EU Regulator Questions Legal Footing of Polymarket and Kalshi

Europe’s top securities watchdog has put prediction markets on notice. The European Securities and Markets Authority (ESMA) said on September 10 that it has concerns about the legal basis under which Polymarket and Kalshi are offering services to users inside the European Union, warning of possible gaps in authorization under the bloc’s financial rules. The statement does not announce a ban or a fine, but it signals that Brussels is scrutinizing whether two of the fastest-growing platforms in the prediction-market boom are actually allowed to operate where they do.

What ESMA is actually saying

Prediction markets let users trade contracts tied to the outcome of real-world events, from elections to economic data releases to sports results. Polymarket and Kalshi have turned that simple idea into large, liquid marketplaces, and their rapid growth has drawn the attention of regulators well beyond Europe. The core legal question, and the one ESMA is now raising for the EU specifically, is whether these event contracts should be treated as financial derivatives, which would require licensing under EU securities law, or as something closer to gambling products, which fall under an entirely different regulatory regime with its own national rules across the bloc’s 27 member states.

That distinction matters enormously in practice. If EU regulators conclude that prediction-market contracts are derivatives, platforms would need to secure authorization comparable to what traditional exchanges and brokers must obtain before soliciting EU customers. If they are instead classified as gambling products, the platforms would face a patchwork of national gambling licenses instead of a single EU-wide financial framework. ESMA’s warning suggests the agency believes Polymarket and Kalshi may currently fall into neither category cleanly, leaving a gap where EU users can access the platforms without the platforms holding the specific approvals regulators think are required.

Why this matters beyond the two platforms

This is not the first time a fast-moving crypto-adjacent product has run ahead of the rulebook meant to govern it. Regulators in multiple jurisdictions have already been examining whether prediction markets are, in substance, derivatives trading, sports betting, or something new that existing statutes never anticipated. ESMA’s intervention adds Europe to that list and raises the stakes because the EU’s Markets in Crypto-Assets framework and its broader securities rules have increasingly become a reference point for how other regions structure their own oversight.

For everyday users in the EU, a formal warning from ESMA does not immediately change access to Polymarket or Kalshi. But it does raise the odds that the platforms will need to make a choice: seek formal authorization under EU rules, restrict services to EU residents, or risk enforcement action down the line. Any of those outcomes would reshape how Europeans can participate in event-contract trading, and it puts pressure on the platforms to clarify their legal structuring in a market that has otherwise embraced crypto-native products with notable speed, as seen in recent moves by Brazilian banks expanding crypto offerings or Nubank’s rollout of a stablecoin-powered global account.

The episode also fits a broader pattern of regulators trying to catch up with products that blend financial speculation, information markets, and consumer-facing apps. In the United States, lawmakers have been working through similar boundary questions in crypto markets more broadly, including the Senate’s ongoing effort around the revised Clarity Act targeting decentralized finance, which underscores how legislators on both sides of the Atlantic are wrestling with where new financial products fit inside old legal categories.

What to watch next

Several concrete developments will show whether ESMA’s warning becomes a turning point or a footnote.

• Whether Polymarket or Kalshi publicly respond to ESMA’s concerns, and whether either firm applies for authorization under EU financial rules or a national gambling license.
• Whether ESMA or national regulators in individual EU member states follow up with formal investigations, restrictions, or requests that the platforms limit access to EU IP addresses.
• Whether the European Commission or European Parliament weighs in with guidance on how event contracts should be classified going forward, given the ambiguity ESMA has flagged.
• Whether other jurisdictions cite ESMA’s warning as a reference point in their own reviews of prediction-market platforms, given that regulatory scrutiny of Polymarket and Kalshi has already surfaced elsewhere.

None of this guarantees a specific outcome for EU users of these platforms. But it does mean the regulatory ambiguity that has allowed prediction markets to scale quickly is now under direct examination by one of Europe’s most influential financial authorities, and the resolution will likely shape how similar products are allowed to operate across the bloc.

Source: CoinDesk

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