Polymarket challenges €420,000 KSA penalty in The Hague
The prediction market operator is contesting a fine from the Dutch gambling authority for unlicensed activity, a case that underscores the growing international debate over how to regulate such platforms.
- Polymarket is appealing a €420,000 fine issued by the Dutch regulator, Kansspelautoriteit (KSA), for offering unlicensed gambling.
- The penalty relates to a one-day delay in blocking Dutch consumers, which the operator attributes to technical implementation factors.
- The legal challenge highlights divergent regulatory approaches to prediction markets in the Netherlands, wider Europe, and the United States.
Prediction market Polymarket has initiated a legal appeal in The Hague against a €420,000 (£365,000) penalty imposed by the Dutch gambling authority, Kansspelautoriteit (KSA). The regulator fined the operator after blacklisting it at the start of 2026 for providing unlicensed gambling services to consumers in the Netherlands.
The KSA had issued a warning to Polymarket’s parent company, Adventure One, demanding it block local access to its services by 17 February. Although Polymarket complied with the order, the KSA notified Adventure One in May that it would enforce the financial penalty because the platform was officially withdrawn on 18 February, one day after the deadline.
The regulator publicised the penalty notice in June and indicated it would begin recovery actions as Adventure One had not paid the fine. In its defence, Adventure One QSS Inc. stated that work on the geo-block commenced on 18 February. The company claimed that technical factors inherent to the rollout process meant some access was still possible during the testing phase.
a known feature of the technology
The company also stated that "measures were implemented as quickly and carefully as possible within the short grace period." The KSA, however, dismissed this explanation. The legal challenge, which was revealed to news outlet FD, now brings the dispute before the Dutch courts.
Regulatory divisions on display
The case highlights deep divisions on how to classify and regulate prediction markets. Within the Netherlands, the KSA explicitly defines prediction market offers as a form of gambling. A recent motion submitted to the House of Representatives by MP Iem Al Biyati, which proposed creating a separate regulatory framework for these products, was rejected by State Secretary Claudia Van Bruggen.
This stance contrasts with other European jurisdictions. Gibraltar recently established the world’s first dedicated regulatory framework for prediction markets, while Malta has indicated it may move in a similar direction. At an industry level, fellow US-based operator Kalshi noted at the SBC Summit that it is engaged in active discussions with EU-level bodies, including the European Securities and Markets Authority (ESMA).
The regulatory landscape is equally fragmented in the United States, where both Polymarket and Kalshi originated. At a federal level, the Commodity Futures and Trading Commission (CFTC) regulates their event contracts as financial instruments. However, this classification has been rejected by several major states, including New York, Arizona, Massachusetts, and Minnesota.
The debate in the US has been intensified by recent controversies. Heather Maurer, Executive Director of the National Council on Problem Gambling (NCPG), is set to step down on 16 October after just ten months in the role. Her departure follows a contentious $2 million partnership between the NCPG and Kalshi, which prompted the gambling control boards of Ohio and Michigan, along with the Nevada Council on Problem Gambling, to sever ties with the national body. The situation has been further complicated by a recent case involving a self-excluded US bettor who reportedly lost thousands of dollars on the Kalshi platform.
