Polymarket temporarily halted trading on its international platform on October 29, 2026, after users reported unauthorized withdrawals. The attack ran through an external service provider that gave the attackers a way into accounts. The platform's trading contracts themselves were not affected. The company reopened trading the same day and promised full reimbursement to everyone affected.
For users in Germany, the incident shifts the question. The key issue is not whether a trading contract on the blockchain has been cleanly programmed. What matters more is how many outside services run on a trading site and what happens if one of them is taken over.
What happened at Polymarket: a compromised provider, not a code bug
Polymarket is a prediction market, a trading platform on which users buy and sell shares in the outcome of future events, with prices reflecting the estimated probability. Settlement runs through smart contracts, programs on a blockchain that execute stakes and payouts without an administering body.
According to the company, those programs were not the problem. Instead, attackers gained access to a provider whose code the platform had embedded in its website. Whoever controls such ...
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