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Polymarket Trading Halted After $2.7 Million Hack

Polymarket Trading Halted After $2.7 Million Hack

First seen 29 Oct 2026, 19:44 UTC • •
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ThreatCluster AI
ThreatCluster •October 29, 2026 at 20:45 UTC
  • •Polymarket's international trading platform halted due to a $2.7 million hack.
  • •Unauthorized withdrawals affected around 700 users, linked to a compromised third-party vendor.
  • •Polymarket will refund impacted users and has notified law enforcement.

Polymarket paused trading on its international platform after hackers drained approximately $2.7 million from user accounts. The breach was linked to a compromised third-party vendor based in the UK, not the Polymarket website itself. Affected users reported unauthorized withdrawals, with around 700 traders impacted. The platform's trading API experienced a major outage, leading to a cancel-only mode for existing orders. Polymarket has stated that it will refund those affected and has referred the incident to law enforcement. This incident follows a previous breach in June 2026 that resulted in over $2 million in losses. The company has faced scrutiny over security issues since its launch in 2020.

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Timeline

2026-10-29
Polymarket trading paused
Trading was halted after reports of unauthorized withdrawals from user accounts, totaling approximately $2.7 million.
Wired
2026-10-29
Polymarket confirms vendor breach
Polymarket stated that a third-party vendor was compromised, leading to the security incident.
Decrypt.Co

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Common questions

How many users were affected?
Approximately 700 users reported unauthorized withdrawals totaling around $2.7 million.
Will affected users be compensated?
Yes, Polymarket has stated that it will refund all impacted users.
Is this incident linked to previous breaches?
Yes, this follows a previous breach in June 2026 that resulted in over $2 million in losses.