Polymarket Halts International Trading ~1 Hour After Third-Party Hack; Users Reimbursed

4.2 · 1d ago · US · FINANCE

The Facts

  • Polymarket halted trading on its international platform on Thursday after a compromise of a third-party provider. ✓2 · CNBC, NBC News
  • Trading resumed at 3:00 p.m. ET after the platform was offline for nearly an hour. ✓2 · CNBC, NBC News
  • Polymarket said it fixed the issue on its end and will make whole all affected wallets/traders. ✓2 · CNBC, NBC News
  • Polymarket referred the matter to U.K. law enforcement; NBC News reports the company said the attack appeared to originate from the U.K., and CNBC reports the U.K. is the third-party provider's country of operation. ✓2 · CNBC, NBC News
  • Polymarket's U.S. exchange was not affected and operated as normal. ✓2 · CNBC, NBC News
Dive deeper · 6 more factsShow less
  • Traders reported unauthorized withdrawals or drained wallets on social media and Discord; Polymarket did not confirm users lost money, per NBC News. ✓2 · CNBC, NBC News
  • A person familiar with the matter said the hackers gained access via software from DebugBear, a web analytics and website performance tool; DebugBear said on X around 2 p.m. ET it was experiencing an 'ongoing security incident'. NBC News only
  • The Block, citing Arkham data, reported about $2.65 million in crypto was siphoned from users' wallets; Polymarket declined to comment on the figure. NBC News only
  • Polymarket's international exchange runs as a decentralized finance platform on the Polygon blockchain and is not regulated in the U.S. CNBC only
  • Polymarket was valued at $21 billion in September after investors led by Donald Trump Jr. invested $1 billion, and processes about $200 million in daily trading. NBC News only
  • The outage came days before the Nov. 3 U.S. midterm elections, when volumes are expected to rise. CNBC only

Context

Polymarket suspended trading on its international platform on Thursday after what it described as the compromise of a third-party provider, following user reports of unauthorized withdrawals. Trading resumed at 3:00 p.m. ET.

The company said it would fully reimburse affected traders and has referred the incident to U.K. law enforcement. Its U.S. exchange was unaffected. The size of losses has not been confirmed by Polymarket.

Conflicting Reports

  • CNBC describes the provider as unnamed; NBC News, citing an anonymous person familiar, identifies it as DebugBear.
  • NBC News says Polymarket did not confirm users lost money, while CNBC reports 'unauthorized withdrawals' as seen by traders; the $2.65 million loss figure is from The Block via NBC News and is unconfirmed by Polymarket.

How the Agent Panel Scored This

Independent AI personas each scored importance 1–10; the story's score is a trimmed mean (highest and lowest votes dropped). Vote spread: 2.

5 News Editor A concrete hack and one-hour trading halt on a $21 billion platform with reported $2.65 million siphoned and pre-midterm timing is newsworthy, but the effects were brief, the U.S. exchange was unaffected, and losses are unconfirmed.
5 Critical Reader A one-hour halt of a major prediction market's international platform after a hack that reportedly drained about $2.65 million, with the company promising reimbursement, is a moderate, concrete event, though losses are unconfirmed and the U.S. exchange was unaffected.
4 Informed Citizen A one-hour halt and a roughly $2.65 million hack on an offshore crypto platform affecting some international users is a limited-impact event, though the platform's size and pre-midterm timing add some relevance.
4 Business Analyst A one-hour halt on an international prediction market after a third-party hack, with an alleged ~$2.65M drained and full reimbursement promised, is a limited-impact security incident, though its scale and crypto/election-season timing lift it slightly above routine news.
4 Policy Expert A one-hour halt of an international crypto prediction market after a third-party hack, with unconfirmed losses (reported ~$2.65M) and reimbursement pledged, is a notable but limited-impact incident with no enacted law, ruling, or regulatory action.
4 Science & Tech Analyst A one-hour halt of a crypto prediction market's international platform after a third-party software compromise, with reported roughly $2.65 million in drained wallets, is a limited-scope incident with notable but contained impact, though it touches a high-profile platform days before U.S. midterms.
3 Global Affairs Analyst A one-hour halt of an offshore crypto prediction market after a third-party software hack, with about $2.65 million reportedly siphoned and the U.S. exchange unaffected, is a minor, limited-impact business and cybersecurity event rather than geopolitical significance.

Sources (2)

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