French authorities have opened an investigation into suspected tampering with weather station data following unusual betting activity on the cryptocurrency prediction market Polymarket.

The probe was triggered by a temperature spike recorded at a Paris airport weather station that resulted in substantial profits for at least one trader on the platform. According to reports, the mystery trader earned approximately $21,000 from bets placed on weather-related outcomes.

Polymarket, a blockchain-based platform that allows users to bet on real-world events, has seen increased activity around weather predictions. The platform uses official meteorological data to settle bets, making the integrity of weather station readings crucial for fair outcomes.

The investigation centers on whether the temperature readings were artificially manipulated to influence betting outcomes. Weather stations at airports are typically monitored by aviation authorities and meteorological services, with data used for both flight safety and public weather forecasting.

French investigators are examining the timing of the temperature anomaly and its correlation with betting patterns on Polymarket. The case highlights growing concerns about the potential for manipulation in prediction markets that rely on external data sources.

The investigation remains ongoing, with authorities working to determine whether criminal activity occurred and identify any individuals involved in the alleged tampering scheme.