Treasury Cuts MEXC Off From US Financial System Over $16 Billion in Illicit Flows

The U.S. Treasury has ordered crypto exchange MEXC Global cut off from the American financial system, accusing the platform of facilitating at least $16 billion in illicit transactions tied to Iran, North Korea and Russia. The order, issued Friday through the Financial Crimes Enforcement Network (FinCEN), takes effect 30 days after publication in the Federal Register and bars U.S. financial institutions from processing any funds transfers to or from the exchange.

FinCEN named MEXC — one of the world's 20 largest crypto exchanges — a "primary money laundering concern" in connection with Russian illicit finance. The designation is the latest move in what Treasury calls Operation Economic Outcast, a broader campaign against sanctions-evasion networks that has already reached Russia's A7 Network and Iran's Nobitex.

"Financial institutions cannot have it both ways: Either you support the Iranian regime, or you have access to the U.S. financial system," Treasury Secretary Scott Bessent said in a statement, vowing to keep severing the regime's "economic lifelines" and its attempts to use digital assets to dodge sanctions.

What does the order allege?

Founded in 2018, MEXC processes more than $1 billion in daily transactions, holds roughly $5 billion in reserves and lists more than 3,000 tokens, according to FinCEN. Between May 2021 and May 2026, the agency said, the platform moved at least $16 billion connected to illicit activity, including:

• Nearly $1.5 billion tied to Russian sanctions evasion;
• $232 million in direct transactions with sanctioned entities;
• Roughly $200 million linked to the A7A5 ruble-backed stablecoin;
• About $22 million benefiting Iran's central bank and its Islamic Revolutionary Guard Corps.

Despite publicly claiming anti-money-laundering controls and barring users in Iran, North Korea and other restricted jurisdictions, MEXC's compliance was riddled with "severe deficiencies," FinCEN said. The exchange was still transacting with sanctioned Russian exchange Garantex and its successor Grinex as recently as June 2026 — more than four years after Garantex was first designated.

How does this fit the wider crackdown?

Those connections place MEXC inside a sprawling sanctions-evasion ecosystem that Treasury has been dismantling piece by piece. Last month, the department designated Russia's A7 Network a transnational criminal organization and proposed cutting its front companies off from U.S. finance, flagging more than $179 billion in transactions through its A7A5 token, much of it routed through Garantex and Grinex.

The same campaign has reached Iran's crypto sector. Treasury gained sweeping authority to sanction anyone operating in it and blacklisted the Iranian exchange Nobitex over its role in funneling crypto to the IRGC.

Why FinCEN used this particular tool?

The order draws on a provision of the Combating Russian Money Laundering Act rather than a standard sanctions designation. It's a tool FinCEN has increasingly reached for to cut off crypto infrastructure that operates outside the correspondent banking system — meaning offshore exchanges with no direct U.S. banking relationships can still be isolated by threatening any U.S. institution that touches their flows.

For MEXC, the operational consequences are severe: any dollar-denominated on-ramp or off-ramp through a U.S. bank becomes legally radioactive once the order takes effect. For the broader market, the message is that scale and a top-20 ranking offer no shield when an exchange's counterparty network includes designated entities.

The countdown clock is now running — U.S. financial institutions have roughly 30 days from Federal Register publication to unwind any transfer exposure to MEXC.