FinCEN orders U.S. firms to block MEXC fund transfers

On November 6, the U.S. Treasury’s Financial Crimes Enforcement Network (FinCEN) ordered U.S. financial institutions to block fund transfers involving MEXC Global, citing at least $16 billion in illicit transactions. The order would reach transfers in both fiat currency and crypto, putting a U.S. financial-system restriction on one of the world’s largest crypto exchanges.

FinCEN announced the action as part of Operation Economic Outcast, but its legal finding rests on alleged Russian illicit finance. The agency classified MEXC as a foreign financial institution of primary money laundering concern in connection with Russian illicit finance under Section 9714 of the Combating Russian Money Laundering Act. In its announcement, FinCEN said MEXC facilitated at least $16 billion in transactions linked to Iranian, North Korean and Russian sanctions evasion and cybercrime.

What transfers does the order prohibit?

It prohibits covered financial institutions from sending or receiving funds to or from MEXC Global. The FinCEN order published for the Federal Register defines funds to include convertible virtual currency, so the restriction covers crypto transfers as well as other forms of payment.

The order’s definition of MEXC includes its foreign subsidiaries, branches and offices, along with successor entities. It expressly excludes any MEXC affiliates, subsidiaries, branches or offices located in the United States. The restriction applies to covered financial institutions under existing regulations; the order does not describe a direct ban on individuals holding or trading crypto through MEXC.

FinCEN said the order takes effect 30 days after publication in the Federal Register and has no stated end date. That means the announcement does not itself mark the start of the transfer prohibition. Once effective, violations may carry civil or criminal penalties, according to Treasury.

Why does FinCEN cite Russian illicit finance?

Section 9714 supplies the authority for the action, and FinCEN’s formal finding concerns Russian illicit finance, even as Treasury presents the move within a campaign targeting Iran’s financial networks. The distinction matters because the order’s stated legal basis is narrower than the operation’s public framing.

FinCEN’s order says that from May 2021 onward MEXC facilitated at least $16.7 billion in likely illicit activity. It separately identifies more than $1.87 billion in transactions with exposure to Iran, including over $1 billion in direct transfers involving Iranian crypto exchanges. The agency also cited activity benefiting North Korean actors and cybercriminals. These are government findings and allegations, not a court judgment.

On the Russian side, FinCEN cited nearly $1.5 billion in transactions linked to sanctions evasion between May 2021 and May 2026, including direct transactions with sanctioned entities. It said MEXC continued processing transactions involving Garantex and its successor, Grinex, as recently as June 2026. The agency’s rationale is that restricting transfers would impede these flows and reduce the risk to U.S. institutions.

How does the restriction work for crypto transfers?

The order requires financial institutions to prevent covered transfers involving MEXC, but it recognizes that crypto systems can make it difficult to stop incoming transfers before receipt. FinCEN says institutions may need to reject certain crypto transfers received from MEXC and allows flexibility where funds arrive from addresses outside their control, such as after passing through an unhosted wallet.

That implementation detail limits what the measure can guarantee on-chain: it places obligations on covered institutions, while acknowledging that they may receive crypto linked to MEXC despite efforts to avoid it. FinCEN says the order does not replace existing Bank Secrecy Act duties, including suspicious-activity reporting, or obligations under sanctions administered by the Office of Foreign Assets Control.

Sources and documents

• announcement, FinCEN said MEXC facilitated at least $16 billion in transactions linked to Iranian, North Korean and Russian sanctions evasion and cybercrime — fincen.gov
• FinCEN order published for the Federal Register — public-inspection.federalregister.gov