The US Treasury has ordered American financial institutions to stop processing funds transfers involving cryptocurrency exchange MEXC Global, accusing the platform of facilitating approximately $16.7 billion in transactions connected to sanctions evasion, cybercrime and other illicit activity between May 2021 and May 2026.
The November 6 action, issued by the Financial Crimes Enforcement Network (FinCEN), targets MEXC’s access to the US financial system rather than ordering the exchange itself to close. The restriction covers transfers of fiat currency and cryptocurrency involving the Seychelles-based platform, including its foreign subsidiaries and successor entities.
And the ban has not taken effect yet. It becomes effective 30 days after publication in the Federal Register, which had not been confirmed as of November 7. The published order will establish the precise effective date.
MEXC responded in a statement issued late on November 6, saying it was reviewing the order with its legal and compliance teams. The exchange maintained that customer assets remained secure and that deposits, withdrawals and trading were operating normally. It also announced an independent review of its anti-money-laundering and sanctions controls and said it intended to engage with FinCEN and other regulators.
The response did not directly address the specific transaction figures cited by Treasury or explain how MEXC intends to maintain access to financial counterparties once the prohibition becomes effective.
FinCEN identifies $16.7 billion in suspected illicit transactions
FinCEN’s findings cover five years of activity and draw on public information, blockchain analysis and non-public intelligence. The agency determined that MEXC was a financial institution of primary money laundering concern in connection with Russian illicit finance.
The 24-page FinCEN enforcement order identifies several categories of transactions associated with sanctioned entities and illicit financial networks.
Between May 2021 and May 2026, MEXC allegedly sent or received nearly $1.5 billion in transactions with direct or indirect exposure to Russian sanctions evasion. Approximately $232 million involved direct transactions with entities sanctioned by the United States, European Union or United Kingdom.
Among those counterparties were Garantex and Grinex, two cryptocurrency exchanges associated with Russian sanctions evasion networks. FinCEN said MEXC was still processing transactions involving both platforms as recently as June 2026, despite Garantex having been sanctioned by the US Treasury in April 2022.
The relationship connects MEXC to a network already subject to extensive international enforcement. Japan expanded its own restrictions against Garantex in October, adding another jurisdiction to the campaign against the exchange. Dave Finances previously examined the sanctions against Garantex and its successor Grinex, including allegations that the newer platform helped maintain financial activity after the original exchange was disrupted.
FinCEN also identified at least $26 million in transactions benefiting the sanctioned A7 Network and almost $200 million connected to A7A5, a ruble-backed stablecoin associated with the network’s operators and sanctioned entities.
The figures are large, but they describe flows across several years, and some of the underlying categories may overlap. They should not be added together as seperate amounts or interpreted as customer losses.
Iran-linked transfers include sanctioned institutions
FinCEN’s investigation identified nearly $2 billion in transactions connected to Iranian actors or known or suspected terrorist organizations.
Approximately $1.87 billion involved exposure to Iran, including more than $1 billion in direct transfers between MEXC and over 40 identified Iranian cryptocurrency exchanges. Some of those exchanges were already subject to US or international sanctions.
The agency also identified approximately $22 million in transactions associated with the Central Bank of Iran, the Islamic Revolutionary Guard Corps (IRGC) and its Quds Force. Another $36 million involved transactions related to the Al-Qassam Brigades and other Iran-linked groups designated by US authorities.
These findings conflict with MEXC’s published restrictions prohibiting customers in certain jurisdictions, including Iran and North Korea, from using its services.
The direct transfers are the awkward part of the record, particularly when the exchange’s own rules prohibited some of the jurisdictions involved.
The allegations also come amid wider investigations into how Iranian financial networks access international cryptocurrency markets. An earlier investigation of the Iran-linked Shelbit network identified billions of dollars in transactions involving Iranian businesses, state-linked financial channels and international trading platforms.
That case involved a different exchange and does not establish any connection between Shelbit and MEXC. Both investigations nevertheless concern the ability of sanctioned or high-risk financial networks to move funds through cryptocurrency intermediaries.
FinCEN separately identified transactions associated with North Korean financial facilitators. According to the order, MEXC processed approximately $350,000 received by sanctioned North Korean money launderer Sim Hyon Sop between June and September 2025, more than two years after his US designation.
Cybercrime exposure formed another major part of the findings. FinCEN estimated that at least $1.99 billion associated with illicit cyber actors moved through MEXC between May 2021 and May 2026. It also identified more than $37.9 million in suspected ransomware payments received between January 2022 and July 2024, with exposure to more than 125 ransomware variants.
US financial institutions face a direct transfer prohibition
The order was issued under Section 9714(a) of the Combating Russian Money Laundering Act, which allows Treasury to impose restrictions on financial institutions operating outside the United States when they present serious money-laundering concerns connected to Russian illicit finance.
The restriction goes beyond conventional correspondent banking limitations. Covered US financial institutions will be prohibited from sending or receiving funds involving MEXC, including convertible virtual currencies.
FinCEN specifically concluded that limiting correspondent accounts would be insufficient because funds could continue moving through indirect financial relationships outside traditional banking channels.
There is a technical complication with cryptocurrency transfers. FinCEN acknowledged that institutions may be unable to reject unsolicited blockchain payments before receiving them, particularly when the sending address is outside their control.
The order’s operative provisions nevertheless establish a prohibition on transfers to or from MEXC. Institutions must continue meeting their exisiting Bank Secrecy Act obligations, including suspicious activity reporting, alongside applicable sanctions requirements.
Willful violations can expose covered institutions and responsible personnel to civil or criminal penalties. FinCEN also retains authority to impose conditions on particular transactions or grant appropriate exemptions.
The measure has no specified expiration date. It covers MEXC’s foreign branches, subsidiaries and successor entities, including businesses that acquire its assets or continue its operations under a new name.
It is not quite the same thing as a direct order to shut down an exchange. FinCEN has not ordered MEXC to suspend all trading, freeze customer balances or liquidate its operations, and the action is distinct from an OFAC asset-blocking designation.
MEXC faces another constraint on international market access
The US action adds to an already difficult regulatory position for MEXC in several jurisdictions.
FinCEN cited earlier regulatory intervention in Seychelles, Hong Kong and Japan. Seychelles’ Financial Services Authority took action against MX Global Ltd in May 2026 over unlicensed virtual-asset services, while Hong Kong’s Securities and Futures Commission had warned against MEXC in March 2024.
European restrictions have also affected the exchange’s operations. In August, MEXC announced plans to leave the Netherlands, encouraging customers to transfer their assets before October 31 and scheduling final offboarding for November 16. The exchange identified MiCA-authorized Bybit EU as an alternative for affected customers.
That withdrawal follows earlier warnings from Dutch regulators about MEXC providing cryptocurrency services without the required authorization.
Treasury’s latest action is considerably broader in its potential financial reach. A US transfer prohibition may affect relationships with financial institutions that provide access to dollar payments, banking infrastructure and regulated cryptocurrency services.
It does not automatically prevent every non-US counterparty from dealing with MEXC. The immediate legal obligations fall on covered US financial institutions, although international financial firms with US connections may need to examine whether particular transactions fall within the prohibition.
For customers, the practical position remains less settled. MEXC says its services are operating normally, but it has not detailed whether the order will affect specific deposit methods, withdrawal channels, fiat settlement providers or institutional relationships.
Treasury described MEXC as one of the world’s 20 largest cryptocurrency exchanges, processing more than $1 billion in daily transactions and maintaining approximately $5 billion in reserves as of September 2026.
Those figures provide context for the exchange’s operational scale, but they do not measure how much of its activity depends on US financial institutions. Nor does the $16.7 billion figure represent assets currently held by MEXC or funds seized under the order.
The exchange’s response is important here, though it leaves unanswered how its banking relationships will work after the restriction starts.
The enforcement action forms part of Operation Economic Outcast, Treasury’s campaign launched in August to restrict financial networks accused of supporting Iranian sanctions evasion. On November 6, Treasury also sanctioned eight Canadian money services businesses over alleged connections to Iranian financial activity.
MEXC now faces two immediate developments: publication of the FinCEN order in the Federal Register, which will establish the effective date, and the outcome of the independent compliance review announced by the exchange.
Its ability to maintain trading and withdrawals does not resolve the financial-access question. The US prohibition targets the institutions that can send or recieve funds involving MEXC, and the exchange has yet to explain how much of its international operations depends on those connections.
Johan Shamshad is Editor-in-Chief at Dave Finances, covering financial markets, digital assets, trading platforms, brokers, fintech, payments and regulation. Since 2023, he has also worked as an editor at Gulf News, the UAE English-language newspaper published by Al Nisr Publishing LLC. His work focuses on market-moving developments, company disclosures, regulatory changes and trading infrastructure, with an emphasis on primary-source verification and practical context for traders and investors.