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France Probes Suspected Tampering of Paris Airport Weather Sensor Tied to Polymarket Payouts

The case spotlights how single-station data used to settle bets can be manipulated with outsized consequences.

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French authorities are investigating potential tampering with weather sensors at the country's busiest airport. REUTERS/Charles Platiau (FRANCE).
The sun sets over the River Seine on a mild afternoon as viewed from the Pont Alexandre III bridge, with the Eiffel Tower in the background, in Paris on March 9, 2026.
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Overview

  • Météo-France, which disclosed Thursday it had filed a police complaint, says its automated station at Paris–Charles de Gaulle showed anomalies that led to a criminal probe.
  • At the airport site, temperatures briefly jumped about 4–5°C on April 6 and April 15, setting each day’s high and helping resolve Polymarket markets that paid roughly $34,000–$37,000.
  • Blockchain firm Bubblemaps flagged a wallet that bought low-odds “NO” shares minutes before the April 15 spike with about $120, then exited with around $21,000 as nearby stations showed no similar rise.
  • Authorities have not identified a suspect or confirmed a method, and online claims that a hairdryer was used to heat the sensor remain unverified.
  • Under scrutiny, Polymarket switched its Paris temperature source to the Le Bourget station on April 19, a change experts say underscores the need to average data across stations to protect markets and flight operations.