Brazil Bans Prediction Markets, Labels Them Unregulated Gambling

Brazil's Central Bank and CMN ban binary event contracts, targeting platforms like Polymarket to curb household debt and speculative gambling risks.

The decision, finalized on April 24, reflects government efforts to tighten control over online betting and limit risks to households.

From “Financial Instrument” to Gambling

The core argument from regulators is that so-called “binary event contracts”—bets on events such as elections or weather—do not constitute legitimate financial derivatives. Under the new framework, they fall outside the sports betting law passed in 2025 and must be treated as unregulated gambling.

With the new resolution from the National Monetary Council (CMN), published by the Central Bank of Brazil, a clear distinction is introduced: only derivatives linked to economic indicators such as inflation, interest rates, or commodities are permitted. Conversely, all contracts based on social, political, or cultural events are prohibited.

Blocking and Increased Control

The telecommunications regulator Anatel has already begun blocking access to affected sites, a measure covering both local and international platforms. Finance Secretary Dario Durigan described the previous period as “regulatory anarchy,” which the government aims to replace with a strictly defined framework.

Authorities emphasize that the goal is consumer protection, especially amid growing concerns that such platforms encourage speculative behavior and could increase household debt.

Part of a Global Trend

Brazil’s move fits into a broader international trend of restricting prediction markets. Polymarket has already been blocked in several jurisdictions, including Romania, France, and the United Kingdom. This demonstrates a growing regulatory consensus that these services belong in the realm of gambling rather than financial markets.

Market Consequences

The ban is likely to restrict Brazilian investors’ access to these platforms and may lead to a shift in activity toward unregulated or offshore channels. For the industry, this is another signal that the regulatory environment is becoming increasingly fragmented, with different countries adopting radically different approaches to digital finance innovation.

Broadly speaking, Brazil’s decision highlights the rising tension between regulators and new forms of trading that blur the lines between investment and betting—a debate that is only expected to intensify.