US Treasury Cuts Off MEXC Over $16 Billion in Alleged Illicit Flows

The US Treasury has ordered American financial institutions to stop processing funds transfers involving MEXC Global, alleging the offshore crypto exchange facilitated at least $16 billion in illicit transactions linked to Iran, Russia and North Korea. The order, issued Friday by the Financial Crimes Enforcement Network (FinCEN), is one of the toughest US actions yet against a major crypto exchange — and it is dominating crypto coverage this weekend.

What happened

On Friday, November 6, FinCEN designated Seychelles-incorporated MEXC Global as a financial institution of primary money laundering concern in connection with Russian illicit finance. The order was issued under section 9714(a) of the Combating Russian Money Laundering Act. Once it takes effect, US financial institutions will be barred from sending or receiving funds transfers involving MEXC and its affiliates, subsidiaries and branches.

The ban does not start immediately. It takes effect 30 days after the order is published in the Federal Register, a step that was still pending when FinCEN released the order. The action is part of Operation Economic Outcast, a Treasury campaign launched in August aimed at financial entities that help Iran evade sanctions.

On the same day, the Treasury also sanctioned eight Canadian money services businesses it alleges facilitated transactions with sanctioned Iranian entities.

The numbers behind the order

FinCEN says the alleged flows cover five years, from May 2021 to May 2026, and total at least $16 billion — with a detailed breakdown in the order putting likely illicit activity at about $16.7 billion. Within that total, the order attributes nearly $1.5 billion to Russian sanctions evasion, including transactions with the sanctioned Russian exchanges Garantex and its successor Grinex as recently as June 2026.

Iran is the second strand. FinCEN counts an estimated $1.87 billion in transactions with exposure to Iran, including about $1 billion in direct transactions with more than 40 Iranian crypto exchangers and about $22 million involving the Central Bank of Iran and the Islamic Revolutionary Guard Corps and its Quds Force. For North Korea, the order cites an estimated $350,000 handled for designated money launderer Sim Hyon Sop between June and September 2025. FinCEN also assesses that at least $1.99 billion linked to illicit cyber actors passed through the platform, alongside ransomware, scam and darknet-market flows.

This was not a small platform. According to Treasury figures cited in coverage, MEXC processed more than $1 billion a day and held about $5 billion in reserve assets in 2026, while DefiLlama data put its total assets at about $4.48 billion on Friday. FinCEN also notes the exchange was founded in 2018, is incorporated in the Seychelles and does not hold a virtual asset service provider licence there. MEXC's own user agreement bars customers located in Iran — a policy FinCEN says the alleged flows contradicted in practice.

Why it is blowing up

The story is spreading fast for three reasons. First, the scale: a $16 billion-plus illicit-flow allegation puts MEXC in the same conversation as the biggest US enforcement actions in crypto history. Second, the geopolitics: one order ties a single exchange to sanctions evasion for three sanctioned states at once — Russia, Iran and North Korea. Third, the timing: the order landed in a week when crypto markets were already fragile, with Bitcoin holding near $76,000 after heavy spot ETF outflows, so traders are watching whether enforcement headlines deepen the risk-off mood.

It is important to be precise about what the order does and does not do. It does not shut MEXC down worldwide and it does not seize customer funds. MEXC already does not officially serve US residents. What changes is its access to US banks and payment rails — the dollar system that even offshore exchanges rely on indirectly. As of the reports published on Saturday, MEXC had not issued a public statement on the order.

What is next

The immediate milestone is publication in the Federal Register, which starts the 30-day countdown to the ban taking effect. Markets will also watch whether other jurisdictions follow the US lead, whether MEXC responds publicly or challenges the findings, and whether volumes shift to rival offshore exchanges in the meantime. For the wider industry, the order signals US regulators will cut an exchange off entirely — not just fine it — over alleged sanctions evasion at this scale.

Sources: Reuters, Cointelegraph, The Coin Republic

FAQ

What did the US Treasury do to MEXC?

FinCEN ordered US financial institutions to stop processing funds transfers involving MEXC Global, designating it a primary money laundering concern. The ban takes effect 30 days after the order is published in the Federal Register.

How much illicit activity does the US allege?

At least $16 billion between May 2021 and May 2026, with the order's breakdown at about $16.7 billion — including roughly $1.5 billion linked to Russian sanctions evasion and $1.87 billion with exposure to Iran.

Is MEXC shut down?

No. The order cuts MEXC off from the US financial system; it does not order a worldwide shutdown or seize customer funds, and MEXC already did not officially serve US residents.

Why were Canadian firms sanctioned the same day?

The Treasury separately sanctioned eight Canadian money services businesses it alleges helped Iran evade sanctions, as part of the same wider campaign, Operation Economic Outcast.