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[TECHNOLOGY] · United Kingdom, United States · 19 sources

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Part of situation: Polymarket regulatory and security challenges (2 clusters)

Polymarket halts trading following third-party security breach

Polymarket cryptocurrency hack third-party breach prediction market DebugBear

Polymarket, the largest cryptocurrency prediction market, temporarily suspended trading on its international platform on October 29, 2026, following a security breach involving a third-party provider. The incident, which occurred around 18:05 UTC, forced the exchange into a cancel-only mode and led to the suspension of relayer actions to prevent further unauthorized transactions.

Reports indicate the breach originated from a compromised third-party service, with some sources identifying the UK-based web performance monitoring firm DebugBear as the affected vendor. The attack appears to have involved a malicious JavaScript injection into the platform's frontend rather than an exploit of its core smart contracts. This allowed attackers to intercept user interactions and drain assets.

Blockchain analytics firms, including Arkham and Bubblemaps, have traced approximately $2.65 million to $2.7 million in stolen funds, much of which was converted into the Polygon native token, POL. Reports suggest hundreds of user wallets were affected. Polymarket has stated that it has resolved the issue, referred the matter to law enforcement in the United Kingdom, and pledged to fully reimburse all impacted traders.

Entities

Arkham · Bubblemaps · Car · Conor Grogan · DebugBear · Polygon · Polymarket · StarPlatinum

Claims

What the coverage asserts, and how many sources carry each claim.

Sources

Polymarket frena su mercado internacional tras el hackeo de un proveedor externo [bilbaohiria.com]
Polymarket Halts Trading After Third-Party Provider Breach Drains User Wallets | CryptoCompass [cryptocompass.com]
Polymarket Faces $2.68M Theft Allegations Following Security Breach [www.tronweekly.com]
Two Hacks in One Night: Are the Polymarket and Binance Breaches Connected? [btcwires.com]
Polymarket restricts trading as users report drained wallets [crypto.news]
Hackeo de Polymarket: pausa del trading y 2,65 M$ en POL [www.criptotendencias.com]
Polymarket stoppt Handel nach Sicherheitsverstoß bei Drittanbieter [www.it-boltwise.de]
Polymarket paused international trading after a security issue involving a third-party provider [mymotherlode.com]
Polymarket restores trading, pledges refunds after $2.7M breach estimate [ambcrypto.com]
Polymarket restricts trading to cancel-only mode amid wallet drain reports [cryptobriefing.com]
Fondi rubati su Polymarket, segnalazioni di furto il 29 ottobre [cryptonomist.ch]
Polymarket Hit by Massive Hack - U.Today [u.today]
Polymarket Pauses Trading as Prediction Market Investigates Security Incident [decrypt.co]
Polymarket sofre ataque hacker e usuários reportam contas roubadas [exame.com]
Polymarket paused international trading after a security issue involving a third-party provider [www.newsday.com]
Polymarket Restores Trading and Promises Reimbursement After Third-Party Security Breach [www.pymnts.com]
Polymarket Reported ’Major Outage,’ Suspended Trading [cointelegraph.com]
Polymarket Trading Halted: $2.5M Drained via Malicious Script Injection [dev.to]
Polymarket Temporarily Froze Trading After Hackers Reportedly Stole Millions Via Third-Party Service [gizmodo.com]