South Korea Opens First Criminal Probe Into Polymarket Users

South Korean police have opened the country’s first criminal investigation targeting local users of Polymarket. The world’s largest blockchain-based prediction market platform. According to local media outlet ChosunBiz, the probe is being led by the Gangwon Provincial Police Agency following a request from South Korea’s National Police Agency. 

South Korean police launch first illegal gambling probe into local users of Polymarket, the world’s largest prediction market

According to ChosunBiz, South Korean police are investigating local Polymarket users on suspicion of illegal gambling, reportedly the first such case… pic.twitter.com/wZOP2WBdqs

— Wu Blockchain (@WuBlockchain) June 5, 2026

Investigators are focusing on South Korean residents who allegedly used Polymarket to bet on various events. It includes the country’s June 3 local elections. What makes this case stand out is that authorities are going after individual users rather than the platform itself. It’s a significant escalation in regulatory pressure and already one of the biggest Polymarket news stories to come out of Asia this year.

Why Authorities Consider It Illegal Gambling

Under South Korean law, betting on platforms outside the state-run Sports Toto system is broadly treated as illegal gambling. Even though Polymarket operates legally in certain jurisdictions, South Korean authorities consider prediction market activity a form of private gambling. It meaning users under investigation could face penalties under Article 246 of the Criminal Act. This carries fines of up to 10 million won.

Attorney Ahn Chang-bo, who represents some of the users involved, said, “It appears that the elements constituting the crime of gambling are met. However, since there have been absolutely no domestic cases of punishment for using polymarkets, it is difficult to predict the level of punishment.” That ambiguity has left many local crypto users feeling understandably uneasy.

Election Markets Drew Massive Betting Activity

Much of the investigation appears to center on activity surrounding South Korea‘s June 3 local elections. Polymarket’s election-related markets drew heavy interest from South Korean users, with betting volumes reportedly reaching tens of billions of won. Authorities noted that users accessed the platform directly, with no VPNs or IP-circumvention tools required. Polymarket also reportedly allowed Korean users to place bets using dollar-backed stablecoins without imposing meaningful restrictions. This likely made it easier for the scale of participation to grow unchecked.

Growing Regulatory Pressure on Prediction Markets

This investigation doesn’t exist in isolation. Earlier this year, South Korea’s media regulator had already taken a look at Polymarket’s operations. The move to a criminal probe signals the enforcement posture is hardening. Industry observers see this case as a potential regulatory precedent. Should authorities push forward with penalties against users? Other jurisdictions may feel emboldened to take similar action against participants in decentralized prediction markets.

How This Affects Developers and Investors

For developers, the case is a reminder that regulatory compliance can’t be an afterthought. Teams building decentralized betting platforms may face growing pressure to put jurisdiction specific restrictions and compliance controls in place. For investors, it introduces a layer of regulatory risk that’s hard to ignore. Legal uncertainty could weigh on user growth in key markets. This may also shape how the broader prediction market and forecasting sector gets evaluated going forward.

A Landmark Case for Prediction Markets

The investigation represents the first known criminal probe targeting South Korean users of Polymarket. While the final outcome remains uncertain, the case signals that regulators are paying closer attention to blockchain based prediction markets. For now, users and industry participants will be monitoring developments closely. The results could shape how prediction markets operate not only in South Korea but across other major crypto jurisdictions in the future.