South Korean authorities have ordered domestic access blocked to 27 unregistered cryptocurrency exchange websites, including KuCoin, BitMart and MEXC. The decision extends an earlier campaign against mobile apps and turns a registration dispute into an immediate access problem for customers.
The Financial Intelligence Unit said the communications regulator reviewed the sites on October 6 and 7 and approved blocking or service termination. South Korea requires virtual asset businesses serving residents to register with the FIU and satisfy information-security and anti-money-laundering standards. The rules also apply to foreign operators that target Korean customers.
Why the website block matters
Removing an app from a store can slow new sign-ups, but existing users may still reach an exchange through a browser. Blocking websites closes that route and increases the chance that customers must use support channels or alternative connections to manage positions and withdrawals.
The government warned that recovery can be difficult when an unregistered operator fails or refuses to return assets. That warning matters more than the list of brand names. A platform can remain operational globally while Korean users lose a reliable domestic route to their accounts.
The FIU said it plans to request website blocking as soon as it detects illegal business activity, even before users report losses. That approach signals faster enforcement and less time between identification and restricted access.
What customers and platforms face next
Residents using an affected service need to verify whether the operator is registered and whether withdrawals remain available. Moving assets should be done through ordinary account procedures and verified destinations, without relying on unsolicited messages or unofficial support.
For exchanges, the development raises the cost of serving South Korea without local compliance. Registration demands security controls, customer checks and reporting systems that can narrow product availability. Operators that do not adapt risk losing both app distribution and web access.
The action does not ban cryptocurrency trading in South Korea. It separates registered providers from platforms operating outside the local framework. The next measurable developments are whether affected exchanges seek registration, challenge the blocks or announce orderly withdrawal arrangements for Korean customers.