NBA Opens Its Doors to Kalshi and Polymarket With Strict Rules

The NBA just handed Kalshi and Polymarket a coveted seat at the table, naming both platforms preferred prediction-market exchanges on Oct. 26, 2026, while securing something traditional betting partnerships rarely offer: direct oversight of which contracts can be traded. The agreements, reported by ESPN and The Athletic , give the NBA approval rights over categories of contracts the exchanges can offer. That’s a notable departure from conventional sportsbook arrangements, where leagues generally exercise less direct influence over available wagers. In its Oct.