Brazil has recently intensified its regulatory scrutiny of prediction market platforms like Kalshi and Polymarket, which officials argue function similarly to illegal betting operations.
Telecom regulator Anatel took decisive action by shutting down 27 prediction market websites after a thorough review indicated they violated betting regulations established by Congress. As a result, users in Brazil could no longer access the sites of Kalshi and Polymarket as of Friday afternoon.
This regulatory action follows the enforcement of a new rule by the National Monetary Council that strictly confines derivative trading to economic and financial indicators like price indices, interest rates, and exchange rates. Any contracts connected to sports, online gaming, politics, elections, cultural events, or social outcomes have been excluded from the legal purview of derivatives.
The Finance Ministry articulated that prediction markets typically use binary event contracts, allowing participants to wager on potential outcomes with yes or no positions. Kalshi and Polymarket are particularly prominent examples within this global landscape, highlighting how their structures can mimic fixed-odds betting principles.
Brazil's leadership recognizes that while these markets may be marketed as financial products, the operational reality bears a closer resemblance to betting formats. The government, emphasizing the need to regulate such platforms, aims to avert an unmonitored betting market from taking hold within its borders.
This move also reinforces Brazil's stance amidst global regulatory debates surrounding prediction markets. While the country introduced a regulated online betting market in January 2025, existing laws currently restrict legal betting to fixed odds associated with verified sports events and online games, thereby sidelining markets focused on political or cultural phenomena from legality.
As Brazil enhances its regulatory framework, this expands the conversation on how countries worldwide grapple with the classification and oversight of prediction markets. Investors should monitor these developments closely, as they may indicate broader trends affecting market access and compliance in the future.