Kalshi

Kalshi Inc. is a web-based prediction market platform based in Manhattan, New York City. Launched in July 2021, the platform is used primarily for traditional sports betting, which constitutes more than 90% of the activity on the site and 89% of the site's revenue in 2025. Activity on the site is described as "heavily tied to the sports calendar" by analysts.

To a smaller extent, the platform is also used to place bets on future events, including economic indicators, cultural events, and most controversially, political outcomes for which the platform received much media attention.

The site has been involved in several controversies and lawsuits regarding the legality of its political betting markets, the ethics of allowing wagers on sensitive geopolitical issues, and insider trading. Concerns over election integrity and decreasing public trust in the democratic process caused by election betting were raised by consumer advocacy groups and politicians.

Scholars have challenged the assertion that Kalshi efficiently and accurately aggregates information about outcomes.