Polymarket Traders Profit $37K From Paris Weather Station Glitch, Sparking Tampering Investigation

Two Polymarket traders netted $37,000 after correctly betting on unusual temperature spikes at a Paris airport weather station, prompting French authorities to launch a tampering investigation into what meteorologists say were unlikely natural events.

The suspicious trades occurred across two separate prediction markets focused on maximum daily temperatures at Charles de Gaulle Airport on April 6 and April 15. Both markets resolved after the weather station recorded sudden temperature spikes that immediately dropped back to normal levels.

French media outlet BFMTV reported on Monday that on April 6, the temperature suddenly climbed to over 21 degrees Celsius before dropping again immediately. The market resolved with one winner taking over $16,000 in profits.

A similar pattern emerged on April 15, according to blockchain analytics firm Bubblemaps. The weather station displayed 18 degrees Celsius for most of the day, then suddenly spiked to 22 degrees Celsius before dropping back down.

“That spike didn’t show on nearby stations,” Bubblemaps analysts noted in their report. “Just before the spike, one trader started buying NO shares on ’18°C,’ before exiting with over $21,000.”

The timing and profitability of the trades have raised red flags about potential manipulation. Ruben Hallali, a meteorologist, told BFMTV the temperature fluctuations were unlikely to be natural phenomena and speculated that someone may have tampered with the equipment onsite.

“Such temperature variations seem very unlikely, especially on these two dates, and over such a short period,” Hallali said. “We can imagine that an individual with a good understanding of how the sensors work intervened, resulting in temperatures rising by two degrees at the right time, to validate a bet.”

The incidents have prompted Météo France, the country’s official government weather agency, to file a formal complaint with police. The complaint was submitted to the Roissy Air Transport Gendarmerie Brigade for alleged tampering with automated data processing systems.

The Charles de Gaulle Airport weather station serves as an official data source for temperature readings in the Paris region. Its readings are used for various purposes beyond prediction markets, making any potential tampering a serious matter for French authorities.

Polymarket’s weather-focused prediction markets use publicly available weather station data to resolve bets and wagers on specific temperature outcomes, with markets resolving based on the highest recorded temperature at designated weather stations.

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Now, the controversy adds to growing scrutiny facing prediction markets over potential insider trading and gambling law violations. Prediction platforms have faced increasing regulatory attention as they’ve grown in popularity and trading volume.

The investigation comes at a time when traditional financial institutions are showing heightened interest in prediction markets. Charles Schwab and Citadel Securities have both reportedly been exploring opportunities in the prediction market space.

Bubblemaps’ analysis revealed suspicious trading patterns that preceded both temperature spikes. The blockchain analytics tool tracks on-chain transactions to identify unusual trading behavior and potential market manipulation.

Weather-based prediction markets have become increasingly popular on Polymarket, offering traders the ability to speculate on meteorological events using cryptocurrency. However, the reliance on external data sources like weather stations creates potential vulnerabilities for manipulation.

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The incident highlights the challenges prediction platforms face in ensuring data integrity when using real-world information sources. Unlike markets that resolve based on blockchain data, weather markets depend on external systems that may be susceptible to tampering.

French authorities have not yet announced any arrests or identified suspects in the alleged tampering case. The investigation by the Roissy Air Transport Gendarmerie Brigade is ongoing as police examine the weather station equipment for signs of interference.

The $37,000 combined profit from the two trades represents a significant return for the traders involved, though it remains unclear whether the same individuals were behind both winning positions. Blockchain analysis may help investigators trace the funds and identify the accounts’ controllers.