Spain ordered internet service providers to block access to Polymarket and Kalshi on 26 May. The Ministry of Consumer Affairs published formal sanction proceedings in the Official State Gazette the same day. The regulator gave both platforms four months to respond before a final ruling.
That makes Spain the fifth country to take action in 2026. Brazil, Indonesia, India and Portugal got there first. The pattern is consistent enough now that it counts as a trend rather than a one-off.
What Spain is actually saying
The Directorate General for Gambling Regulation, known as the DGOJ, argues that the platforms operate without the gambling licence required under Spanish law. The specific objection is not the prediction market structure in the abstract. It is the missing safeguards for minors and self-excluded players.
Read that carefully. Spain is not arguing prediction markets are illegitimate. It is arguing that any platform allowing real-money positions on uncertain outcomes is functionally a gambling operator and needs to meet the same player-protection floor as Bet365 or Bwin. The four-month investigation will likely end with the same conclusion the Portuguese regulator reached: get a licence or stay out.
The Polymarket and Kalshi defence has been that they offer event contracts, not bets. In a US regulatory context that distinction has held up because the Commodity Futures Trading Commission regulates derivatives differently from gambling. In Europe the distinction does not exist in any meaningful way. The Spanish gambling law is broad and outcome-focused. If money changes hands based on a future event, the law treats it as gambling.
Why this matters for everyone, not just crypto users
If you run a sportsbook or a casino-affiliate property in Europe, this is good news disguised as a tech story. Prediction markets have been bleeding active users away from licensed sportsbooks for the better part of two years. Polymarket alone hit $1 billion in monthly volume during the 2024 US election cycle and the sports event categories have grown steadily since.
The unlicensed nature of those platforms gave them three real advantages. No tax. No KYC friction. No deposit limits. None of that is sustainable once national regulators treat them as gambling operators, which is exactly what is now happening.
Spanish licensed sportsbooks are about to get some of their lost share back. Same probably true in Portugal, where the regulator moved earlier this year. The pattern will repeat across the EU.
What I would watch next
Three things.
First, the UK Gambling Commission has been notably quiet on prediction markets so far. That is partly because the question of whether Polymarket-style event contracts count as fixed-odds betting under the 2005 Gambling Act has not been formally tested. The UKGC will move eventually. The question is whether it waits for the EU response to settle or jumps ahead.
Second, Kalshi has been pushing hard to legitimise sports event contracts in the US through the CFTC route. If they succeed there, expect them to use US legitimacy as a wedge to argue for licensed access in Europe. That is a five-year strategy at minimum.
Third, the operator response. DraftKings and Flutter both filed amicus briefs in US prediction market cases earlier in 2026 arguing that event contracts are gambling. They were right then and they are right now. Watch for European operators to start filing similar interventions with the European Gaming and Betting Association.
My read
The “we are not gambling, we are a financial product” defence worked in 2024 because regulators were caught flat-footed. It is not working in 2026 because regulators have had time to look at the actual user behaviour, which is functionally identical to sports betting and casino gaming.
Spain blocking access does not kill Polymarket or Kalshi. Both platforms are well-funded and the US business is fine. What it does is close off the soft European expansion route. If those companies want European users, they will need a Spanish licence, an MGA licence, a UKGC licence and so on. That is the same regulatory burden Bet365 carries. The cost advantage that made prediction markets interesting evaporates the moment they have to play by the same rules.
I have said this to a few operators recently. The competitive threat from prediction markets was always conditional on them remaining in regulatory grey zones. The grey zone is shrinking and the threat is going with it.
Spain is not the last domino. It is somewhere in the middle of the row.