The U.S. Court of Appeals for the 6th Circuit ruled on September 25, 2026 that Kalshi, a prediction market platform registered with the Commodity Futures Trading Commission (CFTC) as a Designated Contract Market (DCM), had not proven that its sports event contracts qualify as "swaps" under the Commodity Exchange Act (CEA). Because that classification drives the legal argument for federal preemption, the court found nothing blocking Ohio and Tennessee from enforcing their own gambling statutes against the platform.

The ruling lands hard on Kalshi's bottom line. Sports contracts account for an estimated 85 to 90 percent of the company's roughly $4 billion in annual revenue. The company had argued that Congress deliberately stripped a state-regulation carveout from the CEA when amending it in 1974, leaving the CFTC as the sole authority over commodity swaps traded on registered exchanges. The 6th Circuit was not persuaded. Judges questioned the company's reliance on policy-based arguments, with one judge during oral arguments observing that Kalshi was making a policy argument, predicting bad outcomes under state control, rather than a legal one.

How Kalshi arrived at this position traces back to May 2025, when the CFTC abandoned its own appeal against Kalshi's election markets. Emboldened, the company expanded aggressively into sports contracts, launching NFL and Super Bowl markets in early 2025. That expansion into contested territory triggered the wave of state enforcement actions the company now faces. Massachusetts was among those that issued cease-and-desist orders against Kalshi even before this week's ruling.

A Three-Circuit Split With No Clear Winner

The ruling creates a genuinely tangled legal landscape. In April 2026, the 3rd Circuit ruled in Kalshi's favor, finding its sports contracts are swaps and that CEA preemption blocks New Jersey from regulating them. Judge Roth dissented, arguing for state authority, writing that the products are "virtually indistinguishable from betting products available on online sportsbooks."

Then in August 2026, the 9th Circuit sided with Nevada's gaming regulators, dissolving Kalshi's preliminary injunction and upholding state authority. The 6th Circuit's ruling this week adds Ohio and Tennessee to the column of states with enforceable claims. With three circuits now pulling in conflicting directions, U.S. Supreme Court review is widely considered highly probable.

New York added further pressure in July 2026, filing a $36 million civil enforcement action against Kalshi before this latest ruling even arrived.

The CFTC has not been idle. In June 2026, it published a proposed rulemaking in the Federal Register introducing a substantive public interest test under Rule 40.11, a framework designed to determine which event contracts are acceptable for trading on federally registered markets. Analysts note the agency appears to be trying to establish clearer federal ground rules at the same time as courts are chipping away at the federal preemption argument Kalshi relies on.

What Decentralised Platforms Look Like in This Environment

Kalshi's legal exposure contrasts sharply with the situation facing Polymarket, its decentralised rival. Polymarket operates on the Polygon proof-of-stake blockchain and settles trades in pUSD, a 1:1 USDC-backed token the platform migrated to on 28 April 2026, moving from USDC.e. Because it has no single regulatory registration to revoke, the 6th Circuit's ruling cannot shut it down the way state enforcement can pressure Kalshi.

The on-chain data reflects its scale: Polymarket recorded over 734,000 monthly active traders in March 2026, holds roughly $514 million in total value locked as of June 2026, and its CTF Exchange V2 (Conditional Token Framework Exchange V2) was the single busiest smart contract on Polygon in July 2026, accounting for 25.3 percent of all transactions on the network and 39.5 percent of gas burned.

Combined monthly volume across Kalshi and Polymarket reached approximately $45 billion in June 2026. Polymarket secured a path to U.S. intermediated trading after acquiring CFTC-licensed exchange QCEX for $112 million in July 2025 and receiving regulatory approval that November. By March 2026, Polymarket had self-certified new market rules with the CFTC, a further step in its regulatory pathway. Intercontinental Exchange (ICE) and NYSE have committed up to $2 billion in investment in Polymarket, institutional backing that underscores the platform's growing scale.

Decentralisation is not a complete shield, however. Fiat on-ramp providers, regional intermediaries, and locally operated front-ends all face legal exposure in jurisdictions that classify these contracts as gambling. The more Polymarket grows, the more pressure points appear for regulators to target.

The Global South is Watching

The 6th Circuit's core logic, that event contracts look more like gambling products than financial instruments, is already the working assumption of regulators across Africa and South Asia. In Nigeria, the Lagos State Lotteries and Gaming Authority has moved against Bayse Markets, formerly known as Gowagr, on exactly those grounds.

The South African Bookmakers Association (SABA) has pushed for new rules to halt unregulated prediction market activity. Kenya's new Gambling Regulatory Authority, created under the Gambling Control Act that took effect in August 2025, is still writing its rules and could extend gambling-style oversight to on-chain platforms. In India, where prediction markets occupy a grey zone under colonial-era gambling laws, a future U.S. Supreme Court ruling upholding federal preemption could give domestic fintech advocates ammunition to argue for an exchange-regulated model under SEBI. A ruling that affirms state gambling authority would cut in the opposite direction.

For builders deploying prediction market infrastructure on Polygon for users in Lagos, Nairobi, or Mumbai, the 6th Circuit's framing provides legal cover for enforcement actions that require no new legislation. It also underlines why the on-chain, permissionless architecture that Polymarket uses has emerged as the most resilient model for reaching users in markets where centralised licensing is either unavailable or actively hostile.

Kalshi did not respond to a request for comment.