French Police Probe Alleged Weather Sensor Tampering After Half‑Million‑Dollar Bets on Polymarket

French authorities are investigating potential weather sensor tampering after large sums were wagered on Polymarket, coinciding with unusual temperature readings in Paris. This probe highlights concerns about the integrity of data used by online prediction markets.

French police have initiated an investigation into alleged tampering with a weather sensor at Paris’s Charles de Gaulle airport. This probe follows a series of unusual temperature readings that coincided with significant online wagers on Polymarket, a blockchain-based prediction market.

Polymarket allows users to bet on the outcome of future events, with real-world temperature readings serving as resolution metrics for certain markets. On several days, over half a million dollars was wagered on Polymarket bets tied to Paris temperature readings.

Speculation arose regarding sudden temperature shifts. This prompted one bettor to ask another, "What did you do to the temperature sensor at Paris airport yesterday? Was your weapon of choice a hairdryer or a lighter?"

Météo-France, France's national meteorological service, filed a complaint. The French police's cybercrime division is now investigating the alleged tampering.

Polymarket has since ceased using the Charles de Gaulle sensor for its markets, shifting to a different location at Paris-Le Bourget airport. The platform did not cancel existing contracts or refund past bets.

This incident, alongside other reports of potential influence on data sources for Polymarket, highlights growing concerns. The potential for physical or digital manipulation of data sources could impact the reliability of these platforms.

As prediction markets expand and their data gains influence, the susceptibility of underlying metrics to interference becomes a critical concern for market participants and observers alike. Traders and institutional investors have started using Polymarket data to inform strategies, increasing the stakes for data accuracy.

Observers will now watch for the investigation's findings and any policy responses from prediction market platforms to safeguard against future tampering incidents.