Polymarket Suspends Trading After Reports of User Funds Drained

Polymarket temporarily suspended trading on its international platform on Oct. 29 after reports that users’ accounts had been drained and positions closed without authorization, in a security incident later linked to a compromised third-party provider. The disruption lasted about an hour, with trading eventually resuming after the platform said its systems were operational. However, the extent of the reported losses, the number of affected users and the precise cause of the fund compromise remained unclear as the company launched an investigation.

Polymarket did not immediately provide a detailed public accounting of the cause or scope of the reported fund drain at the time of the initial reports. Details on the amount of funds affected, the mechanism of the reported drain, and the number of users impacted were not immediately disclosed in the early coverage ^[1][2].

Platform Background and Trading Halt

Polymarket is a crypto-based prediction market where users trade on the outcomes of events, operating on blockchain infrastructure. The platform has drawn attention from regulators and users in the digital asset sector. In September 2026, Natural News reported that Polymarket US, the federally regulated prediction market operated by QCX LLC, became the target of a stolen debit-card scheme in February involving at least $10 million in attempted illicit withdrawals and wagers ^[3].

The trading suspension on Oct. 29 was reported as a precautionary measure while the platform investigated the reported user fund issue. CryptoBriefing reported that the platform restricted trading to cancel-only mode and paused relayers after unconfirmed reports of drained wallets and a compromised frontend ^[4].

The halt affected Polymarket’s international exchange. The Wall Street Journal reported that the company confirmed user funds were compromised and briefly paused trading on its international exchange while it addressed the attack ^[5]. NBC News reported that the platform was forced to halt trading on its international platform for an hour after a vendor was compromised ^[6].

Reports of Compromised User Funds

NewsBreak, citing Cointelegraph, reported that several users claimed online that their Polymarket accounts had been drained of thousands of dollars after their positions were sold without their consent ^[7].

Cybersecurity News reported that Polymarket suffered a security incident on Oct. 29, 2026, after a compromised third-party provider exposed users of its international platform to wallet theft, and that traders reported missing funds, unexpected withdrawals, and positions being closed without permission ^[8].

The reported outage and fund compromise prompted the platform to suspend trading, according to the Cointelegraph account ^[1]. CoinGape reported that the platform halted trading and went into cancel-only mode following reports of users’ wallets being drained, and that after an investigation the platform revealed one of its third-party providers was compromised, causing the breach ^[9].

Details on the amount of funds affected, the mechanism of the reported drain, and the number of users impacted were not immediately disclosed.

Official Response and Industry Context

Polymarket said all its systems were operational and that trading had resumed, but that it would investigate the incident through one of its third-party providers, according to Cointelegraph ^[1]. The company did not immediately issue a detailed public statement on the cause or scope of the reported fund drain, leaving key questions unanswered in the initial coverage ^[1][2].

The incident follows other security and operational issues in decentralized finance platforms, where user funds have been targeted in past exploits. NewsBreak, citing Cointelegraph, reported that in June, Polymarket reported that hackers were able to drain more than $2.9 million in user funds by compromising a third-party vendor ^[7]. Natural News reported in September 2026 that Polymarket US faced an alleged $10 million stolen debit-card fraud scheme, and that the CFTC was said to be investigating ^[3].

Industry observers said the suspension highlights operational risks for crypto trading platforms, while noting that the reported facts remained under review. The reliance on third-party providers has been identified as a point of vulnerability. CoinDesk reported that the breach occurred through a third-party provider ^[2], and CryptoBriefing reported that the platform paused relayers after reports of a compromised frontend ^[4].

Status and Next Steps

Trading was initially suspended and later resumed after the platform reported all systems operational by 7:05 p.m. UTC, Oct. 29, according to Cointelegraph ^[1]. The platform said it would investigate the incident through one of its third-party providers ^[1]. No timeline was provided for the completion of the investigation.

Users were advised to monitor official platform channels for updates. Quartz reported that the prediction market said affected users will be made whole ^[10].

The platform had not confirmed whether the reported fund drain was the result of an external exploit, internal issue, or other cause at the time of the initial reports. The investigation was continuing.

References

1. Polymarket suspended trading amid reports of user funds being drained. https://cointelegraph.com/news/polymarket-suspends-trading-user-funds-compromised
2. Polymarket suspends trading after third-party breach leads to user losses. https://www.coindesk.com/markets/2026/10/29/polymarket-suspends-trading-after-third-party-breach-leads-to-user-losses
3. Polymarket Faces Alleged $10M Stolen Card Fraud; CFTC Said to Investigate – NaturalNews.com, September 21, 2026.
4. Polymarket restricts trading to cancel-only mode amid wallet drain reports. https://cryptobriefing.com/polymarket-cancel-only-mode-wallet-drain/
5. Hackers Swipe Millions From Polymarket Users in Latest Security Breach. https://www.wsj.com/business/polymarket-pauses-trading-after-some-users-report-funds-drained-b014527d
6. Polymarket trading halted after vendor compromise. https://www.nbcnews.com/business/consumer/polymarket-trading-halt-hack-wallets-rcna606405
7. Polymarket suspended trading amid reports of user funds being drained. https://www.newsbreak.com/cointelegraph-349491147/4974855772983-polymarket-suspended-trading-amid-reports-of-user-funds-being-drained
8. Polymarket Hacked – Users Reported Funds Stolen From Their Wallets. https://cybersecuritynews.com/polymarket-hacked/
9. Polymarket Halts Trading Amid Reports Of Users’ Wallets Being Drained. https://coingape.com/polymarket-halts-trading-amid-reports-of-users-wallets-being-drained/
10. Polymarket halted trading after vendor security breach drained funds. https://qz.com/polymarket-trading-halt-vendor-breach-user-funds-102926

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