Polymarket Halts International Trading After Third-Party Vendor Compromise Drains Approximately $2.65 Million From User Wallets
What happened
Polymarket halted trading on its international exchange for nearly 60 minutes after a compromised UK vendor enabled unauthorized withdrawals from user accounts.
The Context
* Third-party software compromised: The breach originated outside Polymarket's primary infrastructure, prompting the exchange to trigger cancel-only mode and freeze relayers around 3 p.m. ET. * Separation protected US users: The incident targeted only the global platform; the regulated domestic US product remained entirely insulated and operational throughout. * Capital backstop confirmed: Executive leadership referred the breach to UK law enforcement and pledged full capital reimbursements for all affected client balances.
The Number
— the total cryptocurrency drained during the breach per Arkham Intelligence data, highlighting how a single external vendor dependency can jeopardize platform liquidity in minutes.
Takeaway
Expect digital asset venues to mandate stricter third-party access controls and accelerate on-chain circuit breakers to prevent future vendor-driven liquidity drains.
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