Polymarket Traders Profit from Suspected CDG Temperature Tampering

Two Polymarket traders profited approximately 37,000 from prediction markets on Paris weather after brief temperature spikes at Charles de Gaulle Airport unsettled the bets in their favor on April 6 and April 15.

The incidents involved markets tracking the city's daily maximum temperatures, which relied solely on data from the airport's automated weather station. On April 6, readings suddenly rose above 21 degrees Celsius before quickly reverting, resolving one market and yielding over 16,000 for a trader whose account had been created just days earlier. Nine days later, on April 15, the station held steady near 18 degrees Celsius for most of the day until it spiked to 22 degrees Celsius and dropped back within minutes, allowing another trader to claim more than 21,000. Blockchain analytics firm Bubblemaps noted that this second trader purchased shares betting against an 18-degree outcome just before the anomaly, turning a roughly 120 wager into a 180-fold return in under 30 minutes. The firm highlighted the bet's unusual size and timing compared to the trader's prior activity in weather and cryptocurrency markets.

These spikes did not appear at nearby weather stations, raising...