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● LIVE Updated 1h ago · 17 sources tracked

Polymarket Halted International Trading After Hackers Drained Accounts

Polymarket has resumed international trading following a security breach that drained millions of dollars from user accounts. Malicious code injected through an unnamed third-party monitoring script executed 985 unauthorized withdrawals over approximately one hour. The platform frozen by operators to contain the threat has since brought operations back online. Company representatives stated that impacted users will be fully reimbursed for their losses. In addition to direct theft recovery, the exchange announced extra payouts to compensate traders affected by the sudden halt.

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  • ✓ Polymarket temporarily halted trading on its international platform due to a security incident involving an outside vendor.
  • ✓ Hackers drained approximately $2.73 million from 737 Polymarket accounts through 985 withdrawals in about an hour.
  • ✓ Malicious code linked to a third-party monitoring script exploited active sessions during the trading halt.
  • ✓ Polymarket announced it will pay an additional $1.2 million to about 5,500 wallets for traders hurt by the hour-long trading halt.
🛡️ Source Corroboration: 17 independent reporting domains (100% confidence) ⏱ Read time: ~2 min

What changed

Polymarket resumed international trading after addressing the third-party script compromise and announcing compensation plans for affected accounts.

Live updates

  1. Polymarket Resumes Trading After Hackers Drain Millions

    Polymarket has resumed international trading following a security breach that drained millions of dollars from user accounts. Malicious code injected through an unnamed third-party monitoring script executed 985 unauthorized withdrawals over approximately one hour. The platform frozen by operators to contain the threat has since brought operations back online. Company representatives stated that impacted users will be fully reimbursed for their losses. In addition to direct theft recovery, the exchange announced extra payouts to compensate traders affected by the sudden halt.

    Why it matters

    The security incident highlights ongoing vulnerabilities tied to third-party vendor integrations within decentralized finance and prediction markets. External scripts operating outside core infrastructure can create backdoor vectors for attackers if compromised. This breach forced an emergency response from the flagship platform to protect remaining user funds.

    What is confirmed

    • Polymarket temporarily halted trading on its international platform due to a security incident involving an outside vendor.
    • Hackers drained approximately $2.73 million from 737 Polymarket accounts through 985 withdrawals in about an hour.
    • Malicious code linked to a third-party monitoring script exploited active sessions during the trading halt.
    • Polymarket announced it will pay an additional $1.2 million to about 5,500 wallets for traders hurt by the hour-long trading halt.
    • Trading has resumed on Polymarket and the exchange stated that impacted users will be made whole.
    • The exchange is referring the matter to U.K. authorities.

    Still unconfirmed

    • The security incident occurred specifically on October 29, 2026.

    What to watch next

    • Confirmation from U.K. authorities regarding the investigation into the stolen funds
    • Verification that all impacted users have successfully received their reimbursements and extra payouts
    Sources used for this update (19)
    1. www.wired.com — WIRED - The Latest in Technology, Science, Culture and Business
    2. www.coinlive.com — Anthropic Wants Users To Stop Bullying Claude — But Who Protects The Users?
    3. www.bleepingcomputer.com — Retail giant Ahold Delhaize takes systems offline after cyberattack - BleepingComputer
    4. CNBC — Some Polymarket user funds stolen by hackers, exchange referring matter to U.K. authorities
    5. NBC News — Polymarket trading halted after vendor compromise; impacted users will be ‘made whole’
    6. Reuters — Polymarket halts trading on international platform after third-party provider compromised
    7. WIRED — Polymarket Halted International Trading After Hackers Drained Accounts
    8. The Washington Post — Polymarket pauses international trading after outside vendor’s security issue
    9. The Guardian — Polymarket temporarily suspends trading on international platform due to security incident
    10. WSJ — Hackers Swipe Millions From Polymarket Users in Latest Security Breach
    11. cybersecuritynews.com — Polymarket Hacked - Users Reported Funds Stolen From Their ...
    12. www.wired.com — Polymarket Halted International Trading After Hackers Drained ...
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