“It’s just an interface to a blockchain protocol.” The Dutch regulator didn’t buy it, and Polymarket’s appeal has failed.
The Dutch regulator KSA has rejected Polymarket’s appeal against a sanction for offering illegal gambling to Dutch users. In a 23 June ruling, it upheld its January decision. KSA found that blockchain technology and decentralised protocols do not exempt an operator from Dutch gambling law. Penalties began accruing after a missed compliance deadline.
- The Polymarket Ruling
- The Decentralisation Defence
- Why KSA Rejected It
- Europe’s Prediction Market Divide
Polymarket has lost its appeal against a Dutch illegal gambling sanction. The Kansspelautoriteit, or KSA, rejected the challenge from operator Adventure One QSS Inc. It published the ruling on 23 June, upholding its original January decision. According to the KSA, the platform gave Dutch users a chance to compete for prizes by wagering on future events. That meets the statutory definition of gambling under Dutch law. Adventure One faces a financial penalty unless it winds down Dutch operations. Penalties have been accruing automatically since a missed deadline. The case tests whether blockchain architecture can shield a betting platform from gambling regulation.
The Polymarket Ruling
The timeline shows a firm regulatory hand. KSA issued its original sanction in January. It gave Adventure One a four-week grace period to close the Dutch offering. The compliance deadline fell on 17 February. The operator missed it. It implemented IP-blocking measures only the following day. As a result, penalties began accruing automatically. Adventure One appealed in March, also seeking reimbursement of its legal costs. It disputed that its offering constitutes gambling. It holds no Dutch gambling licence. On 23 June, KSA published its new ruling upholding the sanction. Dutch law is unusually broad here. It classifies event betting, covering political and other non-sport outcomes, as gambling alongside traditional sports betting. Both require licensing. Our report on the KSA’s means-test rules covers the regulator’s wider tightening.
The Decentralisation Defence
Adventure One built its case on architecture. It argued its platform is merely an interface to an open-source blockchain protocol, Polygon. On that account, users trade peer-to-peer positions using crypto wallets. An external oracle validates the outcomes. The operator, on this reading, does not run a betting book at all. It also argued the product is regulated as a financial instrument in some cases. That claim gained some support recently. The EU’s financial regulator ESMA issued a statement clarifying that certain contracts fall under existing binary options restrictions. So the classification question is not frivolous. Adventure One additionally challenged the sanction on legal grounds. It called the order disproportionate, legally uncertain, and inadequately motivated. It objected to publication of the remedial order, framing it as unfair naming and shaming. Prediction markets’ rapid growth features in our report on iGaming trends in 2026.
Why KSA Rejected It
The regulator went to substance over structure. According to KSA, an element of chance existed beyond participants’ decisive influence. That marks the activity as gambling under Dutch law. The technology used is beside the point. Blockchain, crypto wallets, and decentralised protocols grant no exemption. KSA also cited Polymarket’s own marketing. Promotional materials used the word “betting” outright. One tagline invited users to profit from their knowledge by betting on future events. Wagering on political events is specifically prohibited under Dutch gambling law. KSA’s original investigation found the platform was effectively aimed at Dutch users. Registration was open to Dutch IP addresses. Customer service included a Dutch-language AI chat function. Users could bet on markets tied to Dutch politics and sporting figures. However, the regulator also dismissed every procedural challenge. It said it had communicated the legal basis clearly, invited submissions, and reasoned its decisions properly. It defended publishing the order under the Dutch Open Government Act Polymarket, citing consumer protection, transparency, and deterrence.
Europe’s Prediction Market Divide
The ruling exposes a widening European split. Regulators disagree on how to classify decentralised prediction markets. Gambling authorities see event wagering. Financial regulators see derivative contracts. ESMA’s binary options statement pulls in one direction, and KSA’s ruling in another. However, the enforcement side is consolidating. Nine European regulators announced a joint initiative last month to crack down on unlicensed prediction markets. Their unified statement flagged consumer protection and market integrity risks. The concern centres on platforms operating without local gambling licences. As a result, the decentralisation defence faces coordinated pressure across the bloc. Trade coverage of these enforcement moves, including AGBrief, tracks how regulators are responding. The Dutch case may set an early precedent. The offshore and unlicensed-market enforcement theme also runs through our report on South Africa’s site-blocking proposal.
Frequently Asked Questions
What did the Dutch regulator decide about Polymarket?
The Kansspelautoriteit rejected an appeal by Adventure One QSS, Polymarket’s operator, and upheld a January sanction for offering illegal gambling to Dutch users. In its 23 June ruling Polymarket, the regulator found blockchain technology grants no exemption from Polymarket Dutch gambling law. Penalties accrue unless the operator winds down Dutch activity.
Why is Polymarket considered gambling in the Netherlands?
Dutch law treats event betting, including wagers on political and other non-sport outcomes, as gambling requiring a licence. According to KSA, the platform let users compete for prizes on future events, with chance beyond participants’ decisive influence. Wagering on political events is specifically prohibited under Dutch gambling law.
What was the operator’s defence?
Adventure One argued its platform is merely an interface to the open-source Polygon blockchain, where Polymarket users trade peer-to-peer using crypto wallets and an external oracle validates outcomes. It also claimed the product is regulated as a financial instrument in some cases, pointing to ESMA’s statement on binary options restrictions.
Does blockchain exempt platforms from gambling law?
Not in the Netherlands. KSA ruled that the involvement of blockchain technology, crypto wallets, or decentralised protocols does not exempt an operator from Dutch gambling laws. The regulator focused on whether an element of chance existed beyond participants’ decisive influence, rather than on the platform’s technical architecture.
How did KSA show the platform targeted Dutch users?
The regulator’s investigation found registration was available to Dutch IP addresses and customer service featured a Dutch-language AI chat function. Users could also bet on markets specifically tied to Dutch politics and sporting figures. KSA additionally cited promotional materials using the word “betting” in their taglines.
Are European regulators aligned on prediction markets?
Not fully. Gambling authorities treat event wagering as gambling, while financial regulators may classify certain contracts as financial instruments. However, nine European regulators announced a joint initiative last month against unlicensed prediction markets, citing consumer protection and market integrity risks, signalling coordinated enforcement despite classification differences.
This article has been thoroughly researched and reviewed by the CasinoBait editorial team to ensure accuracy and relevance for Asian casino players.
