Circuit Split Opens Supreme Court Path for Sports Prediction Markets

What Just Happened

Two developments landed within days of each other that, taken together, make a Supreme Court showdown look increasingly likely. The Ninth Circuit unanimously ruled that Kalshi's sports markets aren't exempt from state sports betting laws — with the panel's opinion pointedly noting that Kalshi had advertised itself as "the first app for legal sports betting in all 50 states." Almost simultaneously, New Jersey formally petitioned SCOTUS to overturn the Third Circuit, which had ruled in Kalshi's favor back in May. That's a textbook circuit split, and it's the kind of conflict the Supreme Court tends to find hard to ignore.

The Legal Tightrope Kalshi Is Walking

Kalshi's immediate response to the Ninth Circuit loss was to drop the word "bet" from its product language — a tell that the company knows its regulatory framing matters as much as its legal arguments. But according to law professor Melinda Roth, the Ninth Circuit ruling isn't a clean wipeout. There's reportedly enough nuance in the judgment for Kalshi to shape arguments at a higher court. What's less ambiguous is the competitive pressure: DraftKings and FanDuel are actively targeting Kalshi's user base, with their own apps competing directly for sports bettors who might have drifted toward prediction markets.

The SCOTUS Numbers Game

New Jersey needs four justices to agree to hear the case. Notably, five of the justices who sat on the 2018 PASPA bench are still serving — the case that previously handed New Jersey its biggest gambling law victory. Whether that history makes them more or less inclined to weigh in again is genuinely unclear, but the circuit split gives the petitioners their strongest procedural argument for certiorari.

Why Operators and B2B Providers Should Care

This isn't just a Kalshi problem. The outcome will define whether a federally regulated prediction market can operate across all 50 states without state-by-state licensing — which has direct implications for any B2B platform provider thinking about adding prediction market modules or integrating with CFTC-regulated venues. A few things to track:

• If SCOTUS sides with the states: prediction markets face the same fragmented, state-by-state compliance burden as traditional sportsbooks
• If SCOTUS sides with Kalshi: a new, federally preempted product category opens up that bypasses existing state licensing frameworks
• If SCOTUS declines to hear it: the circuit split persists, creating a patchwork where the product is legal in some jurisdictions and illegal in others depending on which circuit applies

For platform providers currently building or evaluating sports betting integrations in the US market, the compliance architecture they choose right now may need to flex considerably depending on which way this goes.