A Frenchman with a hairdryer made $34,000 by heating up a thermometer at a Paris airport — security is now looking for the “genius” who cashed in on a temperature bet on Polymarket

The trick was that Polymarket’s weather market relied on data from a specific thermometer located near an airport, with no security around it. On April 15, the day’s high was showing 18°C, but someone went all-in betting on 22°C.

The anonymous bettor then allegedly approached the thermometer, heated it with a portable hairdryer to the target temperature, and ran off to lock in the profit.

After the incident, the market reportedly switched to a different airport’s thermometer — this time with security guards placed next to it.