Trump Vows to Make US Prediction Market Capital as Spain Blocks Sites

Viewed from Washington, the White House is placing a high-stakes bet on the future of digital finance. President Donald Trump this week insisted that the United States must remain the “Crypto Capital of the World” and, in the same breath, guaranteed that prediction markets would “thrive” under his administration. In a post on his Truth Social platform, Trump declared the Commodity Futures Trading Commission’s exclusive authority over such markets to be “critically important” and framed a set of rules as the “Gold Standard for the States”. The intervention, as unapologetic as it was unambiguous, throws down a gauntlet to regulators elsewhere who are moving in the opposite direction.

Across the Atlantic, Spain has become the latest European country to push back. The government in Madrid this week ordered internet service providers to block access to Polymarket and Kalshi, the two dominant prediction market platforms, as a precautionary measure pending a formal investigation. Officials are examining whether the sites are effectively operating as gambling services without a licence, a probe expected to conclude within four months. Viewed from London, the Spanish move underscores a persistent European unease: a belief that markets enabling wagers on war, elections and geopolitical shocks must comply with consumer-protection laws designed for casinos, not chaotic digital bourses.

The Australian authorities share that caution. Both platforms are currently blocked there, though a political push to legalise and license prediction markets is gathering momentum. The sheer scale of the industry makes the debate urgent. Kalshi and Polymarket are each estimated to be worth more than $20 billion, with billions traded weekly on questions ranging from the frivolous—whether a former president will use a particular insult—to the deadly serious, including whether Russia will capture an eastern Ukrainian city or Israel will strike Yemen. Campaigners for liberalisation point to the value of aggregated probability data, but opponents argue that certain markets amount to trading in human suffering.

Yet beneath the geopolitical regulatory scramble lies a structural fault line that raises questions about the fairness of these markets themselves. A new investigation reveals that nine anonymous cryptocurrency wallets have come to control the resolution of disputed bets on Polymarket, giving a tiny cabal outsized power over billions of dollars in wagers. In the past year, around 2,000 contracts—many linked to wars, elections, and international crises—were settled through this opaque external mechanism. In April alone, 230 contested contracts were resolved by the same cluster of wallets. For platforms that sell themselves on transparency and the wisdom of crowds, such concentration of adjudicatory power is a stark contradiction.

Analysts in Washington, London, and Sydney now face the same question: can a market predicated on democratic, decentralised forecasting survive if its integrity is entrusted to a handful of anonymous actors? The White House is betting that clear, CFTC-led oversight will provide the answer, giving the United States a first-mover advantage in a race that other nations, from Spain to Australia, are approaching with far greater scepticism. The coming months will test whether robust regulation and market integrity can evolve in tandem, or whether the global scramble for prediction markets will fracture along increasingly incompatible lines.