According to a Paradigm researcher, reported trading activity and volume on the prediction market platform Polymarket have been significantly inflated due to a data bug causing double-counting. The issue stems from Polymarket's complex onchain data, which emits redundant "OrderFilled" events for both makers and takers in a single trade. Major dashboards, including DefiLlama and Dune Analytics, mistakenly counted these as separate trades. This error impacts both notional and cashflow volume metrics. The discovery raises questions about Polymarket's recently reported success, including a $9 billion valuation from ICE based on potentially overstated volume figures. The researcher calls for more consistent and transparent reporting standards as prediction markets mature.

<html><head></head><body>Some of the reported trading activity and volume of prediction market platform Polymarket may be significantly higher than actual reality due to a “data bug,” according to a researcher at Paradigm.“It turns out almost every major dashboard has been double-counting Polymarket volume not related to wash trading,” said Storm, a researcher at the venture capital firm. Storm explained that this was because “Polymarket’s onchain data contains redundant representations of each trade.”<blockquote data-ct-non-breakable="undefined">“Polymarket’s onchain data is quite complex, and this has led to widespread adoption of flawed accounting methods.” </blockquote>When trades occur on Polymarket, the system emits multiple “OrderFilled” events: one set for makers, who have existing orders, and another for takers, who execute the trade. These events describe the same trade from different perspectives, not separate trades. However, many major dashboards have been combining them, counting the same volume twice.Polymarket has been seen as a rare crypto success recently, as spot and derivatives markets have been in turmoil. The discovery that its headline metric may be incorrect across many dashboards could dent some of its perceived success. <h2>Polymarket’s complex blockchain data </h2>The researcher went on to explain that the accounting bug “inflates both types of volume metrics commonly used for prediction markets, notional volume and cashflow volume.” <blockquote data-ct-non-breakable="undefined">“Polymarket’s data has been notoriously confusing for crypto data analysts ... the data has too many layers of interacting complexity to untangle using just a block explorer.”</blockquote>Related: Polymarket plans to use in-house market maker to trade against users: Report This complexity arises because Polymarket trades can be simple swaps or they can be “splits” and “merges” where both parties exchange cash for opposing positions. The smart contracts emit redundant events for tracking purposes, and standard blockchain explorers don’t make this distinction clear, the researcher stated. Cointelegraph contacted Polymarket for comment, but did not receive an immediate response. <figure> <div><img style="max-width:100%;overflow:hidden;" src="https://d1x7dwosqaosdj.cloudfront.net/images/2025-12/fe72c726b8634dbeab967d64bbdc62e0.jpg" alt=""></div><figcaption style="text-align: center;">Polymarket volumes using different metrics. Source: Paradigm </figcaption></figure><h2>Polymarket is valued at $9 billion</h2>The Intercontinental Exchange (ICE) valued the prediction platform at $9 billion this week, according to reports, citing $25 billion in trading volume, which could now be in question.In September, it was reported that Polymarket was preparing for a US launch at a $10 billion valuation. In October, Bloomberg reported that it was looking to raise funds at a valuation between $12 billion and $15 billion. Meanwhile, Dune Analytics reported that the platform achieved a monthly record of $3.7 billion in trading volume in November, but this may be double the actual figure if Paradigm’s research is correct. “DefiLlama, Allium, Blockworks and many Dune dashboards were double-counting,” said the researcher. Prediction markets are rapidly evolving into a critical financial sector, “and as the category matures, the industry should converge on consistent, transparent, and objective reporting standards,” the researcher concluded. Magazine: XRP’s ‘now or never’ moment, Kalshi taps Solana: Hodler’s Digest<template data-name="subscription_form" data-type="crypto_biz" label="Subscription Form: Crypto Biz Newsletter"></template>
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