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Columbia University researchers have uncovered substantial evidence of artificial trading activity on the prediction market platform Polymarket. The study suggests that a significant portion of the platform's trading volume may not be organic, raising concerns about market integrity and the true growth of decentralized prediction markets.
Key Takeaways
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A Columbia University paper found extensive wash-trading on Polymarket, particularly starting in July 2024.
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Wash trades reportedly accounted for nearly 60% of Polymarket's total trading volume in July 2024.
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Over the past three years, researchers estimate 25% of Polymarket's total trading volume was due to artificial trading.
Findings of the Research Paper
A recently published, though not yet peer-reviewed, 80-page paper by Columbia University researchers titled “Network-Based Detection of Wash-Trading” details significant wash-trading activity on Polymarket. This artificial trading was observed to have begun in July 2024, with wash trades comprising almost 60% of the platform's total trading volume during that month. The activity reportedly continued until late April 2025 before decreasing, only to rise again to approximately 20% of the volume in early October 2025.
The researchers concluded that over the last three years, an estimated 25% of Polymarket's total trading volume can be attributed to artificial trading. One of the paper's co-authors, Columbia University professor Yash Kanoria, expressed hope that Polymarket would welcome the analysis. The authors suggest that Polymarket's operational structure may have contributed to this wash trading.
Understanding Wash Trading
Wash trading is a fraudulent practice where an individual or entity simultaneously buys and sells the same asset. This creates a misleading appearance of market activity, potentially manipulating prices and deceiving investors about genuine demand and liquidity. In the United States, wash trading is illegal due to its manipulative nature.
Broader Implications for Prediction Markets
These allegations cast a shadow over the rapid growth of Polymarket and the broader sector of blockchain-based prediction markets. These platforms gained considerable attention, notably during the 2024 US presidential election cycle, for their accuracy in forecasting outcomes. Polymarket's increasing popularity had positioned it for a potential $10 billion valuation amidst funding round rumors.
Polymarket is recognized as a leading decentralized prediction platform, enabling users to place bets on real-world events without central bookmakers. The platform was reportedly preparing for a re-entry into the US market in November, following a no-action letter issued by the Commodity Futures Trading Commission (CFTC) to a clearinghouse it acquired.
Sources
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