A Bloomberg investigation has uncovered widespread manipulation risks in prediction markets, particularly when they intersect with politics and geopolitics. A Stanford University study published on July 15, 2026 found that one-sided trading bursts on Binance were moving Bitcoin prices just seconds before Polymarket’s 5-minute bet resolutions. Bloomberg’s analysis of approximately 34,000 flagged trades between August 2025 and June 2026 recorded roughly $200 million in suspicious trading volume in just the first half of 2026. The top 1% of profitable wallets among those flagged captured more than half of all winnings, and 57% of flagged wallets were created less than 24 hours before trades occurred. The CFTC issued guidance on March 12, 2026, Polymarket referred nearly 100 suspicious wallets to law enforcement, and Kalshi banned politicians and athletes from certain betting activities.
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