Study Finds Signs of Manipulation in Bitcoin Bets on Polymarket

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A new academic study has found signs of settlement manipulation in short-duration Bitcoin prediction markets on Polymarket, raising fresh questions about market design, retail protection and the reliability of crypto-linked event contracts. The paper, titled “Settlement Manipulation in Prediction Markets,” was written by David Dai, Ruizhe Jia and Shihao Yu, with affiliations reported by Cointelegraph as Stanford University and Singapore Management University. The researchers studied Polymarket’s five-minute Bitcoin prediction markets, which allow users to bet on whether Bitcoin’s price will be above or below a reference level at settlement. Polymarket describes itself as the world’s largest prediction market. The study argues that contracts tied to financial asset prices are uniquely vulnerable because traders can participate in both the prediction market and the underlying spot market. In theory, a trader with enough exposure to a short-term prediction contract can profit by moving Bitcoin’s spot price around the settlement window, even if the price move quickly reverses afterward. The researchers found that after Polymarket launched five-minute Bitcoin contracts, spot-market order flow spiked near settlement times and was followed by large price reversals. That pattern is consistent with temporary price pressure rather than ordinary information-driven trading. The study also concluded that sophisticated manipulators captured significant profits, mostly at the expense of retail traders. The key problem is timing. In a five-minute binary contract, the payout depends on a single near-term price observation. That creates a concentrated window in which small changes in the underlying asset can determine whether one side of the contract pays out. If a trader has a large enough position in the prediction market, it may become profitable to trade Bitcoin itself to influence the settlement price. The trader may lose money on the spot-market trade, but gain more from the prediction-market payout. Once the contract settles, the artificial spot-market pressure can disappear, causing the price to reverse. This is different from ordinary market prediction. A healthy prediction market is supposed to aggregate information and produce a useful probability. A manipulable settlement market can instead reward traders who can temporarily push the underlying price across a threshold. The paper’s most important finding is that manipulation was largely absent in Polymarket’s fifteen-minute Bitcoin contracts. That suggests the problem is not prediction markets in general, but very short-duration contracts that settle on asset prices participants can influence. By lengthening the contract horizon, the researchers argue, platforms can reduce the profitability of manipulation and improve market quality. The findings arrive as prediction markets are moving further into mainstream finance. Platforms such as Polymarket and Kalshi have attracted billions of dollars in trading volume across politics, sports, economics, crypto and cultural events. Supporters argue they provide real-time probabilities and crowd-sourced information. Critics warn that thin liquidity, whale activity and asymmetric sophistication can distort prices. Bitcoin contracts are especially sensitive because the underlying asset trades continuously across global venues and can be moved over short windows, particularly when liquidity is fragmented. A trader does not need to control the entire Bitcoin market to influence a narrowly defined settlement point. For regulators, the study raises a familiar derivatives-market concern: contracts can create incentives to manipulate the reference price. Traditional futures and options markets have rules around settlement methodology, position limits, surveillance and anti-manipulation enforcement. Prediction markets tied to financial assets may face pressure to adopt similar safeguards. Related: Polymarket Seeks U.S. License to Offer Margin Trading Legally For retail traders, the lesson is practical. Very short-term prediction markets may look simple, but they can be structurally complex. A five-minute Bitcoin bet is not just a view on price direction. It may also expose users to settlement games played by better-capitalized traders operating across multiple venues. The study does not prove that every short-duration Bitcoin contract is manipulated. But it does show that market design can create incentives for manipulation and that onchain prediction markets are not immune from classic financial-market abuses. As prediction markets expand, the integrity of settlement mechanisms may become as important as the accuracy of the predictions themselves.

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A study on Bitcoin betting on the Polymarket found evidence of manipulation. According to the study, Bitcoin prices were manipulated between December 2021 and June 2022. This study provides important information to investors, and they should be cautious when making investment decisions regarding Bitcoin prices.

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This study found evidence of manipulation in the Bitcoin betting market on Polymarket. The study covers the period from December 2021 to June 2022, during which time Bitcoin prices were manipulated. This manipulation has important implications for investors, who should be cautious when making investment decisions regarding Bitcoin prices.

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