Researchers from Stanford University and Singapore Management University have documented systematic price manipulation on Polymarket's five-minute Bitcoin prediction markets, with suspected manipulators generating approximately $8.2 million in illicit gains over a two-month period.
The study analyzed trading data and identified 821 probable manipulators who exploited a vulnerability in market mechanics by placing one-sided spot orders on Binance during the final seconds before contract settlement. These coordinated trades briefly pushed the BTC price toward outcomes favorable to their Polymarket positions, allowing them to profit from the artificial price movement before the futures market settled.
Retail traders absorbed the majority of losses from this manipulation strategy. The findings underscore structural weaknesses in decentralized prediction markets where settlement mechanisms rely on external price feeds vulnerable to short-term manipulation. The research raises questions about market surveillance and participant protection mechanisms across derivatives platforms that reference spot market prices.