Federal regulators have opened an inquiry into "mention markets," a type of prediction market where users bet on the specific words or names a public figure might say. According to two sources familiar with the matter who spoke to NPR, the probe is examining whether these markets are susceptible to manipulation by insiders or bad actors.
The Commodity Futures Trading Commission (CFTC), the agency that oversees derivative markets, is conducting the review. In response to the inquiry, Kalshi, the largest prediction market in the U.S., has suspended all mention markets related to sports events "until further notice." The company continues to offer mention markets for earnings calls, political events, and news broadcasts.
The investigation follows a July disclosure that a teleprompter operator for President Trump used Kalshi to bet on the words the president would use during public speeches. Kalshi stated its internal tools flagged the trades and reported them to federal authorities. CFTC rules for "swaps," a form of financial derivative, require market operators to certify that their platforms are not "readily susceptible to manipulation."
Recent market outcomes have also raised questions about the reliability of these wagers. During the World Cup final, a Kalshi market regarding celebrity attendance was settled based on an announcer's verbal error. Although Matt Damon was at the game, a sportscaster mistook him for Brad Pitt. Because Kalshi’s rules rely on "source agencies" like news organizations to resolve bets, the market settled in favor of Pitt's attendance. Data from Kalshi showed that participants who bet against Pitt's presence lost a combined $287,866.
The scale of the financial impact is evidenced by individual market events, such as the $287,866 loss recorded by traders in a single celebrity-mention market. For the broader industry, the probe tests the legal definition of "manipulation" in the context of human speech. If the CFTC determines that these markets are too easily rigged, it could set a precedent that limits the types of "self-certified" contracts exchanges can offer, potentially restricting the expansion of the prediction market sector into entertainment and media.
What happens next depends on the findings of the CFTC's review. While Kalshi and the CFTC have declined to comment publicly, the agency is evaluating whether these wagers meet federal standards for financial integrity. No specific deadline for the conclusion of the probe has been reported. Meanwhile, Kalshi remains involved in more than two dozen lawsuits from states and tribes regarding its primary sports betting operations.