ESMA Reminds Firms of Binary Option Rules as Prediction Markets Grow

Key Facts

• ESMA has reminded firms of existing binary-option product intervention rules as prediction markets expand globally.
• Prediction market platforms including Polymarket and Kalshi have geo-blocked parts of the EU rather than seek full authorization.
• The reminder does not introduce new rules; it applies a measure that has existed in EU law since 2018.

The European Securities and Markets Authority has issued a reminder that firms offering products resembling binary options must comply with the EU’s existing binary option product intervention measures, a rule that has existed in some form since 2018 and long predates the current wave of prediction market platforms. ESMA’s own framing situates this as a reminder of existing obligations rather than a new rule, but the timing, arriving as platforms like Polymarket and Kalshi expand their user bases well beyond the U.S., makes clear which products regulators actually have in mind.

Why a Prediction Market Can Look Like a Binary Option

A binary option pays a fixed amount if a specific condition is met by a set time and nothing if it is not, structurally almost identical to a prediction market contract that pays out based on whether an event occurs. The EU restricted binary options to retail investors specifically because their all-or-nothing payout structure and short time horizons made them a common vector for retail losses, closer in practice to gambling than to investing, according to the regulatory reasoning behind the original measure. A modern prediction market contract on, say, whether a specific economic data point comes in above a threshold, shares that same payout shape even when it is marketed using different language, around forecasting or informed betting on real-world events rather than financial speculation.

This is exactly the ambiguity ESMA’s reminder is aimed at closing. Whether a specific prediction market contract counts as a restricted binary option under EU law likely depends on details, the underlying event, how the contract is marketed, whether it is offered to retail users, that vary contract by contract rather than platform by platform, which is part of why platforms have found it simpler to geo-block EU users on parts of their product entirely rather than litigate the classification question market by market.

What This Means for Platforms Operating in the EU

ESMA’s broader news and guidance channel shows a regulator that has been increasingly active in flagging how existing derivatives rules apply to newer product categories, including a parallel reminder issued about perpetual futures and existing CFD intervention measures. The pattern across both reminders is consistent: ESMA is not waiting for a bespoke prediction-market or perpetual-futures regulation to be written before acting. It is applying rules already on the books, which means platforms operating or planning to operate in the EU face regulatory exposure now, under existing law, rather than at some future point once new legislation catches up with the product category.

This post first appeared in ESMA Reminds Firms of Binary Option Rules as Prediction Markets Grow