Global Trading Halted on Polymarket Following Vendor Breach and Multi-Million Dollar Theft Polymarket temporarily suspended international trading after a UK vendor breach drained an estimated $2.7 million from roughly 700 accounts. The platform has committed to reimbursing affected traders. Prediction market operator Polymarket temporarily suspended trading across its international platform following a significant cyber intrusion. The suspension lasted several hours while internal teams conducted an investigation. The vulnerability originated not within the core prediction website itself, but at an external third-party vendor located in the United Kingdom. Law enforcement authorities in the UK have been formally notified about the incident. Hundreds of Accounts Drained as Platform Pledges Refunds Shortly after the incident unfolded, several prominent traders took to X to voice distress over balances disappearing from their portfolios. Blockchain analytics firm Bubblemaps identified approximately 700 user accounts that appeared compromised, tracking total losses to roughly $2.7 million. While company representatives declined to specify the exact count of victimized accounts or the comprehensive financial toll, the platform confirmed it will issue complete refunds to all impacted traders. Regulated US Arm Unaffected by International Incident The breach did not compromise accounts on Polymarket US, the firm's domestic offering tailored for residents of the United States. Polymarket maintains two distinct operational structures: Polymarket US functions as a federally regulated financial exchange within American borders, whereas the primary international entity relies on cryptocurrency architecture and remains barred from operating in the United States alongside several other jurisdictions. Prior Security Lapses and Repeated Scrutiny Security vulnerabilities are not unprecedented for participants on the platform. Earlier in June 2026, another security breach hit Polymarket, inflicting losses exceeding $2 million on active traders. Since launching in 2020, the enterprise has frequently found itself entangled in regulatory and ethical controversies. Insider Trading Allegations and a $21 Billion Valuation In recent years, the platform stood at the center of high-profile insider trading investigations that led to multiple arrests. One proceeding involved a Special Forces soldier accused of placing wagers regarding the capture of Venezuela's former leader. A separate inquiry centered on a Google employee alleged to have converted non-public corporate data into millions in speculative profits. Suspects in both proceedings have entered pleas of not guilty. Despite persistent scrutiny, Polymarket secured $1 billion in an August 2026 funding round spearheaded by 1789 Capital, an investment firm where Donald Trump Jr. serves as a partner, pushing the company's valuation to $21 billion. What this means for you This vendor-side security breach underscores the immediate counterparty risks facing traders on decentralized and offshore prediction venues. • Impact on international traders: Global users storing capital on offshore prediction venues face ongoing exposure to vendor-level vulnerabilities. Approximately 700 accounts lost around $2.7 million in this incident, though the platform has pledged full reimbursement. • Status of US accounts: Users operating within the federally regulated Polymarket US venue remained completely unaffected. The separation of technical infrastructure shielded American accounts from the external vendor compromise. • Restitution timeline: Impacted account holders are slated to receive financial refunds directly from the platform. Users should verify account histories and monitor official communications regarding claims processing. • Vendor security awareness: Even when a primary exchange maintains robust firewalls, subsidiary software providers can compromise trader balances. Investors should limit exchange balances to active trading needs and withdraw excess liquidity. Why this happened The incident was triggered by a security compromise at an external contractor rather than a direct vulnerability in the primary trading engine. • Breach of UK-based vendor: Intruders compromised an external third-party software provider operating out of the United Kingdom. Although Polymarket's primary web domain remained intact, the vendor link exposed individual account balances. • Recurrent security vulnerabilities: Security challenges have previously surfaced on the platform under similar operational pressures. In June 2026, an earlier breach caused over $2 million in financial losses for active traders. • Law enforcement involvement: The exchange immediately suspended trading operations and escalated the matter to British law enforcement authorities. Inquiries remain ongoing to trace how unauthorized access was established through vendor protocols. Questions & Answers 1. Why was international trading halted on Polymarket? Trading was suspended for several hours after a UK-based third-party vendor suffered a breach that compromised user accounts. 2. How much money was stolen during the breach? Blockchain analytics firm Bubblemaps estimated that roughly 700 users lost approximately $2.7 million. 3. Will victims of the hack receive reimbursement? Yes, Polymarket confirmed that it will issue full refunds to all impacted traders. 4. Was Polymarket US affected by the breach? No, the breach did not impact Polymarket US, which operates separately as a federally regulated domestic exchange. 5. Has Polymarket experienced previous cyber attacks? Yes, a previous breach in June 2026 resulted in more than $2 million in losses for affected platform users. 6. What is Polymarket's current corporate valuation? Following a $1 billion funding round in August 2026 led by 1789 Capital, the company is valued at $21 billion. https://trendkia.com/en/business/polymarket-para-saibara-hamala-haikarsa-ne-khali-kie-khate-antararashtriya-tredinga-ruki-53358 TrendKia — Har trend, sabse pehle.