The claim is supported by two secondary reports, Odaily newsflash 475160 and Polymarket secures La Liga authorization, becoming its exclusive prediction market partner | Bitget News, which both present the same core facts: an exclusive prediction market partnership between Polymarket and La Liga, exclusive availability of official match prediction markets for clubs including Real Madrid and Barcelona on Polymarket, and the characterization of La Liga as the first major European football league to do this. The Odaily item traces directly to https://x.com/Polymarket/status/2039781024356323470, suggesting an official Polymarket announcement as the primary source. However, because the X post could not be fetched directly and no La Liga official page was found in this run, the evidence is not fully primary-source validated. There is no conflicting evidence among the gathered sources, so the statement is more likely true than false, but confidence remains medium rather than high.