NFL's numbers: $1.8B of $3.3B on NFL Sunday, and no 21+ floor

The NFL is asking the Supreme Court to treat sports prediction markets as gambling businesses subject to state oversight, according to the New York Post. Its filing supports New Jersey’s challenge to Kalshi and places the league on the side of states seeking tighter controls over a rapidly expanding market.

The league says football-linked trading reached $1.8 billion on the season’s first Sunday, out of $3.3 billion in total prediction-market volume. Those figures frame the dispute as a question with substantial consequences for sports trading, rather than a narrow disagreement over regulatory jurisdiction.

Who should regulate sports contracts?

According to the New York Post, New Jersey is seeking to overturn an appellate ruling that effectively gave federal regulators precedence over states. Its challenge has support from bipartisan attorneys general from 39 states, dozens of Native tribes and the casino industry. Federal appeals courts have reached conflicting conclusions about which level of government has authority. New York Attorney General Letitia James has separately sued Kalshi and Polymarket, alleging illegal gambling operations.

The platforms operate under Commodity Futures Trading Commission oversight. The supplied summary puts the agency’s nationwide workforce at 543. The NFL wants sports participants to face a minimum age of 21; the Post reports that the current framework permits users as young as 18. State gambling taxes are another point of contention. The league says it does not oppose prediction markets themselves, but considers state supervision better suited to their sports-related risks.

Integrity concerns meet platform pushback

The NFL’s filing raises the possibility of athletes manipulating individual outcomes, including a kicker deliberately missing a field goal or a wide receiver intentionally fumbling a pass, according to the Post. It also flags injury and officiating markets as susceptible to insider trading. Both platforms have announced policies against insider trading, but enforcement incidents remain part of the debate: Kalshi imposed its first lifetime ban on former Rep. George Santos in August over allegations that he earned more than $17,000 betting on his own State of the Union attendance. This spring, federal prosecutors charged an Army officer over $400,000 earned on Polymarket using classified information about the operation to capture Nicolás Maduro.

Kalshi told the Post that its attempts to engage with the NFL had gone unanswered and argued that CFTC enforcement and ongoing rulemaking address the league’s concerns. Its spokesperson cited partnerships including MLB and NHL. Polymarket pointed to surveillance tools and collaboration with the CFTC, SEC and professional leagues, arguing that a unified federal framework would provide more consistent safeguards than separate state systems.

The sports industry is not aligned. The Post reports that MLB, Major League Soccer and UFC have Polymarket deals, while NHL partners with both platforms. NBA, PGA and NFL have joined neither; the NFL also prohibits advertising partnerships with them. Commissioner Roger Goodell emphasized patience and game integrity in remarks to CNBC Sport in September. Kalshi and Polymarket launched in the US in July 2021 and December 2025, respectively.

What it means for prediction markets

• Jurisdiction is the central uncertainty. The dispute concerns whether federal oversight displaces state gambling rules—not a settled determination that those rules already apply.
• Access and costs are at issue. A state-regulated approach could bring a 21-year age threshold and gambling taxes to sports contracts.
• Sports volume makes the stakes substantial. The NFL’s $1.8 billion figure accounts for more than half of the reported $3.3 billion first-Sunday total.
• Integrity safeguards remain contested. The NFL questions the adequacy of existing supervision, while platforms defend federal enforcement, surveillance and league partnerships.