News & Updates
The latest news and updates from companies in the WLTH portfolio.
Polymarket Users Pocket $37K After Paris Weather Feed Error Sparks Integrity Concerns
Two Polymarket accounts have come under scrutiny after pocketing more than $37,000 from prediction markets tied to two unusual temperature readings at a weather station located inside France's largest airport. The markets tracked the highest temperature in Paris on April 6 and April 15, using data from the Charles de Gaulle Airport station, measured in degrees Celsius. French outlet BFMTV reported on Monday that the April 6 reading briefly climbed above 21 degrees Celsius before dropping back down. That market resolved with a single winner collecting more than $16,000. Blockchain analytics platform Bubblemaps flagged a near-identical pattern for the April 15 contract. The sensor held at roughly 18 degrees Celsius for most of the day before spiking to 22 degrees Celsius and sliding back shortly afterward. "That spike didn't show on nearby stations," Bubblemaps analysts wrote in a post on X, comparing the Charles de Gaulle reading with outputs from other French weather sensors. The firm noted that moments before the jump, a single trader began accumulating "NO" shares on the 18-degree outcome, later cashing out with more than $21,000. The episode arrives as prediction markets face heightened scrutiny worldwide over alleged insider trading and possible violations of gambling laws. Ruben Hallali, a meteorologist interviewed by BFMTV, said the timing and magnitude of the readings made a natural explanation difficult to accept. He described the two-degree swings on those specific dates as highly improbable over such short windows, adding that the pattern suggested someone familiar with the sensors may have intervened to validate the bets. Météo France, the country's official government weather agency, has reportedly filed a formal complaint with the Roissy Air Transport Gendarmerie Brigade. The complaint alleges tampering with the operation of its automated data processing systems. The case has reignited a long-running industry debate about the reliability of real-world data feeds, known as oracles, that underpin blockchain-based prediction markets. A single compromised input can unilaterally determine the outcome of thousands of dollars in wagers, leaving platforms exposed to reputational and potential legal risk. Operators typically rely on authoritative feeds or multiple providers to reduce the risk of a single point of failure. Polymarket has not publicly addressed whether it will refund wagers or revise how weather data is sourced. The platform has previously adjusted market outcomes when external information proved inaccurate, though such interventions remain rare. For now, French investigators will determine whether the two spikes were genuine instrument faults or the result of coordinated manipulation. The outcome could have implications well beyond the $37,000 payout, potentially shaping how prediction markets verify information from physical sensors as the sector pursues broader regulatory acceptance across Europe and the United States.
Someone Used A Hair Dryer At Paris Airport To Win $34,000 In Polymarket Bets [Roundup]
Gary Leff is one of the foremost experts in the field of miles, points, and frequent business travel - a topic he has covered since 2002. Co-founder of frequent flyer community InsideFlyer.com, emcee of the Freddie Awards, and named one of the "World's Top Travel Experts" by Conde' Nast Traveler (2010-Present) Gary has been a guest on most major news media, profiled in several top print publications, and published broadly on the topic of consumer loyalty. More About Gary "
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Kalshi and Polymarket under scrutiny for instances of insider trading
"The Wolf of All Streets" podcast host Scott Melker discusses the latest instances of supposed insider trading activity at prediction markets, pointing to specific cases of major manipulation. "The Daily Wolf with Scott Melker" airs on Yahoo Finance every day at 12:00 p.m. Tune in for your daily dose of all things crypto. Make sure to also check out Yahoo Finance's new crypto hub to find the latest crypto-related news.
Polymarket Faces Integrity Questions as Paris Weather Bets Deliver $37,000 in Trader Gains
Two accounts came under scrutiny after Paris temperature markets reportedly paid them about $37,000 from contracts tied to official weather readings. The markets used the highest temperature recorded at Charles de Gaulle Airport on April 6 and April 15. On both days, short spikes settled the outcomes and triggered questions about possible interference with the data. French media, analysts, and meteorologists all focused on readings that rose sharply and then fell soon after.
$119 Polymarket bet on Paris' weather turns into $21K after unusual temperature spike, sparking official probe
Prediction markets may have a new insider-trading headache: weather manipulation. On April 15, an anonymous Polymarket trader made a long shot bet that 18 degrees Celsius would not be the highest temperature in Paris on that day. The market was based on temperature readings from a monitoring station at Charles de Gaulle International Airport. It was a cheap bet. The prediction market showed a more than 90% chance that the maximum temperature that day would be 18 degrees Celsius. The trader put in just $119, buying more than 21,000 "No" shares for six cents apiece. Then, at about 9 p.m., the temperature at the station unexpectedly spiked from about 16 to 22 degrees Celsius, before dropping back down. The user, who has since deleted his username, made more than $21,000 in profit. The trade garnered suspicion online and has since led to an official inquiry. Elenie Alfera, a spokesperson for Météo France, the country's official meteorological agency, told Business Insider it filed a complaint with the police over suspected tampering with its automated data system. Polymarket did not immediately respond to a request for comment. The individual Polymarket trader could not be reached. Polymarket and Kalshi allow users to bet on the weather in major cities, including maximum temperatures and the likelihood of specific events such as rain or snowfall. Both prediction markets have been the subject of insider trading concerns, particularly around bets based on government actions, such as the US capture of Venezuelan President Nicolás Maduro. In response, both platforms have taken steps to beef up enforcement against insider trading. On Wednesday, Kalshi announced that it had suspended and fined three congressional candidates who had bet on their own elections.
Polymarket Trader Wins $37,000 After Unusual Paris Temperature Spike; French Authorities Launch Probe
Strange temperature spikes at an important weather station in Paris have started an investigation. The unusual temperature fluctuations recorded at a key Paris weather station have sparked an official investigation after a trader on Polymarket reportedly earned around $37,000 from highly improbable bets. The wagers were linked to daily temperature prediction contracts based on data from a Météo-France monitoring station at Charles de Gaulle (CDG) Airport. ALSO READ | Govt Mulls Crackdown On Polymarket, Kalshi, Other Prediction Market Apps As Election Betting Spikes Authorities flagged irregularities on April 6 and April 15, when temperatures briefly spiked beyond expected levels before quickly normalising. On April 6, readings momentarily crossed 21°C, while on April 15, the temperature jumped to nearly 22°C after staying around 18°C for most of the day. These spikes depicted the highest recorded temperatures for the days mentioned, allowing some bets to pay out, according to Bloomberg. The 'Missing' Evidence & Insider Suspicion Data analysis firms Bubblemaps and NS3. AI identified a specific trader who seemingly anticipated these "impossible" spikes. Just minutes before the artificial surge on April 15, the trader aggressively bought "NO" shares on the 18°C threshold contract. This perfectly timed move allowed the trader to profit when the rogue reading pushed the official temperature above the limit, settling the market in their favor. ALSO READ | FM Sitharaman Flags 'Unprecedented' Threat From Anthropic's Mythos AI Model Official Legal Action Météo-France has taken the rare step of filing a formal police complaint, citing suspected sensor tampering or a cyber-intrusion into their automated reporting systems. The agency noted that no other nearby stations recorded similar spikes, suggesting a localized breach specifically at the CDG monitoring unit. Impact on Prediction Markets The incident has drawn attention to the vulnerability of data-dependent betting platforms (or "Oracles"). Polymarket relies on official government feeds to settle contracts; this breach demonstrates that if the "ground truth" source is compromised, decentralised platforms have no choice but to pay out on fraudulent data. Essential Business Intelligence, Continuous LIVE TV, Sharp Market Insights, Practical Personal Finance Advice and Latest Stories -- On NDTV Profit.
Winning Polymarket bets on strange temps at Paris airport spark tampering probe: reports
Mystery Polymarket traders raked in huge profits after correctly predicting an unusual temperature spike at a weather station in Paris-Charles de Gaulle Airport, prompting French officials to launch an investigation into suspected tampering. Polymarket, a leading prediction market, allows users to place bets on the maximum temperature based on readings at specific locations around the world. On April 15, the temperature in Paris was 18 degrees Celsius and trending downward when it inexplicably spiked to 22 degrees Celsius at 9:30 p.m. - before rapidly plunging again. Just before the spike, Polymarket user "xX25Xx" placed an approximately $120 bet that the day's top temperature in Paris would exceed 18 degrees Celsius - even as 99% of other users predicted it wouldn't, the Wall Street Journal reported, citing data from analytics firm Bubblemaps. The user earned more than $21,000 in profit on the trade. A similar incident reportedly occurred on April 6, when a Polymarket user called "Hoaqin" earned nearly $14,000 after predicting that the temperature in Paris, which had peaked at 18 degrees Celsius late that afternoon, would hit 21 degrees. Météo-France, the country's weather forecasting office, examined its sensors at the airport and ultimately filed a complaint with local police due to concerns that someone had meddled with the system, a spokesperson told the Journal. Tampering with temperature sensors in airports is potentially dangerous because airlines and air traffic controllers rely on accurate data to safely operate flights. Polymarket representatives did not immediately answer a request for comment. Since the wagers, the prediction market has switched to gathering its weather data for Paris at a location in Paris-Le Bourget Airport, according to its website. Polymarket and Kalshi have faced growing scrutiny in recent months due to concerns that users could attempt to rig "prediction" bets in their favor. Recent incidents include a wave of bets on Polymarket that correctly predicted when the US would begin airstrikes on Iran, as well as a surge in trading activity on oil futures on March 23 just minutes before President Trump announced he wouldn't target Iran's power plants. Earlier this month, the White House warned staffers not to use any inside information to place bets.
Someone allegedly used a hairdryer to rig Polymarket weather bets
A hairdryer was allegedly used to rig Polymarket bets on the weather at Charles de Gaulle airport in Paris, . French authorities note that the official temperature readings at the airport spiked twice in the past month, reaching levels much higher than expected. On both occasions, gamblers on Polymarket appear to have walked away with thousands upon thousands of dollars by betting on those temperature fluctuations. The gambling site relies on readings from temperature sensors, and the one at Charles de Gaulle airport is on a public road. This makes it easy to access. The operating theory is that someone snuck in and used a battery-powered hairdryer to bring the recorded temperature up well beyond the actual heat outside. Meanwhile, the Polymarket page indicated less than a one percent chance of the airport exceeding a particular temperature. Successful bets on these fluctuations netted an unknown user around $34,000. "In view of physical findings on one of our instruments and the analysis of sensor data, Météo-France was indeed led to file a complaint for alteration of the operation of an automated data processing system with the Air Transport Gendarmerie Brigade of Roissy," a spokesperson for France's official weather agency said. There is no indication that Polymarket forced anyone to return their winnings, but the temperature sensor has been moved to a new location. The site is on the daily temperature in and around Paris. It sucks that someone potentially tricked a temperature sensor with a hairdryer to scam actual gamblers out of potential winnings. However, this sort of thing should be expected when betting money on real-world scenarios like this. If something can be rigged, and there's money to be made, it'll get rigged. Humans are gonna human. This does, however, shine a light on the types of bets that should be allowed on sites like Polymarket and Kalshi. Polymarket, for instance, hosts numerous bets on the , whether or not countries and , among many other sensitive topics. What happens when someone uses something much more dangerous than a hairdryer to change the outcome of something for financial gain?
Odd Weather Forecast Investigated After Polymarket Spike
French authorities are investigating potential tampering of critical weather sensors at Paris Charles de Gaulle International Airport that could be tied to prediction market trading. Temperature readings spiked on two evenings this month, beating highs recorded from the daytime. According to Bloomberg, the sensors are both critical to aviation operations at the airport and are also relied upon as official data points in prediction markets, where traders can bet money on certain weather trends. On the two days of suspected tampering, money flowed to temperature predictions at the French airport at more than double the usual volume. One account on Polymarket recorded $21,000 in profit betting on temperature at the airport. Meteorologists inspected the sensors, which spiked 39 degrees Fahrenheit one day and 41 degrees Fahrenheit on the other day. After investigating, they filed a report with airport police for tampering with the system, as Bloomberg reports. Hacking weather systems at an airport is especially dangerous, as temperature data is needed for departing and arriving aircraft and is used by air traffic control to plan routes and spacing between airplanes.
Vercel says some customer accounts were compromised prior to its early-April breach, potentially through social engineering, malware, or other methods
@itsmarkmoran: YES, I did bet ~$100 on myself on Kalshi because I wanted to get caught... After discovering potential manipulation on polymarket in the NYC mayoral race (NY Post reported on this) I realized how rife with corruption kalshi is...I mean death markets...come on.... Today, we're releasing notices related to three enforcement investigations. All three cases concern political insider trading and were flagged because of our newly released safeguards to block political candidates from trading on their own elections. Kalshi does not tolerate anyone cheating or skirting the rules. Regulated exchanges must constantly evolve and adapt their systems to address insider threats.
Unusual Weather Bets on Polymarket Spur French Investigation
France's national weather service is investigating anomalous temperature spikes at Paris Charles de Gaulle Airport, leading to lucrative Polymarket payoffs. Prediction markets have spurred repeated allegations of skulduggery in recent months, ranging from insider trading by politicians to suspected rigging of bets on the Ukraine war. Now, controversy has erupted in one of their more sedate corners: wagers on the weather. France's national weather service is investigating irregularities at a monitoring station at Paris Charles de Gaulle Airport after it reported anomalous temperature spikes. The spikes led to lucrative payoffs for some traders on Polymarket, the crypto-based betting platform. The spikes drew the attention of local weather enthusiasts. Suspecting that traders had tampered with the data, they alerted the service, called Météo-France, which in turn notified French police. One mystery trader, with the username "xX25Xx," made more than $21,000 in profit from a bet of just under $120 thanks to one such temperature spike on April 15, according to Bubblemaps, a blockchain analytics firm. The trader has since deleted their Polymarket username, meaning they now show up as an unlabeled anonymous account. Every day, Polymarket lists contracts that allow its users to bet on the maximum temperature in dozens of cities worldwide. Its Paris contract is based on the reading at Charles de Gaulle airport, as reported by Weather Underground, an online weather data provider. On April 15, the temperature in Paris had reached 18 degrees Celsius in the afternoon and was cooling down in the evening when the airport gauge showed a brief, unexplained jump, hitting 22 degrees Celsius at 9:30 p.m. local time, Weather Underground data shows. Other nearby weather stations didn't show a similar spike. Just before the anomaly, xX25Xx placed cheap, long-shot bets on Polymarket that the maximum temperature in Paris that day wouldn't be 18 degrees Celsius, when other bettors were more than 99% sure that the day's top temperature would remain at that level. The airport weather station also registered a temperature spike around 7 p.m. on April 6. That day, a Polymarket account with username "Hoaqin" made nearly $14,000 in profit by betting that Paris temperatures would peak at 21 degrees Celsius, Polymarket data shows. Temperatures at Charles de Gaulle had been hovering at around 18 degrees in the late afternoon, according to Weather Underground data. Sébastien Brana was among several weather enthusiasts who noticed the unusual temperature activity and posted about it on an online weather forum run by Infoclimat, a nonprofit where Brana is a board member. "Someone apparently won $14k with a bet," Brana wrote. He later added that his group had alerted contacts at Météo-France -- an alert that he said "was taken very seriously." Brana didn't immediately respond to a request for comment. Météo-France confirmed that the weather service had examined one of its monitoring stations and analyzed weather-sensor data. The service has since filed a complaint with police at Charles de Gaulle airport related to tampering with an automated data system, spokeswoman Elenie Alfera said. A Polymarket spokesperson declined to comment. The traders behind the xX25Xx and Hoaqin accounts couldn't be reached. Polymarket has a data partnership with Dow Jones, the publisher of The Wall Street Journal. The weather trades took place on Polymarket's international platform. While the company recently launched a regulated betting platform for U.S. users, its international platform remains largely unregulated. Traders have periodically alleged attempts to rig the outcome of Polymarket's betting contracts by tampering with the sources used to determine answers to the yes-or-no questions that its users bet on. In November, some Polymarket users were upset by what proved to be a flawed determination that Russia had seized the Ukrainian town of Myrnohrad. Such bets are settled using an online map maintained by the Institute for the Study of War, a Washington think tank. Just as Polymarket's betting contract was set to expire, ISW's map erroneously showed Myrnohrad to be under Russian control, even though Russia hadn't actually captured the town. The think tank later apologized and fired an employee over the incident. In March, an Israeli journalist said he had received death threats from Polymarket bettors demanding that he revise his article about an Iranian missile strike on March 10. The details of his article were used to settle bets on whether Iran had carried out a missile, drone or airstrike that day. Soon after the incident, Polymarket explicitly prohibited insider trading and market manipulation on its international platform for the first time. The amended rules state that Polymarket users can't trade contracts where they can influence the outcome of the underlying event. A similar prohibition is in place in regulated prediction markets such as Polymarket's main competitor, Kalshi, as well as at Polymarket's new U.S. platform.
Netanyahu's rhetoric on Christians, Lebanon ops draw Polymarket attention
Netanyahu's rhetoric about protecting Christians and Israel's military operations in Lebanon have drawn attention on Polymarket. "Netanyahu out by June 30" trades at YES, while odds for his departure by April 30 sit at . Market reaction The YES odds for June 30 show traders see some possibility of political upheaval within 68 days but aren't betting heavily on it. The April 30 sub-market has barely moved, with traders skeptical about any near-term change to Netanyahu's tenure. The Israel x Hezbollah ceasefire by June 30, 2026 sits at 100% YES, despite aggressive military actions. This disconnect suggests traders are either mispricing risk or expecting diplomatic interventions to produce a ceasefire regardless of current operations. Why it matters Combined USDC volume across both Netanyahu markets is $5,970, a low figure that signals limited trader engagement so far. The June 30 market requires $11,869 to move 5 points, meaning the book is relatively thick and would need real liquidity to shift. The largest recorded move was a 1-point spike, so sentiment has been flat. What to watch Netanyahu's statements have drawn attention, but the tier-3 source reporting them limits their market impact. A YES share in the June 30 market at pays $1 if he leaves office, a return. That payout only makes sense if you expect significant political shifts or international pressure to materialize within weeks. Key catalysts: official statements from the Israeli Knesset or concrete international diplomatic moves. Either could change Netanyahu's political standing or accelerate ceasefire developments. API access
Hair dryer trick behind €25,000 win? France probes Polymarket bet scam
Officials in France have launched an investigation into the potential compromise of national weather sensors after a series of anomalous temperature readings coincided with betting activity on Polymarket. Météo-France has initiated an inquiry to determine whether the meteorological infrastructure managed by them was targeted by individuals seeking to influence prediction markets. This development follows reports of highly unusual temperature spikes that triggered significant financial payouts on the blockchain-based site Polymarket, where users place wagers on real-world events. Investigators are examining if the integrity of the national weather network was breached through physical or digital interference, as the precision of the winning bets suggests the actors involved may have had direct control over the reported data. Online rumors, which remain unverified for the time being, claim the temperature reading was manipulated by someone using a hair dryer to generate a higher temperature. Polymarket reportedly settles Paris temperature bets on a single Météo-France sensor sitting near the Charles de Gaulle airport perimeter. On 6 April, the reading from the sensor abruptly rose 4°C in twelve minutes, crossing the 22°C threshold despite data from other sources showing different figures. A user on Polymarket aggressively bet on readings above 21°C on that specific day, even though the consensus was lower at 18°C, and profited almost €30,000. A second similar anomaly occurred on 19 April leading to suspicions that the sensor was tampered with. Météo-France announced that it has filed a complaint with the Roissy air transport gendarmerie brigade "for [the] alteration of the operation of an automated data processing system," after an analysis of sensor data. Polymarket suspended its reliance on the compromised weather data source for Paris, shifting its resolution metric from the sensor in Charles de Gaulle airport to the one in Paris-Le Bourget airport. However, it did not cancel the contracts or refund the bets, leaving the resolved contracts final, even though on previous occasions it has suspended the resolution of certain bets until further clarification on the rules and circumstances. Decentralised 'oracles' and prediction markets This incident has reignited the debate over the reliability of the "oracles" that feed data to prediction markets in order to settle bets. In decentralised finance, an oracle is the mechanism that feeds external, real-world information into a smart contract to determine a financial outcome. Polymarket relies on these feeds to settle its contracts, often pulling data directly from official government websites. If the primary source of that data is corrupted, the betting market lacks any internal mechanism to verify the truth. Additionally, the decentralised nature of these platforms makes it difficult to freeze assets even if an investigation identifies the individuals behind suspicious trades. This is the latest case that highlights a new frontier of white-collar crime, where the manipulation of the physical world is used to exploit the vulnerabilities of automated prediction markets in order to win bets on real-world events.
French weather service alerts police to tampering after suspicious Polymarket bets
France's weather forecasting service has filed a police complaint after detecting anomalies in its temperature gauges at Paris-Charles de Gaulle airport, which coincided with a surge in well-timed bets on prediction market Polymarket. Météo-France filed the complaint alleging interference with its equipment after temperatures measured at the airport spiked by several degrees Celsius in the space of a few minutes on April 6 and 15. Users of weather forums who noticed the sudden movements said they may have been caused by people tampering with the equipment to shape the outcome of wagers on Polymarket. Multiple accounts on the platform, where traders can bet on real-world outcomes, appeared to have placed large bets on unexpected temperature rises in Paris. Polymarket uses Météo-France data recorded at Charles de Gaulle to settle wagers on the highest temperature of the day in the city. Predicting weather patterns has become a popular activity on the platform. On April 6, one wallet made $13,990 in profit on a stake of less than $30 after betting that the temperature in Paris would hit 21C. The account, which was opened this month, bought so-called event contracts when their price suggested the probability of a payout was just 0.2 per cent. On April 15, when the recorded temperature jumped in a few minutes from 18C to 22C before falling back, another wallet made more than $21,000 on a stake of just $119 by betting that the temperature that day would exceed 18C, at a time when the price of the contract suggested a probability of about 0.5 per cent. On both days, trading volume on Polymarket's "Highest temperature in Paris" market exceeded $500,000 -- more than double the typical daily volume for this market. Hunting for unusually confident or well-timed bets has become a flashpoint for prediction market traders on social media, although some warn that lucky or smart bets can be confused with market manipulation. While users can track traders' individual wallets and wagers on Polymarket, the crypto-based platform does not require most accounts on its international site to provide identification documents. This means that the company itself may not know who is behind a given wager. "In light of physical findings on one of our instruments and the analysis of sensor data, Météo-France has indeed been led to file a complaint for interference with the operation of an automated data processing system with the Air Transport Gendarmerie Brigade in Roissy," Météo-France said, declining to comment further. The complaint was first reported by broadcaster BFMTV. Sébastien Brana, who runs online weather forum Infoclimat, whose members track Météo-France data almost in real time, said members had not immediately suspected wrongdoing when the first anomalies occurred on April 6. "We thought it was an issue with the sensors . . . You can have sudden temperature changes at sundown when there is a storm as well. But the weather situation didn't explain what was happening," Brana said. "It became clear there was something else going on when it happened again on April 15." Météo-France has shared readings from its sensors since 2023, Brana said. Prediction markets, which allow customers to bet on binary outcomes of future events, have surged in popularity in recent years. However, the ability of users to make bets on highly specific real-world outcomes has triggered concerns that they are vulnerable to manipulation. The FT reported last month that the US attack on Iran was preceded by a number of unusually large and well-timed bets, and found a similar pattern of bets in a market related to the US government's capture of Venezuelan leader Nicolás Maduro in January. Israel in February brought prosecutions against two reservists suspected of using classified information to bet on the country's military operations. Regulations around the use of prediction platforms differ between countries. In the UK, for example, the Gambling Commission considers Polymarket and its rival Kalshi, the biggest regulated platform in the US, to be unlicensed betting operators. Polymarket, Paris police and airport police did not immediately respond to requests for comment.
Polymarket traders win $37K after Paris weather data glitch, raising suspicion1h
Ruben Hallali, a meteorologist, told French media outlet BFMTV the temperature glitch was unlikely to be a natural event. Two Polymarket accounts have attracted suspicion after making $37,000 betting correctly on two unusual temperature readings of a weather station located in a major airport in France. The two weather-focused prediction markets focused on the highest temperature in Paris on April 6 and 15, using the highest temperature recorded at the Charles de Gaulle Airport Station in degrees Celsius, according to Polymarket. French media outlet BFMTV reported on Monday that the temperature suddenly climbed to over 21 degrees Celsius on April 6, before dropping again immediately. The market resolved with the winner taking over $16,000. Meanwhile, blockchain analytics tool Bubblemaps reported a similar glitch for the April 15 market. The weather station showed 18 degrees Celsius most of the day, then suddenly spiked to 22 degrees Celsius before dropping back. Some have questioned whether foul play was involved. Prediction markets are already facing growing scrutiny over insider trading and possible violations of gambling laws. "That spike didn't show on nearby stations," Bubblemaps analysts said, adding that "Just before the spike, one trader started buying NO shares on "18°C," before exiting with over $21, 000. Ruben Hallali, a meteorologist, told BFMTV the temperature glitch was unlikely to be a natural event. Related: Charles Schwab, Citadel Securities are eying prediction markets "Such temperature variations seem very unlikely, especially on these two dates, and over such a short period. 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," he added. Météo France, the official government weather agency of France, has reportedly made a complaint with the police unit, the Roissy Air Transport Gendarmerie Brigade, for alleged tampering with the operation of its automated data processing systems.
Paris Weather Glitch Sparks $37K Win on Polymarket
Two Polymarket accounts are under scrutiny after they won about $37,000 from weather prediction markets tied to Paris temperatures. The contracts used the highest temperature recorded at the Charles de Gaulle Airport station on April 6 and April 15. On both dates, the market outcome appeared to turn on short-lived jumps in temperature readings. French outlet BFMTV reported that the station moved above 21 degrees Celsius on April 6 before quickly falling again. That result helped settle one market, with the winning side taking more than $16,000. A similar pattern appeared in the April 15 market. Bubblemaps said the station held near 18 degrees Celsius for most of the day, then briefly rose to 22 degrees Celsius before dropping back. The move helped decide the market and added to concerns around the data source. Bubblemaps said one trader bought NO shares on "18°C" just before the spike and later exited with more than $21,000 in profit. The analytics firm also noted that the jump did not appear on nearby stations. That detail added more attention to the timing of the trade and the recorded reading. Ruben Hallali, a meteorologist, told BFMTV that the sudden change did not look like a normal weather event. He said the movement in the readings over such a short time was hard to explain through natural conditions alone. "Such temperature variations seem very unlikely, especially on these two dates, and over such a short period," Hallali added. "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." Furthermore, Météo France, the country's official weather agency, has reportedly filed a complaint with the Roissy Air Transport Gendarmerie Brigade. The complaint concerns alleged tampering with its automated data processing systems linked to the weather station readings.
How a Hair Dryer Was Used to Reportedly Manipulate Polymarket
Météo France has filed charges, Polymarket swapped sensors, but the oracle flaw remains. A suspected manipulation of weather data tied to a prediction market payout has renewed scrutiny around the "oracle problem" in blockchain systems. The case centers on temperature readings from the Météo France temperature sensor at Charles de Gaulle Airport, which was reportedly used by Polymarket to settle bets on daily weather outcomes in Paris. The Polymarket Manipulation No One Anticipated According to media reports, on April 6, the station recorded a sudden spike to 21°C in the evening, an anomaly inconsistent with surrounding data. The move enabled a bettor to win approximately $14,000. A similar pattern emerged on April 15, when the sensor briefly jumped from 18°C to 22°C. Follow us on X to get the latest news as it happens Speaking to BFMTV and Le HuffPost, Météo-France confirmed on April 21 that it had filed a complaint for "tampering with the operation of an automated data processing system" with the air transport gendarmerie in Roissy. Following the incidents, Polymarket reportedly shifted its data source to Le Bourget Airport station (LFPB). Crypto's Oracle Problem Moved Off the Blockchain and Onto a Paris Runway In a post on X, podcast host Aakash Gupta argued that the core vulnerability remains unresolved despite reported changes to the data source. He noted that shifting to another nearby weather station does little to mitigate risk, describing it as replacing one exposed data point with another of similar security standards, effectively maintaining a single point of failure. "Every crypto whitepaper for the last decade has warned about the oracle problem. Someone finally demonstrated it for $34,000 using a hair dryer," he said. Gupta contrasted the sophistication of blockchain infrastructure with the fragility of its real-world inputs. While the underlying system executing these markets reflects years of technical development, he pointed out that the outcome still hinges on "airport equipment in a plastic box." He further suggested that this issue extends beyond weather-based contracts on Polymarket. According to Gupta, many prediction markets rely on a single authoritative data source for sports results, election outcomes, and other events. This structure, he argued, creates a repeatable attack surface: identify the weakest link in the reporting chain, influence the input, and benefit from the resulting market imbalance. "The hardest part of crypto is the chain. The weakest part is the thermometer," Gupta added. The episode reveals a persistent challenge for decentralized systems. While blockchain infrastructure can ensure deterministic and tamper-resistant execution, it remains only as reliable as the external data it consumes. BeInCrypto has reached out to Polymarket for comment.
Polymarket Traders Profit $37K From Paris Weather Glitch
Ruben Hallali, a meteorologist, told French media outlet BFMTV the sudden temperature fluctuation recorded at a weather station at the Charles de Gaulle Airport was unlikely to be a natural event. Two Polymarket accounts have attracted suspicion after making $37,000 betting on the temperature readings of a weather station located in a major airport in France, which produced two unusual readings leading to their win. The two weather-focused prediction markets focused on the highest temperature in Paris on April 6 and 15, using the highest temperature recorded at the Charles de Gaulle Airport Station in degrees Celsius, according to Polymarket. French media outlet BFMTV reported on Monday that the temperature suddenly climbed to over 21 degrees Celsius on April 6, before dropping again immediately. The market resolved with the winner taking over $16,000. Meanwhile, blockchain analytics tool Bubblemaps reported a similar glitch for the April 15 market. The weather station showed 18 degrees Celsius most of the day, then suddenly spiked to 22 degrees Celsius before dropping back. Some have questioned whether foul play was involved. Prediction markets are already facing growing scrutiny over insider trading and possible violations of gambling laws. "That spike didn't show on nearby stations," Bubblemaps analysts said, adding that "Just before the spike, one trader started buying NO shares on "18°C," before exiting with over $21, 000. Ruben Hallali, a meteorologist, told BFMTV the temperature glitch was unlikely to be a natural event. Related: Charles Schwab, Citadel Securities are eying prediction markets "Such temperature variations seem very unlikely, especially on these two dates, and over such a short period. 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," he added. Météo France, the official government weather agency of France, has reportedly made a complaint with the police unit, the Roissy Air Transport Gendarmerie Brigade, for alleged tampering with the operation of its automated data processing systems.
Polymarket Bettor Uses 'Hair Dryer' To Change The Weather In Paris, Prediction Market Manipulation Contro
In a bizarre incident in Paris, a Polymarket bettor reportedly used a hair dryer to manipulate the temperature at a sensor at the Charles-de-Gaulle airport in order to win a contract, and was able to do it not once, but twice. Rise In Temperature According to a report by Le Monde, a probe placed at the Charles-de-Gaulle airport in Paris recorded an abnormal increase in temperatures on April 6 and 15, prompting questions from climate data enthusiasts. Around 6:30 PM on April 6, the temperature recorded at the sensor rose by four degrees in a matter of 12 minutes and then dropped five minutes later, prompting questions. The same thing again on April 15. Polymarket Contract Reveals More The situation became clearer when users found the contracts on Polymarket and noticed that one user had bet on temperatures rising to 21 degrees Celsius on April 6 and won $14,000. Another user won $20,000 on a similar bet on April 15. People on the contract page have called out the event, alleging manipulation, stating that the data was manipulated to benefit certain bettors. Polymarket did not immediately respond to Benzinga's request for a comment. Climate enthusiasts have also called out the incident, with some members saying that the sensor was manipulated using a "hair dryer." Meteo-France, the official meteorological department, which owns the probe, has filed a complaint for "alteration of the operation of an automated data processing system," according to the report. White House Warns Staff The White House, earlier this month, warned staff against insider trading in the prediction market after three newly created Polymarket accounts pocketed over $600,000 by betting on the Iran ceasefire. Photo courtesy: Shutterstock Market News and Data brought to you by Benzinga APIs To add Benzinga News as your preferred source on Google, click here.
MeitY examines action against Kalshi, Polymarket amid rise in election and sports prediction betting
Government says offshore prediction platforms face restrictions under online gaming rules; VPN use complicates enforcement. The Ministry of Electronics and Information Technology (MeitY) is evaluating potential regulatory action against offshore prediction market platforms such as Kalshi and Polymarket, following a rise in their use for speculative betting on events including elections and sporting tournaments like the Indian Premier League. Speaking on April 22, IT Secretary S. Krishnan said the government has been monitoring instances of Indian users accessing such platforms despite existing restrictions. He noted that action has been taken whenever specific reports have been brought to the ministry's attention. According to officials, platforms like Kalshi and Polymarket are considered to fall within the scope of India's online gaming and betting restrictions under the current legal framework. The IT ministry also notified the rules under the Online Gaming Act on April 22, reinforcing the regulatory stance. Also read: Breaking: MeitY outlines lighter regulatory framework for online games; determination not mandatory for most titles However, enforcement continues to face operational challenges. Users are reportedly accessing these platforms through virtual private networks (VPNs), making direct blocking and monitoring difficult. Krishnan acknowledged this complexity, stating that while VPNs themselves are not illegal, their use in bypassing restrictions poses regulatory concerns. He described the situation as a "whack-a-mole" problem, with restricted platforms resurfacing through mirror websites, alternate domains, and encrypted access routes even after enforcement action. Also read: MIB issues advisory on IPTV self-declaration process, warns against intermediaries The renewed scrutiny comes as prediction markets gain traction among Indian users, particularly for high-engagement events such as elections and major sports fixtures, raising concerns around speculative betting activity operating outside domestic regulatory oversight.
