By Jeff John Roberts By Jeff John Roberts Editor, Finance and Crypto Jeff John Roberts Editor, Finance and Crypto

Jeff John Roberts is the Finance and Crypto editor at Fortune , overseeing coverage of the blockchain and how technology is changing finance. SEE FULL BIO

Over Labor Day weekend, social media lit up with observations that President Trump had not been seen in public for several days. Soon, rumors swirled about Trump’s health —and ghoulish hashtags even claimed he had died. Yes, it was just another weekend in the online rumor mill, but this round of speculation came with a novel twist: a flurry of bets about the president’s health on so-called prediction market sites. On Kalshi, the odds of Vice President JD Vance taking office by the end of the year

See Full Page