Key Highlights
- Polymarket’s data bug may have doubled reported trading volumes, highlighting risks in dashboard reporting and transparency in prediction markets.
- Researchers found redundant trade events inflate Polymarket’s volumes, raising concerns about data accuracy and investor trust in crypto prediction platforms.
- A critical bug makes Polymarket’s numbers misleading, showing how on-chain event reporting can distort actual market activity for users and analysts.
Polymarket, a leading crypto prediction platform, may have overstated its trading activity because of a critical data bug. Paradigm Founder Matt Huang flagged the issue, noting that many public dashboards are effectively double-counting trades, potentially giving a misleading picture of market volume.
Huang highlighted the problem by sharing a thread by Paradigm’s data analyst Storm on X. He stated, “Polymarket data bug: volumes are double-counted in most public data. Interesting find in diligence from @notnotstorm.” The bug affects both the number of contracts traded and the cash value of those trades, potentially inflating reported volumes across the platform.
The anomaly arises from Polymarket’s use of on-chain OrderFilled events. Storm explained, “almost every major dashboard has been double-counting Polymarket volume. This is because Polymarket’s onchain data contains redundant representations of each trade.”
For instance, a simple $4.13 YES token trade may trigger two separate OrderFilled events, which most dashboards mistakenly sum as $8.26. Consequently, standard reporting methods can present a distorted view of actual market activity.
How the bug inflates volumes
The bug impacts both notional volume—the number of contracts traded—and cashflow volume—the dollar value of trades. Storm emphasized, “this bug inflates both metrics for all trades on the platform.”
Similarly, researcher Dan Smith noted that summing OrderFilled events includes both maker and taker volumes. He provided examples where simple $7.98 trades appear as $15.96, while complex trades involving position merges inflate further. “So summing OrderFilled events totals $6899.8 for an order size of just $90,” Smith illustrated, underscoring the scale of double-counting.
Storm created a tool that mimics Polymarket’s different trade types and found the same duplicate counting in every case. He also checked the platform’s contract data and on-chain records, which all confirmed that dashboards are overstating volumes. He emphasized that this issue has nothing to do with wash trading.
Impact on market perception
A sensitive time for a bug to pop up. Just last month, Polymarket returned to the US, offering its app to waitlisted users after receiving a no-action letter from the Commodity Futures Trading Commission (CFTC). The platform now hosts regulated prediction markets, beginning with sports and extending into politics, crypto, and global events soon.
Polymarket also faces increasing competition from competitors like Kalshi. Therefore, it becomes very important for investors and market analysts to report trading activity as accurately as possible.
In the meantime, another incident added to market volatility: a now-viral fake message claimed that a Token Generation Event (TGE) for Lighter had been postponed. The misleading information sent the Polymarket “Yes” odds plummeting from 85% to 22% in less than a few minutes.
ProMint, an X user, said the message was indeed fake. Meanwhile, users saw sharp swings in market predictions; this highlighted the vulnerabilities of social news and crypto channels.
Dune Analytics reported last week that volumes at Polymarket reached $3.7 billion in November. If Paradigm’s research is accurate, the true volume would be approximately $1.85 billion, a 50% reduction that users and market analysts must cautiously interpret The discrepancy fuels questions about transparency and market confidence.
Polymarket’s bug shows that reported trading volumes may be misleading. Users should interpret market numbers cautiously, and accurate reporting is essential as the platform operates under U.S. rules.
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