Météo-France Files Police Complaint Over Paris Temperature Sensor Anomaly Linked to $35K Polymarket Payouts

France's national weather service Météo-France has alerted law enforcement after data anomalies at Paris temperature sensors coincided with significant payouts on Polymarket, the decentralized prediction platform. The dispute centers on a market wagering on daily maximum temperatures in the French capital, where certain bets returned roughly $35,000 to successful punters. The timing and scale of the payouts prompted officials to flag potential sensor interference, triggering a formal complaint now under review by police authorities.

The market in question operated on Polymarket's infrastructure, allowing users to take positions on whether specific temperature thresholds would be exceeded on given days in Paris. Sources familiar with the matter indicate that the affected sensors recorded readings consistent with the winning conditions for these long-shot wagers. Météo-France, which maintains the official measurement network for France, reportedly detected irregularities that could not be explained by meteorological factors alone. The agency's decision to escalate the matter to law enforcement marks an unusual intersection between climate data infrastructure and the rapidly growing prediction market ecosystem.

The incident has drawn scrutiny to the integrity of external data feeds used by decentralized platforms to settle market outcomes. Polymarket relies on third-party sources to verify events described in its contracts, a process that becomes complicated when those sources themselves can be subject to tampering. The company has not publicly commented on the specific complaint, and authorities have not disclosed details about the scope of their investigation. The case raises questions about the vulnerability of event-based markets to manipulation at the data source level, particularly as prediction platforms expand into categories beyond politics and sports into environmental and scientific domains.