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There are no SCOTUS-prediction market contracts currently on Kalshi but Polymarket lists a 41% probability that the court will accept an event contract case by 31 December.

A hearing before the Supreme Court would be the culmination of what has been the biggest sports betting-related development since PASPA. Perhaps no other issue has united gaming stakeholders from various companies, tribes, states and regulators.

Beginning with the US presidential elections in November 2024, when prediction markets catapulted into mainstream culture, their rise has been undeniable. Kalshi and Polymarket have seen their valuations balloon to $40 billion and $21 billion, respectively, and the majority of the top US bookmakers have scrambled to expand into the prediction space in various forms, either by building their own exchanges, acquiring existing ones or engaging in market-making.

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The Polymarket ad campaign debuted less than 48 hours before Wednesday’s NFL regular-season opener. The matchup is a rematch of last season’s Super Bowl as the Seattle Seahawks host the AFC Champion New England Patriots.

Last February in Santa Clara, the Seahawks held the Patriots scoreless through three quarters en route to a 29-13 win. That said, the defending champions are not the favourites to win the Lombardi Trophy this year. Nearly every US operator has installed the Los Angeles Rams as the overwhelming choice to capture the title.

As of 6pm ET, the Seahawks had a 62% probability on Polymarket to defeat the Patriots in Wednesday’s opener. Conversely, Polymarket traders gave the Patriots a 39% chance to pull the upset. At those odds, a $100 contract on the Pats carries a payout of $247.35.

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What the president didn’t address is the tax revenue from betting.

In 2025, Brazil collected almost BRL10 billion ($1.97 billion) in tax revenue from the licensed sector. In the first seven months of this year alone, BRL8.7 billion generated by the activity was delivered to public coffers. The Federal Revenue Service itself estimates that the sector should reach BRL16 billion in revenue during 2026.

Besides revenue collection, another concern is legal and economic. Companies have paid over BRL2.5 billion for licences since the sector’s regulation. Certainly, the end of the activity would lead to litigation to recover the amounts paid and compensation for investments made. Furthermore, the revenue from betting is already included in the Annual Budget Law and the Budget Guidelines Law, which define the priorities for federal government spending.