• Spain's national gambling regulator, the DGOJ, has ordered a nationwide block against Polymarket and Kalshi while it investigates their operations.
• The precautionary ban is expected to remain in place for three to four months as the sanctions procedure runs its course.
• Under Spanish legislation, prediction markets are legally classified as gambling because users are betting on uncertain future outcomes, requiring operators to hold a specific administrative licence.
• The DGOJ initiated the blocking order and published its notification in the Official State Gazette after direct attempts to contact the US-based companies proved unsuccessful.
• Authorities have warned of significant consumer protection risks, noting that unlicensed platforms lack essential safeguards such as identity verification and age control mechanisms.

Navigating the Regulatory Landscape

Spain’s Ministry of Social Rights, Consumer Affairs, and the 2030 Agenda has aggressively targeted the prediction market sector by opening sanctions proceedings against Polymarket and Kalshi. The Directorate General for the Regulation of Gambling (DGOJ), currently chaired by Pablo Bustinduy, led the intervention, citing clear breaches of the country's gambling framework. According to official documentation, both international platforms have been offering services to Spanish residents without securing the mandatory administrative licences required by law.

In Spain, any activity that hinges on individuals staking money on uncertain future outcomes is classified as gambling. Consequently, the government has rejected the platforms' assertion that they operate simply as trading exchanges or financial instruments. The precautionary block on both websites aims to immediately halt these allegedly irregular activities while the DGOJ conducts a thorough review. This temporary measure is not a final ruling, but it effectively limits Spanish residents' access to services operating from abroad without any domestic oversight. The investigation will last between three and four months, after which the DGOJ will determine the final sanctions.

The official notification was published in the Official State Gazette (BOE) on Tuesday, 26 May 2026. This formal publication was necessitated after the Spanish government's initial attempts to contact Polymarket and Kalshi directly at their known overseas addresses failed to yield a response, ensuring the legal validity of the sanctions process under Spanish administrative rules.

The Risks of Unauthorised Operations

Polymarket and Kalshi operate as distinct marketplaces where users can buy and sell stakes tied to the outcomes of future events, ranging from political elections and international conflicts to sports and weather phenomena. Instead of betting against a traditional bookmaker, users trade directly with one another, with the platforms functioning as middlemen that facilitate the transactions and generate revenue through commissions.

Despite this peer-to-peer structure, the DGOJ has strongly emphasised the inherent risks associated with using these unauthorised networks. The regulator’s primary concern is the total absence of technical and regulatory guarantees that licensed operators are strictly required to maintain in Spain. Specifically, the DGOJ highlighted that Polymarket and Kalshi lack robust identity verification systems, presenting a severe risk to consumer safety.

Furthermore, the authorities warned that these unlicensed platforms do not possess adequate access control mechanisms to prevent minors or vulnerable individuals, such as those registered on national self-exclusion lists, from participating. The ongoing investigation is designed to clarify the full extent of the platforms' operations in the country, assign appropriate operator responsibility, and ultimately enforce compliance with Spain's rigid online gambling regulations.

The Spanish government's aggressive move against Polymarket and Kalshi represents a critical escalation in the ongoing friction between European regulators and the booming prediction market sector. By definitively classifying these platforms as gambling operators rather than financial exchanges, the DGOJ has set a clear regulatory boundary. This action aligns Spain with several other European jurisdictions, including France, Portugal, and the Netherlands, which have also moved to restrict or ban prediction markets over similar licensing concerns. The core issue lies in the fundamental architecture of these sites: while they utilise trading mechanics similar to stock derivatives, the underlying activity involves staking capital on uncertain future outcomes the very definition of gambling under European legal frameworks.

For operators like Polymarket and Kalshi, the global regulatory environment is becoming increasingly hostile. Despite achieving massive valuations and processing billions in monthly trading volume, their refusal or inability to secure local gambling licences makes their current growth trajectories highly vulnerable to state intervention. The DGOJ's successful implementation of a nationwide block without even establishing direct contact with the companies highlights the robust enforcement capabilities of modern European regulators. If prediction markets wish to maintain access to lucrative European demographics, they will eventually be forced to abandon their "financial trading" defence and submit to the strict consumer protection and licensing standards of traditional iGaming operators.

Moreover, the DGOJ's intense focus on consumer safety, specifically regarding age verification and self-exclusion mechanisms, exposes a significant weakness in the operational models of decentralised and crypto-adjacent platforms. European regulators view these safeguards not as optional features, but as fundamental prerequisites for market access. The fact that the Spanish government intervened primarily on the grounds of user protection indicates that regulatory bodies are deeply concerned about the potential for addiction and underage participation on platforms that operate outside their jurisdiction. Until prediction markets can demonstrably enforce these strict compliance standards, the wave of national bans across Europe is highly likely to continue.