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Polymarket bases its weather-related bets on official sensor readings, and the specific device in question was located on a publicly accessible road. Investigators suspect that someone used a battery-powered hairdryer to artificially raise the temperature reading, effectively rigging the outcome. On both occasions, the platform had assigned less than a one percent probability to the temperature reaching those levels, making the successful bets highly lucrative.
France’s national weather agency, MΓ©tΓ©o-France, confirmed it has filed a complaint after detecting physical anomalies on the sensor and irregularities in the data. The case is now being handled by the Air Transport Gendarmerie. While Polymarket has not required any winnings to be returned, the affected sensor has since been relocated to prevent further tampering.
The incident highlights a broader vulnerability in prediction markets that rely on real-world data inputs. When physical systems can be accessed and manipulated, outcomes tied to financial incentives become susceptible to fraud. This raises concerns about the types of events offered for betting, especially as platforms like Polymarket and Kalshi host markets on sensitive geopolitical and legal issues.
Ultimately, the episode underscores the risks of linking financial speculation to real-world, alterable conditions—where even simple tools can potentially distort outcomes for profit.
