Online prediction markets Kalshi and Polymarket have implemented new policies prohibiting paid content creators and affiliates from denying election results or questioning election integrity, according to NPR reporting.

The policy changes come after several influencers posted messages on social media platform X regarding California's elections, sparking concerns about election misinformation being spread through sponsored content.

Kalshi now explicitly prohibits paid creators from "calling into question the integrity or accuracy of an election, legal ruling or official determination in connection with an election," according to the company's updated guidelines reported by NPR technology correspondent Bobby Allyn.

The controversy specifically involved right-wing influencers who posted content related to Los Angeles mayoral race results. The prediction market platforms have since asked affiliated creators to remove certain posts or risk losing their sponsorship agreements.

Both Kalshi and Polymarket operate as platforms where users can place bets on various outcomes, including political elections. The companies' decisions to restrict election-related content from paid promoters represents an effort to address concerns about the spread of election misinformation through sponsored social media posts.

The policy updates affect content creators who have financial relationships with the platforms, requiring them to comply with the new guidelines to maintain their sponsorship deals.