Iran Is Charging Ships Crypto to Pass Through the Strait of Hormuz. Here Is How the System Works.

Since mid March 2026, Iran’s Islamic Revolutionary Guard Corps has been charging oil tankers and cargo vessels a transit fee of up to $2 million per crossing through the Strait of Hormuz, payable in Bitcoin, USDT, or Chinese yuan routed outside SWIFT. The system represents the first known instance of a sovereign level actor requiring cryptocurrency as the primary payment method for access to critical global trade infrastructure. At current traffic volumes, public estimates suggest the toll system could generate between $600 million and $800 million per month if applied consistently to all oil tanker and liquefied natural gas vessel transit. TCB breaks down how the system actually works, who pays, and what it means for the intersection of cryptocurrency, sanctions, and global energy trade.

Key Highlights

• The IRGC has been charging vessels up to $2 million per transit through the Strait of Hormuz since mid March 2026
• Accepted payment methods are Bitcoin, USDT, and Chinese yuan routed through Kunlun Bank via CIPS outside SWIFT
• Estimated monthly revenue from oil tanker transits alone is up to $20 million per day, or $600 to $800 million per month including LNG vessels
• Iran initially charged $1 per barrel of oil on tankers but escalated to vessel level fees within weeks
• TRM Labs and Chainalysis have both published analyses of the on chain patterns associated with the toll payment flows
• The system operates outside SWIFT entirely and uses cryptocurrency as a primary mechanism for sanctions circumvention at scale

How the Toll System Was Set Up

The system began in mid March 2026 when the IRGC issued new maritime transit instructions to vessel operators approaching the strait. Ship operators reported receiving formal notices requiring payment before transit would be authorised. The initial fee structure was denominated at $1 per barrel of oil cargo, which translated to roughly $700,000 to $2 million per tanker depending on cargo size. Within weeks, Iran moved to a flat vessel level fee structure rather than cargo denominated pricing, simplifying collection and reducing the need for cargo manifest verification.

Payment is made to IRGC controlled wallet addresses that are provided to vessel operators in advance. Bitcoin and USDT are the preferred cryptocurrencies, with USDT on TRON being particularly common given its speed and low transaction cost. Operators who refuse to pay face boarding or detention of their vessels. Multiple tanker operators and their insurers have confirmed the fee structure in unattributed disclosures to maritime journalists, though none have publicly confirmed payment for legal reasons related to sanctions compliance.

Why Cryptocurrency and Not Traditional Finance

The choice of cryptocurrency as the primary payment mechanism is not accidental. Iran has been under comprehensive U.S. and EU financial sanctions since 2012, with the most recent sanctions round in 2019 cutting Iran off from SWIFT entirely. Any dollar denominated payment through the traditional banking system would be blocked, flagged, and potentially result in criminal liability for the paying vessel operator. Cryptocurrency, particularly USDT on TRON and Bitcoin, allows payments to reach IRGC controlled wallets without passing through any correspondent bank that would trigger SWIFT based sanctions screening.

The Chinese yuan alternative, routed through Kunlun Bank via the CIPS settlement system, provides another sanctions compliant channel for operators who prefer not to use cryptocurrency. CIPS is China’s alternative to SWIFT and is not subject to U.S. Treasury enforcement. The availability of both channels gives vessel operators flexibility and reduces the risk of any single payment channel being shut down by enforcement action. The GENIUS Act’s stablecoin provisions are being debated in Congress precisely as this use case demonstrates the real world implications of dollar pegged stablecoins operating outside the traditional financial enforcement perimeter.

The Economics at Scale

Approximately 21 percent of global oil trade passes through the Strait of Hormuz on a daily basis. An average of 18 to 21 very large crude carriers transit the strait each day, each carrying roughly 2 million barrels of oil. At $2 million per vessel, the daily gross revenue from oil tankers alone is approximately $36 to $42 million, or over $1 billion per month. The more conservative public estimate of $600 million per month from TRM Labs accounts for vessels that transit without paying, vessels that have received exemptions through diplomatic channels, and periods when the toll is suspended during negotiation windows.

Even at the lower end of estimates, $600 million per month represents a significant revenue stream for a government that has been severely constrained by sanctions. For context, Iran’s entire annual oil export revenue in 2023 was estimated at approximately $35 billion. A crypto toll system generating $7 billion annually would represent a 20 percent supplement to that figure. The financial incentive for Iran to maintain and enforce the system is substantial, which explains why the toll has persisted through multiple rounds of U.S. pressure and why Iran has been willing to escalate again restrictions when diplomatic pressure reduces enforcement revenue. The reimposition of Strait of Hormuz controls on April 20 is best understood in this economic context: enforcement generates revenue, and relaxation generates diplomatic leverage that can be traded for other concessions.

On Chain Tracing: What Analysts Have Found

TRM Labs and Chainalysis have both published analyses of on chain patterns associated with the Hormuz toll payment flows. The analysis is complicated by the use of mixing services and the movement of funds through multiple wallet addresses before consolidation. TRM Labs identified wallet clusters with IRGC attribution that received USDT flows consistent with vessel sized toll payments beginning in mid March 2026. The flow volumes, timing, and wallet clustering patterns all match the reported toll structure.

Bitcoin payments appear to be mixed through Tornado Cash or equivalent obfuscation tools before reaching final destination wallets, which is consistent with IRGC blockchain practices documented in earlier TRM Labs and Elliptic research. USDT payments on TRON appear to move through fewer intermediary steps, possibly because TRON’s transaction throughput and low cost make rapid consolidation easier than on Bitcoin’s base layer. Blockchain forensics firms that worked on the Drift Protocol and KelpDAO exploit investigations have noted overlapping infrastructure in the wallet patterns, though attribution to specific state actors requires a higher evidence threshold than wallet clustering alone.

U.S. Policy Response and the Limits of Sanctions

The U.S. Treasury Department has added multiple wallet addresses associated with the Hormuz toll system to the OFAC Specially Designated Nationals list, which prohibits U.S. persons from transacting with those addresses. The practical enforcement challenge is that the vessel operators paying the tolls are predominantly non U.S. entities operating ships registered in non U.S. jurisdictions. A Greek shipping company paying a toll to transit with a tanker chartered by a South Korean refiner processing crude for Chinese industrial use does not create an obvious U.S. nexus for sanctions enforcement.

Secondary sanctions, which penalise non U.S. entities for dealing with sanctioned parties, are the primary enforcement tool available. But applying secondary sanctions to vessel operators who face the alternative of having their ships detained by the IRGC creates a legal and political complexity that the current sanctions framework was not designed to handle cleanly. The practical result is that the toll system continues to operate despite being documented and OFAC sanctioned. Bitcoin’s modest decline on April 20 compared to oil’s 5.7 percent surge suggests that markets are pricing the Iran situation as geopolitically volatile but economically managed through the toll mechanism rather than as a genuine blockade risk.

What This Changes for Crypto’s Global Standing

The Hormuz toll system is the most prominent real world demonstration to date of cryptocurrency being used as a sovereign level sanctions bypass tool at scale. It is not the first instance. North Korea has used cryptocurrency to fund its weapons programme. Russia has used cryptocurrency to evade financial sanctions since 2022. But the Hormuz case is distinctive in its scale, its visibility, and the fact that it involves a direct tax on physical commodity trade flows rather than post sanction capital flight.

This use case will accelerate regulatory pressure on stablecoin issuers, cryptocurrency exchanges, and blockchain analytics firms in the U.S. and EU to strengthen compliance infrastructure for detecting and blocking sanctioned entity transactions. It also provides the clearest argument yet for the utility of on chain transparency in a world where adversarial actors rely on cryptocurrency for sanctions evasion: the payments can be tracked, even if they cannot currently be stopped. Ethereum’s $180 billion stablecoin supply and its role as the dominant settlement layer for dollar denominated crypto activity will face renewed scrutiny from U.S. lawmakers who observe that the same infrastructure enabling institutional DeFi is also the infrastructure through which sanctioned actors are moving hundreds of millions of dollars per month.

The TCB View

The IRGC charging cryptocurrency to cross the Strait of Hormuz is the geopolitical moment that cryptocurrency’s critics have been waiting for as evidence that permissionless money is permissionless for everyone, including sanctioned state actors. The response cannot be to restrict cryptocurrency broadly. It has to be to improve on chain enforcement infrastructure fast enough that the compliance window between sanctioned wallet identification and effective blocking narrows from weeks to hours. The Hormuz toll system is operating and generating revenue precisely because that window is wide. Closing it is the legitimate policy challenge that this situation demands, and it is one that the blockchain analytics industry and regulators need to prioritise above the headline number of $600 million per month in crypto sanction busting revenue.