Spain has become the fifth country to block prediction market platforms in 2026, joining Brazil, Indonesia, India, and Portugal in enforcing gambling regulations. Spain's gambling regulator, the Directorate General for Gambling Regulation, ordered internet service providers to block access to Polymarket and Kalshi after the Ministry of Consumer Affairs published formal sanction proceedings in Spain's Official State Gazette on May 26. The block is expected to take effect within seven to ten days and will remain in place for approximately three to four months while the investigation concludes. Spain classified both platforms as illegal gambling operators for offering money-staked bets on uncertain future outcomes without the required administrative authorisation. Authorities cited a total absence of age verification controls, self-exclusion mechanisms, and identity checks safeguards that Spanish gambling law requires from all online operators taking money-staked wagers.
Polymarket is implementing stricter Know Your Customer (KYC) requirements while strictly blocking VPN access to combat regulatory pressure and sanctions compliance challenges. The platform is now pushing traders toward voluntary identity checks while clamping down on suspicious accounts, with users who complete KYC/KYB forms gaining access to direct co-location on Polymarket's primary servers for lower latency trading. According to The Information, traders running seven-figure positions or rapid five-figure deposit-trade-withdraw cycles have been documented triggering verification under internal anti-money laundering thresholds. The international platform remains separate from Polymarket US, which requires full KYC since the company acquired a CFTC-licensed exchange in 2025. As per Bitcoin News, the gap between these two tiers is what regulators and lawmakers are now focused on, with the platform currently blocking users from roughly 33 to 35 jurisdictions including the U.S., Russia, France, the U.K., Germany, Iran, and the Netherlands.
House Oversight Committee investigators have requested KYC and geographic enforcement records by June 5, intensifying regulatory scrutiny on the prediction market platform. A U.S. House oversight letter submitted this month asked Polymarket to detail its KYC enforcement, geoblocking controls, and systems for detecting suspicious trading activity. Spain's enforcement action was particularly significant as it coincided with Polymarket recently opening a market on whether Prime Minister Pedro Sánchez's government would fall early, with Kalshi listing Sánchez at 29% odds to leave office in 2026. Both markets generated significant traffic on Spanish social media, accelerating regulatory attention that might otherwise have moved more slowly. Spanish authorities were explicit that blockchain infrastructure does not exempt platforms from gambling law, stating "Using crypto or blockchain doesn't change platforms that let users wager on uncertain outcomes from being gambling products." The same legal framing has now been adopted by at least five separate national jurisdictions.
The Spanish block represents the latest in a series of enforcement actions targeting prediction market platforms. Brazil blocked both platforms in April as part of a sweeping action covering approximately 28 platforms. Indonesia blocked Polymarket on May 25 as illegal online gambling, while India issued a formal blocking order on May 21 after reclassifying prediction markets as "money games" under rules that took effect May 1. Portugal blocked Polymarket in January after a surge in presidential election bets, and Argentina followed with a court-ordered block in March. The Netherlands escalated enforcement in February and Belgium made a referral in March, making Spain the third European-level action of 2026. Both Polymarket and Kalshi are currently valued at approximately $15 billion and $22 billion respectively, with both platforms together having processed several billion dollars in trading volume around the 2024 US presidential election and continuing to expand into sports, geopolitics, and corporate-event contracts.
Polymarket published enhanced market integrity rules in March 2026, covering both platforms and including surveillance partnerships, anomaly detection systems, and blockchain forensics through Chainalysis. Violations can result in account suspension, permanent bans, financial penalties, or referrals to law enforcement. The platform operates on a dual structure with its offshore international platform historically offering wallet-based access, which drove billions in trading volume during the 2024 U.S. elections, while its domestic arm Polymarket US is operated by QCX LLC under CFTC oversight as a Designated Contract Market and already requires full identity verification for American users. For traders who prefer pseudonymous access, the shift adds friction, though the platform has cooperated with authorities in select cases and publicly emphasized its monitoring capabilities. The real question remains which regulators are actually in control, with state regulators clashing with federal authorities in the U.S., particularly the CFTC, as President Trump recently posted on Truth Social arguing that prediction markets fall under the CFTC's jurisdiction.
