The United States has raised concerns over Iran's 'tollbooth' system in the Strait of Hormuz, where ships are required to pay fees for safe passage. Following U.S. and Israeli strikes on February 28, Iran has tightened its control over this critical maritime chokepoint, which is vital for global oil and gas trade. The U.S. Office of Foreign Assets Control (OFAC) has warned that both U.S. and non-U.S. entities could face penalties for complying with Iranian demands for transit payments. Reports indicate that fees can reach up to $2 million per vessel, with Iran offering alternative routes closer to its coastline. The U.S. has identified at least five payment mechanisms that Iran is soliciting, including direct cash transfers and digital assets. The warning comes as part of a broader U.S. naval blockade aimed at limiting Iran's oil exports and maintaining open access to the Strait of Hormuz, through which approximately 20% of global oil trade passes.