Iran Hormuz Fee Push Stalls on Voluntary Offer

The president announced new negotiations after calling off airstrikes, but Iran insists it is not in talks with Washington.

Prediction markets price a 36.5% chance that Iran will begin collecting mandatory fees from commercial vessels transiting the Strait of Hormuz by October 31, according to Polymarket data. The probability has fallen sharply in recent weeks as diplomatic efforts have shifted the debate from compulsory tolls to voluntary contributions.

A Reuters report on July 28 detailed a Gulf-backed plan, presented by Oman, that would allow Tehran to collect voluntary fees for use of the strait rather than mandatory charges. This framework directly undercuts earlier Iranian signals, including a June 8 statement from Iran's ambassador to Moscow that the waterway would remain open but under "newly established terms" including a transit fee. Iran's foreign ministry has since said it will not impose transit tolls but will levy fees for navigation and environmental services after a grace period ending around mid-August, leaving ambiguity about the nature of any eventual payments. On July 4, Iranian officials stated they would "definitely" charge fees, but the subsequent voluntary plan has muddied the outlook. The market's alternative resolution dates, including a December 31 outcome trading at 76%, suggest traders see a later implementation as more likely.

U.S. officials, including President Trump, have rejected any tolls or fees as a dangerous precedent under international maritime law, insisting on the pre-war status quo of free passage. The Polymarket resolution criteria require an official announcement and commencement of mandatory charges, a threshold that the voluntary-fee proposal does not meet. The 24-hour volume of nearly $64,000 indicates active trading as participants weigh each new diplomatic signal. The market's 33.5-point drop over the past day suggests the voluntary plan has significantly reduced expectations of a mandatory fee by the deadline. With the October 31 deadline approaching, the market's implied probability of 36.5% reflects deep uncertainty over whether Iran can enforce compulsory payments against Gulf and U.S. opposition.