The NBA named Kalshi and Polymarket its preferred prediction market exchanges on Oct. 26, 2026.

Kalshi said the deal brings official NBA data to settle trades, stronger safeguards, and NBA branding on Kalshi (post), with details on integrity, consumer protection and athlete safety (announcement). Polymarket confirmed the same preferred status with official NBA data and exclusive activations (post).

The Defiant summarized it as official data for settling basketball markets plus direct integrity cooperation, with Polymarket receiving the same designation (article). ESPN reporting cited on X adds league approval over which markets run, a trading ban for league and team staff, and an NBA memorandum of understanding with the CFTC on cooperation around NBA prediction markets (ESPN link).