, are not convinced.

In the Netherlands, the KSA has explicitly stated that prediction markets fall under gambling law. This classification is the foundation of the current penalty against Polymarket.

The Case Timeline: From Warning to Appeal

January 2026: The KSA Blacklists Polymarket

At the beginning of 2026, the KSA officially added Polymarket to its blacklist. The authority accused the platform of “offering unlicensed gambling services” to Dutch consumers. The KSA warned Polymarket’s parent company, Adventure One, that it would face financial penalties unless the platform blocked access to its services for Dutch users by 17 February.

February 2026: Compliance and the 18 February Withdrawal

Polymarket did eventually comply with the order, but the details became the centre of the dispute. The KSA had required a block by 17 February. Polymarket officially withdrew from the Dutch market on 18 February — one day after the deadline.

From the KSA’s perspective, this one-day delay justified enforcing the warning. In May, the KSA told Adventure One that it would proceed with the penalty despite the eventual block.

June 2026: The Fine Becomes Public

In June, the KSA published the official notice. It confirmed that it was moving towards recovery and enforcement actions because Adventure One had not paid the €420,000 penalty.

Polymarket’s Defence: A Technical Delay, Not Negligence

Adventure One responded by explaining that the block process had already begun on 18 February. During the testing phase, the platform still allowed some access to the service. The company said this was due to technical limitations while the full block was being rolled out.

“Adventure One QSS Inc. states that this is not negligence, but a known feature of the technology, and that the measures have been implemented as quickly and carefully as possible within the short grace period.”

The KSA rejected this explanation. Polymarket then launched a legal appeal in The Hague, as reported by Dutch financial news outlet FD.

The case hinges on a fundamental regulatory question: should prediction markets be treated as gambling or as financial services?

In the Netherlands, the KSA has taken a firm position that prediction markets constitute gambling. This means any platform offering such products to Dutch consumers without a local gambling licence is breaking the law. Polymarket does not hold a Dutch gambling licence, and its parent company has argued that the compliance effort was genuine, even if the final technical block landed a day late.

The appeal will likely focus on two issues:

  1. Did Polymarket take reasonable steps to comply?
  2. Was the one-day delay caused by intentional non-compliance or unavoidable technical rollout issues?

Dutch Politics: A Push for a Separate Framework

While the KSA is enforcing gambling law, there are signs that Dutch politicians are beginning to question whether that classification is appropriate.

A motion was submitted to the House of Representatives by Dutch MP Iem Al Biyati, proposing a separate regulatory framework for prediction markets. The motion was ultimately turned down by State Secretary Claudia Van Bruggen, who pointed to the KSA’s explicit view that such offers constitute gambling.

Still, the very existence of the motion shows that the political conversation is evolving. Even if the current legal position is clear, the door for future regulatory change has not fully closed.

European Regulators: Slowly Opening the Door

The Netherlands is not the only European jurisdiction thinking about prediction markets. Across the continent, most regulators have so far kept their doors closed. But there are notable exceptions and developments:

Gibraltar Leads the Way

Gibraltar has adopted what is described as the world’s first dedicated regulatory framework for prediction markets. This gives platforms a clear legal path to operate in that jurisdiction, setting a potential template for others.

Malta Shows Interest

Malta, already known as a hub for iGaming and financial services, has hinted that it may be moving in a similar direction. If Malta follows through, it could become another European base for prediction market operators.

Kalshi Engages with EU Regulators

Kalshi, Polymarket’s biggest global competitor, has confirmed that it is in active talks with key EU-level regulators, including the European Securities and Markets Authority (ESMA). This suggests that the sector is seeking recognition at the highest regulatory level in Europe.

For prediction market platforms, Europe remains a patchwork of approaches. Some countries enforce gambling law strictly, others are exploring bespoke frameworks, and a few are open to treating these products as financial instruments.

The US Perspective: Regulated but Controversial

Both Polymarket and Kalshi originate in the United States, where their event contracts are regulated at the federal level by the Commodity Futures and Trading Commission (CFTC) as financial instruments. That classification gives them legal status on a national level, but it has not ended the debate.

State-Level Rejection

A number of major US states — including New York, Arizona, Massachusetts, and Minnesota — have openly rejected the financial labels used by prediction markets. These states view prediction markets as a form of gambling and have taken steps to restrict them at the local level.

Tensions Within the Gambling Industry

There is also a significant amount of criticism from US gambling stakeholders who believe prediction markets should be subject to gambling regulation. This tension is not just theoretical — it has begun to affect industry relationships.

The NCPG and Kalshi Controversy

The National Council on Problem Gambling (NCPG) recently announced that its Executive Director, Heather Maurer, will step down on 16 October after only 10 months in the role. Neither Maurer nor the NCPG has given an official reason for her departure.

The timing, however, has drawn attention. The resignation comes months after the NCPG accepted a $2 million partnership with Kalshi. That partnership was highly controversial in the gambling harm prevention community.

Several state and regional bodies — including the Ohio Casino Control Commission, the Nevada Council on Problem Gambling, and the Michigan Gaming Control Board — broke away from the NCPG after the Kalshi announcement. Their departures signal that the relationship between problem gambling organisations and prediction market platforms is deeply strained.

Self-Exclusion and Player Protection Questions

Another recent case has added to the pressure. A self-excluded US bettor allegedly lost thousands of dollars on Kalshi, raising serious questions about how prediction market platforms handle self-exclusion obligations and responsible gambling safeguards.

For an industry trying to expand in Europe, this reputational baggage matters. Regulators and gambling harm charities in Europe are watching closely.

What to Watch Next

Polymarket’s appeal in The Hague is being closely observed for several reasons:

At the same time, the US debate over self-exclusion, state-level restrictions, and industry partnerships will continue to shape the public image of prediction markets.

Final Thoughts

Prediction markets are at a crossroads. In Europe, they face enforcement actions like the Polymarket penalty, but also forward-looking regulatory experiments in Gibraltar and Malta. In the US, they enjoy federal recognition as financial instruments, yet face bitter opposition from state regulators and problem gambling advocates.

For platforms like Polymarket and Kalshi, the challenge is not simply legal compliance — it is building a regulatory and reputational framework that can survive scrutiny on both sides of the Atlantic. The Dutch appeal will be an early test of whether that is possible.