Over $600M in Wash Trading Hits Polymarket on Concluded Elections

Two global election markets on Polymarket generated over $600M in trading volume, heavily driven by contracts tied to long-shot candidates who ultimately lost. An analysis of 38,000 post-election trade loops in the Ethiopian market found that over 98% resulted in no financial gain or loss, with accounts holding contracts for a median of nine seconds. Researchers from Barnard College created an algorithm that flagged 99.6% of the volume in Polymarket's Romanian election market as wash trading during certain weeks. The anomalous trading patterns are widely attributed to "activity farming," where users artificially inflate transaction metrics to secure allocations of a potential future Polymarket cryptocurrency token. Polymarket representatives stated that the platform identified the suspicious activity, investigated the trades, and subsequently blocked the involved accounts. "Nearly all of it—about $284 million—came from pairs of accounts repeatedly buying and selling with each other." — Chris Park