South Korea Blocks 27 Crypto Exchanges, Including BitMart and KuCoin

South Korea has blocked 27 offshore crypto exchanges, BitMart and KuCoin among them, CoinDesk reported on October 13, 2026. The regulators are no longer stopping at app stores. The blocks now reach the exchanges' websites, so a Korean user who types a familiar URL hits a wall instead of a login page. Officials say the goal is to act before investors report losses, not after. The real stakes are larger than 27 domains. One of the world's most active retail crypto markets is deciding whether its citizens may choose where they hold and trade their own money.

From App Stores to the Open Web

This did not come out of nowhere. Seoul has spent five years building a wall around its crypto market, one brick at a time.

The foundation is the amended Act on Reporting and Using Specified Financial Transaction Information, usually called the Specific Financial Information Act. It took effect in March 2021 and gave exchanges until September 24, 2021 to register with the Financial Intelligence Unit (FIU). Registration required an information security certification and, for any exchange offering won trading, a real-name bank account partnership. Dozens of smaller domestic platforms failed to qualify and shut down. Operating without registration became a criminal offense, punishable by up to five years in prison or a fine of up to 50 million won.

Foreign exchanges came next. In 2022 the FIU named a batch of offshore platforms, KuCoin among them, as illegally serving Korean users without registration. It referred them to investigators and asked for access restrictions. The practical effect was limited. Korean users kept downloading apps and opening browser tabs.

In 2025 the FIU moved to the app layer and asked Google to pull unregistered exchange apps from the Korean Play Store. That closed one door. Anyone with a desktop browser, a mobile browser, or a VPN walked through another.

The October 2026 action targets that gap. Website blocking in Korea is a well-worn tool, and the Korea Communications Standards Commission has long used it against illegal gambling and other prohibited content. Crypto exchanges now sit on a similar list. CoinDesk's report names BitMart and KuCoin. It does not name the full set of 27 in its summary, and the complete list should come from the FIU itself rather than from guesswork.

The Regulator's Case

The government's argument is simple, and it is not frivolous.

Korean investors are exposed. Retail participation in crypto runs far deeper in Korea than in most developed economies. Account counts on the five licensed won exchanges, Upbit, Bithumb, Coinone, Korbit, and Gopax, have run into the millions for years. Trading volume on Korean venues regularly rivals or beats volume on major US markets in specific altcoins.

Offshore platforms offer what domestic exchanges cannot. That means perpetual futures, high-margin derivatives, thin-cap token listings, and yield products the FSC would never approve. When those products blow up, Korean users have no domestic recourse. No Korean regulator can audit KuCoin's reserves or compel BitMart to make a user whole.

The track record supports the caution. BitMart lost roughly $196 million in a December 2021 hot wallet hack. KuCoin pleaded guilty in US federal court in January 2025 to operating an unlicensed money transmitting business. It agreed to pay close to $300 million and to leave the US market for two years. A regulator looking at those facts can fairly ask why its citizens should keep money there.

There is also the anti-money laundering angle. Korea's licensed exchanges must follow the travel rule, run know-your-customer checks tied to real-name bank accounts, and report suspicious transactions. Offshore venues serving Koreans sidestep all of it. From the FIU's view, every won that flows to an unregistered exchange is a hole in the reporting net.

The Virtual Asset User Protection Act, in force since July 19, 2024, added custody, segregation, and insurance rules for domestic exchanges. The government has spent real political capital building that framework. Letting users route around it undercuts the whole project.

The Market's Case

The counterargument starts with a question regulators rarely answer: protection from what, and at whose cost?

Korean traders do not go offshore by accident. They go because the domestic market is boxed in. Licensed won exchanges cannot offer crypto derivatives. Corporate participation was frozen for years and only began opening in 2025. Listings are cautious and slow. The result is a market that is deep in retail spot trading and shallow in almost everything else.

That structure produces the "kimchi premium," the recurring gap between Bitcoin's price on Korean exchanges and its price abroad. Capital controls under the Foreign Exchange Transactions Act make it hard to arbitrage away. The premium has swung from negligible to above 10 percent in hot markets. Every percentage point is a tax that Korean buyers pay for being Korean.

Blocking 27 offshore venues does nothing to fix that. It makes the domestic box tighter and the toll higher.

The beneficiaries are easy to spot. Upbit, operated by Dunamu, has held the dominant share of Korean won volume for years, with Bithumb a distant second. Every user who cannot reach KuCoin is a user who either stays with a domestic incumbent or leaves crypto entirely. Industry critics will call this consumer protection that looks a lot like protectionism. They have a point.

Then there is effectiveness. Website blocks in Korea depend largely on DNS and SNI filtering. A commercial VPN defeats both in under a minute. So does a mirror domain. The most determined users, the ones trading the riskiest products, are exactly the ones who will route around the block. The users who stop are the casual ones. That is backwards if the goal is to stop losses before they happen.

How Other Jurisdictions Handle It

Korea is not alone, but its approach is among the most direct.

Japan has long required offshore exchanges to register with the Financial Services Agency. It has issued repeated warnings to platforms including Bybit, MEXC, and others for serving Japanese residents. In early 2025 Apple and Google pulled several unregistered exchange apps from the Japanese stores at the FSA's request. Japan, like Korea, prefers a walled garden.

The European Union took a different route with MiCA. Instead of blocking foreign venues by domain, it offers a single passportable license. A firm authorized in one member state can serve all 27. The pressure is the same, register or leave, but the door to compliance is wider and the market behind it is larger. Several major exchanges have taken the license rather than fight.

The United States relied for years on enforcement rather than access blocks. KuCoin's 2025 plea is the clearest example. Washington did not filter KuCoin's website. It prosecuted the company until it agreed to leave.

Korea's choice to filter at the network layer puts it closer to the toolkit of states that treat the open internet as something to be managed. That is a philosophical shift, not just an administrative one, and it deserves to be named as such.

Bitcoin and the Right to Exit

Here is the position this publication takes. The state has a legitimate interest in fraud. It has no legitimate claim to decide which counterparties an adult may choose for their own savings.

The won has lost ground against the dollar for years, trading around 1,400 per dollar for much of 2025. Korean savers have watched their purchasing power erode against both the dollar and hard assets. Capital controls make it hard to move savings abroad through banks. Crypto has been one of the few practical exits. Each new layer of blocking narrows that exit and channels Korean savings back toward the domestic financial system, where the state sets the rules and the central bank sets the price of money.

Bitcoin was built for this exact situation. Notably, the block targets exchanges, not Bitcoin itself. A Korean citizen can still hold Bitcoin in a self-custody wallet, run a node, and transact peer to peer. No URL filter touches a private key. That is the lesson Korean users should take from October 13. Every custodial venue, domestic or offshore, is a permissioned gateway that a government can close. Self-custody is the only form of ownership that does not depend on a regulator's list. Exchanges are on-ramps. They were never meant to be vaults.

The irony is that blocking risky offshore casinos is the weakest form of this policy. A stronger and freer approach would open the domestic market, approve spot ETFs, let licensed exchanges compete on products, and let users who prefer self-custody alone. President Lee Jae-myung campaigned in 2025 on spot crypto ETFs and a won-denominated stablecoin. Those promises point toward opening. The website blocks point the other way.

What to Watch

The full list and the legal basis. The FIU and the KCSC should publish the names of all 27 exchanges and the statute behind each block. Expect most to be derivatives-heavy platforms with Korean-language interfaces or won-adjacent payment rails. If major global spot venues appear on the list, the policy has moved from targeting bad actors to fencing the market.

VPN and mirror traffic. Watch for a rise in Korean VPN subscriptions and new mirror domains in the coming weeks. If the blocks are routed around within a month, regulators will either escalate to payment-rail enforcement against card and bank transfers to offshore venues, or quietly accept a leaky wall. Payment enforcement is the more likely next step before mid-2027.

Domestic exchange share. Upbit and Bithumb should see a measurable bump in new accounts and volume through the fourth quarter of 2026. If Upbit's share of won volume climbs further, the protectionism critique will gain political weight, and the competition regulator, the Korea Fair Trade Commission, may face pressure to look at market concentration.

Registration attempts. At least one blocked exchange is likely to announce plans to seek a Korean license or partner with a local firm within six months. The path runs through a real-name bank account, which Korean banks have rationed tightly. Watch which banks, if any, open that door.

The derivatives question. The more pressure Seoul puts on offshore futures venues, the louder the call to permit regulated crypto derivatives at home will get. A formal FSC consultation on domestic crypto derivatives in 2027 would be the clearest sign that regulators understand the blocks alone will not hold.

Self-custody flows. The most important number may be the hardest to see. If Korean on-chain withdrawals from domestic exchanges to self-custody wallets rise after the blocks, users will have drawn the right conclusion. Governments can filter websites. They cannot filter math.

Go deeper: Bitcoin ETFs Explained · Seed Phrases Explained

Source: CoinDesk