NFL’s Supreme Court Filing Tests Prediction Market Rules
Polymarket put the chance that the Supreme Court will take up the legal status of sports event contracts by year-end at 29% on October 9, after the National Football League and other groups filed briefs in the Court’s pending Kalshi case. The filings do not decide whether the justices will hear the dispute, but they turn a platform-design question into a public argument about who sets the rules for sports markets.
Key Takeaways Polymarket’s year-end certiorari contract showed 29% for Yes on October 9, with a 27% bid and 31% ask. The Supreme Court docket listed the NFL’s brief on October 8 and set Kalshi’s response deadline for November 9. The NFL cited a first-Sunday 2026 NFL season snapshot…
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