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French Weather Agency Alerts Police to Sensor ‘Interference’ After $35K Polymarket Payouts
TL;DR
Polymarket traders earned over $35,000 after temperature anomalies at a Météo France sensor favored their bets, prompting the agency to file a police complaint for interference. One trader reportedly made a $120 bet that yielded a $21,000 payout shortly before the temperature spike.
Key points
- Polymarket traders earned over $35,000 from temperature spikes.
- Météo France filed a police complaint for sensor interference.
- One trader made a $21,000 profit from a $120 bet.
- The incidents expose vulnerabilities in prediction markets.
- Polymarket is under scrutiny for market integrity issues.
Mentioned in this story
Météo FrancePolymarketMark Roulston
Bubblemaps
In brief
- Polymarket traders pocketed more than $35,000 after temperature spikes at a Météo France sensor resolved long-shot Paris weather bets in their favor.
- Bubblemaps flagged a $120 bet that returned $21,000, a 180x gain, placed at under 1% odds minutes before one anomaly.
- Météo France has filed a police complaint alleging interference with its automated data processing systems. Well-timed Polymarket bets on the temperature in Paris saw traders walk away with more than $35,000—triggering a police complaint from France's national weather agency. On April 6 and again on April 15, temperature readings from a sensor operated by Météo France, the French government's official weather agency, near the Paris-Charles de Gaulle airport runway spiked by more than three degrees Celsius before snapping back to normal within minutes, French broadcaster *BFMTV* reported. Multiple accounts appeared to have placed large bets on long-shot outcomes on the markets, according to the *Financial Times*. Per *BFMTV*, one trader made $14,000 trading on a market linked to the sensor on April 6, with a stake of "only a few dozen dollars." Blockchain analytics platform Bubblemaps flagged another such trade made on April 15 in a Wednesday post, noting that one account purchased "NO" shares on an 18°C outcome when odds sat below 1%, spent roughly $120, and exited with around $21,000, a 180x return, within 30 minutes of the spike. "While this trader has a long history in weather markets, this bet stands out," Bubblemaps wrote. "His average bet: $6 at 72% odds. This one: $120, 20x larger, at 0.6% odds — placed minutes before the anomaly." Météo France has since filed a complaint for “interference with the operation of an automated data processing system” with the Roissy Air Transport Gendarmerie Brigade, “in light of physical findings on one of our instruments and the analysis of sensor data,” a spokesperson for the weather agency told *Decrypt*.
6/ Who is this trader?
Did they get lucky and catch a break, or did they know something?
— Bubblemaps (@bubblemaps) April 22, 2026
Single points of failure
Q&A
What caused the $35,000 payouts on Polymarket?
The payouts were triggered by temperature spikes at a Météo France sensor, which resolved long-shot weather bets in favor of traders.
What actions did Météo France take regarding the sensor anomalies?
Météo France filed a police complaint alleging interference with its automated data processing systems due to the temperature anomalies.
Who is the trader that made a $21,000 profit on Polymarket?
The trader, who has a history in weather markets, placed a $120 bet on an 18°C outcome just minutes before the temperature spike, resulting in a 180x return.
What are the implications of the Polymarket incident for prediction markets?
The incident highlights vulnerabilities in prediction markets that rely on single data points, raising concerns about market integrity and potential manipulation.
