[...]

It is not clear if last night’s ceasefire agreement will impact the toll system in the near-term, although some ships have begun moving through the strait as of April 8. The toll system has typically worked as follows:

• Ship operators contact an IRGC-linked intermediary (unnamed company) and submit vessel ownership records, flag registration, cargo manifests, destination ports, crew lists, and AIS tracking data
• The IRGC screens the vessel — checking for ties to the US or Israel; ships from enemy nations are denied entirely
• Iran applies a five-tier nationality ranking system — nations ranked 1–5 by "friendliness," with friendlier nations receiving lower toll rates
• Payment is negotiated — oil tanker fees start at approximately USD 0.50–1 per barrel of crude (rate varies by nationality tier); a fully loaded VLCC (~2 million barrels) pays approximately USD 2 million; container ships and other vessel types are negotiated individually
• Payment must be in Chinese yuan (via Kunlun Bank / CIPS) or digital assets
• After payment, the vessel receives a VHF-broadcast passcode and IRGC Navy escort through a northern corridor around Larak Island

...read more at trmlabs.com