Summary:

Spain has blocked access to Polymarket and Kalshi while authorities investigate possible gambling law violations.
Regulators say both platforms may be operating without required Spanish gambling licenses.
The temporary restriction is expected to remain in place for three to four months while legal proceedings continue.
Officials warned that unlicensed operators lack required user protections, including age checks and identity verification systems.
Spain joins a growing list of countries restricting prediction markets, including Indonesia, France, Australia, Singapore, Poland, Ukraine and Switzerland.
The move comes as prediction market platforms face growing pressure globally, including insider trading probes in the United States.

Spain has become the latest country to restrict access to major prediction market platforms, ordering a temporary nationwide block on Polymarket and Kalshi as authorities investigate whether the companies violated Spanish gambling law. The order was announced Tuesday by Spain's Directorate General for the Regulation of Gambling (DGOJ), which confirmed that the Ministry of Social Rights, Consumption, and Agenda 2030 had opened formal legal proceedings against both firms. Prediction markets involve users placing money on uncertain future events, and under Spanish law that activity falls within gambling regulation. That means operators must secure formal authorization before serving Spanish users. According to the regulator:

"The DGOJ (Spanish Directorate General for Gambling Regulation) reminds the public that in Spain, in line with other European jurisdictions, prediction markets are considered gambling when bets are placed on uncertain future outcomes. Therefore, operating them in Spain requires obtaining a specific administrative license." Source

Because Kalshi and Polymarket allegedly lacked that licensing approval, Spanish authorities ordered immediate access restrictions as what they described as "a precautionary measure." The block is expected to remain active for approximately three to four months, pending the outcome of legal review. For now, Spanish users cannot legally access either platform through normal domestic internet channels. Prediction markets may market themselves as financial forecasting tools or information markets, but if real money is tied to uncertain future outcomes, Spain treats that activity as gambling and it reflects a wider regulatory mood spreading across Europe.

Why Regulators Say User Protection Comes First

The DGOJ argued that unauthorized operators fail to meet Spain's legal standards for user safeguards. That includes identity verification systems, age restrictions, gambling self-exclusion enforcement, and technical oversight mechanisms designed to reduce abuse. The regulator stated:

"the DGOJ warns that unauthorized operators lack the technical and regulatory guarantees required in Spain, including identity verification systems, mechanisms to control access to minors and people who are self-excluded or prohibited from gambling, or the supervision standards necessary for the protection of users." Source

That concern is becoming central to how prediction markets are judged globally. The platforms often describe themselves as decentralized information systems that aggregate public sentiment. Supporters argue these markets can improve forecasting accuracy, provide economic signals, and surface real-time expectations better than polls or expert panels. Kalshi and Polymarket now rank among the largest players in the sector, with combined weekly notional trading volume reaching roughly $6.1 billion, according to DeFi Rate. That kind of scale changes how governments view these platforms. Because they are becoming significant financial systems handling billions in speculative activity. Authorities are not treating these platforms as harmless internet prediction games. They are treating them as large-scale betting businesses. Because once prediction markets are formally categorized as gambling, they become subject to entirely different legal standards.

A Global Battle Over What Prediction Markets Really Are

Spain's action comes during a broader international reckoning for prediction markets. Just days earlier, Indonesia blocked Polymarket nationwide, classifying it as illegal online gambling after politically sensitive contracts tied to President Prabowo Subianto drew local attention. Other countries including Australia, France, Poland, Singapore, Ukraine and Switzerland have also restricted access to Polymarket for similar reasons. The pressure is not limited to Europe or Asia. In the United States, prediction markets remain under intense political and legal debate. On Sunday, The New York Times reported that officials inside the Commodity Futures Trading Commission had reportedly faced pressure after raising concerns about platforms like Kalshi and Polymarket.

According to the report, the regulator under Chair Michael Selig has taken an aggressive legal position asserting that the CFTC holds exclusive federal authority over these platforms, even suing state agencies that challenge this interpretation. That federal protection has helped prediction markets grow inside parts of the US. Last week, lawmakers on the House Oversight and Government Reform Committee launched an insider trading investigation into Kalshi and Polymarket following allegations of suspiciously timed political and military-related bets. Supporters see them as transparent, efficient, and intellectually useful. For Spanish regulators, prediction markets are gambling businesses first and unless those businesses meet national licensing standards, they will remain blocked.