{"id":75494,"date":"2026-07-16T12:16:54","date_gmt":"2026-07-16T12:16:54","guid":{"rendered":"https:\/\/crowdfundjunction.com\/blog\/polymarkets-bitcoin-bets-were-rigged-in-the-final-10-seconds\/"},"modified":"2026-07-16T12:16:54","modified_gmt":"2026-07-16T12:16:54","slug":"polymarkets-bitcoin-bets-were-rigged-in-the-final-10-seconds","status":"publish","type":"post","link":"https:\/\/crowdfundjunction.com\/blog\/polymarkets-bitcoin-bets-were-rigged-in-the-final-10-seconds\/","title":{"rendered":"Polymarket&#8217;s Bitcoin Bets Were Rigged in the Final 10 Seconds"},"content":{"rendered":"<p><b>(Originally posted on : Bitcoin News )<\/b><br \/>\n<\/p>\n<div>\n<div class=\"@container mb-[25px] rounded-sm overflow-clip py-0.5 pr-0.5 pl-2.5 bg-success-100\">\n<div class=\"flex flex-col gap-m overflow-clip rounded-[6px] !bg-success-10 p-3 @[420px]:p-m\">\n<h2 class=\"m-0 flex items-center gap-s text-[19px] !text-[#1c1c1c] md:text-[20px]\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"10\" viewbox=\"0 0 16 10\" fill=\"none\" class=\"shrink-0 text-success-100\" aria-hidden=\"true\"><path d=\"M1 1.5h14\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\"\/><path d=\"M1 8.5h10\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\"\/><\/svg><span>Key Takeaways<\/span><\/h2>\n<ul class=\"m-0 flex list-none flex-col gap-m pl-0\">\n<li class=\"m-0 flex items-start gap-s !text-[#434248]\"><span class=\"mt-2 size-2 shrink-0 rounded-full bg-success-100\" aria-hidden=\"true\"\/><span class=\"text-body\">Stanford and SMU researchers found 821 traders took $8.2 million from Polymarket\u2019s 5-minute bitcoin bets.<\/span><\/li>\n<li class=\"m-0 flex items-start gap-s !text-[#434248]\"><span class=\"mt-2 size-2 shrink-0 rounded-full bg-success-100\" aria-hidden=\"true\"\/><span class=\"text-body\">Net order flow on Binance jumped about 50% in the final 10 seconds before settlement, the study found.<\/span><\/li>\n<li class=\"m-0 flex items-start gap-s !text-[#434248]\"><span class=\"mt-2 size-2 shrink-0 rounded-full bg-success-100\" aria-hidden=\"true\"\/><span class=\"text-body\">The paper says 15-minute contracts show far less abuse, pointing to longer settlement windows as the fix.<\/span><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<h2>Striking New Findings Emerge<\/h2>\n<p>Polymarket\u2019s fastest <span>bitcoin<\/span> betting product shows systematic signs of settlement manipulation, according to a <a href=\"https:\/\/arxiv.org\/html\/2606.31675v1\" target=\"_blank\" rel=\"noopener noreferrer\">new study<\/a> by David Dai and Ruizhe Jia of Stanford University\u2019s Department of Management Science and Engineering and Shihao Yu of Singapore Management University\u2019s Lee Kong Chian School of Business.<\/p>\n<figure id=\"attachment_831472\" aria-describedby=\"caption-attachment-831472\" style=\"width:843px\" class=\"wp-caption aligncenter\"><figcaption id=\"caption-attachment-831472\" class=\"wp-caption-text\">Image source: arxiv.org<\/figcaption><\/figure>\n<p>The working paper, titled \u201cSettlement Manipulation in Prediction Markets,\u201d examined roughly 16,000 five-minute <span>bitcoin<\/span> up-or-down contracts from their Feb. 12, 2026 launch through April. The contracts settle against a Chainlink <span>oracle<\/span> that aggregates spot prices from major exchanges, meaning whoever can nudge the spot price in the final moments can decide which side of the bet pays out.<\/p>\n<p>Describing the profits, the authors wrote that manipulators \u201ctake $8.2 million in the pushed cycles while breaking even in the rest.\u201d<\/p>\n<p>The mechanics are straightforward, i.e. a trader buys the \u201cup\u201d side of a five-minute contract, then fires aggressive buy orders into the Binance spot market (the world\u2019s largest <span>crypto<\/span> exchange by <span>volume<\/span>) seconds before the betting window closes. Because the Binance mid-price sits, in the researchers\u2019 words, \u201cabout two and a half basis points from the <span>oracle<\/span>\u201d resolution price, even a small push can flip the settlement outcome.<\/p>\n<h2>A Recurring Pattern in the Final 10 Seconds<\/h2>\n<p>The fingerprints show up in the order books because after the five-minute contracts launched, net order flow on Binance in the final ten seconds before each close jumped roughly 50% above pre-launch levels. The bursts were concentrated and directional, arriving precisely as the betting windows expired.<\/p>\n<p>The behavior was rare but lucrative and only 821 traders out of roughly 243,000 (or about one in 300) exhibited clear manipulation patterns. The costs, meanwhile, were not evenly shared, with 93% of the losses falling on retail participants, who effectively served as <span>liquidity<\/span> providers on the losing side of pushed settlements.<\/p>\n<h2>A Longer Clock as the Fix<\/h2>\n<p>The researchers observed that the manipulation signature is \u201cmuch attenuated\u201d in Polymarket\u2019s 15-minute <a href=\"https:\/\/www.binance.com\/en\/price\/bitcoin\" class=\"lar_link lar_link_outgoing\" target=\"_blank\" rel=\"noopener noreferrer\">bitcoin<\/a> contracts, suggesting that a longer settlement horizon makes the trade too expensive to push reliably. Their primary policy recommendation is simply to lengthen the contract horizon.<\/p>\n<p>The findings land at a delicate moment for the <a href=\"http:\/\/www.bitcoin.com\/get-started\/what-are-prediction-markets\/\" class=\"lar_link lar_link_outgoing\" target=\"_blank\" rel=\"noopener noreferrer\">prediction market<\/a> industry, especially since crypto-native price betting has become one of its fastest-growing segments, with traders stacking <a href=\"https:\/\/news.bitcoin.com\/bitcoin-prediction-markets-show-84k-ceiling-as-traders-stack-bets-on-polymarket-kalshi-and-myriad\/\">more than $100 million<\/a> on <a href=\"https:\/\/www.binance.com\/en\/price\/bitcoin\" class=\"lar_link lar_link_outgoing\" target=\"_blank\" rel=\"noopener noreferrer\">bitcoin<\/a> price outcomes across Polymarket, Kalshi and Myriad in recent months.<\/p>\n<p>Polymarket, the largest platform by <a href=\"http:\/\/www.bitcoin.com\/get-started\/what-is-trading-volume\/\" class=\"lar_link lar_link_outgoing\" target=\"_blank\" rel=\"noopener noreferrer\">volume<\/a>, is meanwhile preparing a <a href=\"https:\/\/news.bitcoin.com\/prediction-market-giant-polymarket-gears-up-for-token-airdrop-and-vc-windfall\/\">token airdrop<\/a> planned for the fourth quarter of 2026, a launch that would put an even brighter spotlight on the integrity of its settlement design.<\/p>\n<p>Neither Polymarket nor Chainlink has publicly responded to the paper\u2019s findings, and the authors stopped short of alleging any rule-breaking by the platform itself. Whether the platform adjusts that design is now an open question.<\/p>\n<\/p><\/div>\n<p><a href=\"https:\/\/news.bitcoin.com\/stanford-study-polymarket-bitcoin-manipulation\/\">Source link <\/a><br \/>\n<br \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>(Originally posted on : Bitcoin News ) Key Takeaways Stanford and SMU researchers found 821 traders took $8.2 million from Polymarket\u2019s 5-minute bitcoin bets. Net order flow on Binance jumped about 50% in the final 10 seconds before settlement, the study found. The paper says 15-minute contracts show far less abuse, pointing to longer settlement [&hellip;]<\/p>\n","protected":false},"author":3947362404,"featured_media":75495,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[32],"tags":[],"_links":{"self":[{"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/posts\/75494"}],"collection":[{"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/users\/3947362404"}],"replies":[{"embeddable":true,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/comments?post=75494"}],"version-history":[{"count":0,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/posts\/75494\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/media\/75495"}],"wp:attachment":[{"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/media?parent=75494"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/categories?post=75494"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/tags?post=75494"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}