Key Takeaways
- Stanford and SMU researchers discovered 821 merchants took $8.2 million from Polymarket’s 5-minute bitcoin bets.
- Web order circulate on Binance jumped about 50% within the closing 10 seconds earlier than settlement, the examine discovered.
- The paper says 15-minute contracts present far much less abuse, pointing to longer settlement home windows because the repair.
Placing New Findings Emerge
Polymarket’s quickest bitcoin betting product exhibits systematic indicators of settlement manipulation, in accordance with a brand new examine by David Dai and Ruizhe Jia of Stanford College’s Division of Administration Science and Engineering and Shihao Yu of Singapore Administration College’s Lee Kong Chian Faculty of Enterprise.
The working paper, titled “Settlement Manipulation in Prediction Markets,” examined roughly 16,000 five-minute bitcoin up-or-down contracts from their Feb. 12, 2026 launch by way of April. The contracts settle in opposition to a Chainlink oracle that aggregates spot costs from main exchanges, which means whoever can nudge the spot value within the closing moments can determine which aspect of the wager pays out.
Describing the earnings, the authors wrote that manipulators “take $8.2 million within the pushed cycles whereas breaking even in the remaining.”
The mechanics are easy, i.e. a dealer buys the “up” aspect of a five-minute contract, then fires aggressive purchase orders into the Binance spot market (the world’s largest crypto change by quantity) seconds earlier than the betting window closes. As a result of the Binance mid-price sits, within the researchers’ phrases, “about two and a half foundation factors from the oracle” decision value, even a small push can flip the settlement consequence.
A Recurring Sample within the Ultimate 10 Seconds
The fingerprints present up within the order books as a result of after the five-minute contracts launched, web order circulate on Binance within the closing ten seconds earlier than every shut jumped roughly 50% above pre-launch ranges. The bursts had been concentrated and directional, arriving exactly because the betting home windows expired.
The habits was uncommon however profitable and solely 821 merchants out of roughly 243,000 (or about one in 300) exhibited clear manipulation patterns. The prices, in the meantime, weren’t evenly shared, with 93% of the losses falling on retail individuals, who successfully served as liquidity suppliers on the shedding aspect of pushed settlements.
A Longer Clock because the Repair
The researchers noticed that the manipulation signature is “a lot attenuated” in Polymarket’s 15-minute bitcoin contracts, suggesting {that a} longer settlement horizon makes the commerce too costly to push reliably. Their main coverage suggestion is just to elongate the contract horizon.
The findings land at a fragile second for the prediction market business, particularly since crypto-native value betting has develop into one in every of its fastest-growing segments, with merchants stacking greater than $100 million on bitcoin value outcomes throughout Polymarket, Kalshi and Myriad in current months.
Polymarket, the biggest platform by quantity, is in the meantime making ready a token airdrop deliberate for the fourth quarter of 2026, a launch that might put a fair brighter highlight on the integrity of its settlement design.
Neither Polymarket nor Chainlink has publicly responded to the paper’s findings, and the authors stopped in need of alleging any rule-breaking by the platform itself. Whether or not the platform adjusts that design is now an open query.
