A ladder of contracts shows hope shifting to next year, with the implied odds of a first-quarter breakthrough near 38% for anyone who reaches January still waiting.
A weekend of hard lines from Washington and Tehran has nearly erased any expectation that the United States will declare an end to its blockade of Iran this month.
On Polymarket, the contract asking whether the U.S. will announce the end of the Iranian blockade by Sept. 30 fell to 4%. It stood at 21% on Aug. 1. Further-dated contracts slid as well: Oct. 31 now trades at 29%, Nov. 30 at 41%, Dec. 31 at 58% and March 31 at 74%.
The trigger was President Trump's rejection of Iran's offer to reopen the Strait of Hormuz within seven days. He also asserted that the United States holds "total control" of the strait. Iran's foreign minister, Abbas Araghchi, said Tehran would not soften its demands and was still awaiting an official U.S. response through intermediaries.
Reading the rule, not the headlines
The contract resolves only on a public, official and declarative U.S. announcement that the blockade has ended. Talks, conditional offers and hopeful commentary do not count. That precision explains the round trip in prices: optimism about negotiations lifted the contract heading into last week, and a flat rejection sent it tumbling, exactly as its resolution rule would predict.
It is also worth being specific about which blockade is at issue. This contract, opened July 27, concerns a second blockade imposed after an earlier one ended with a memorandum and military announcement in mid-June.
What the ladder implies
Laid side by side, the contracts sketch a timeline of expectations. Traders put the chance of an announcement during October at 29%. For anyone who reaches Nov. 1 without one, the implied odds of an announcement during November are about 17%. The equivalent figure for December is about 29%. For anyone still waiting on Jan. 1, the market implies about a 38% chance of an announcement in the first quarter.
In other words, the market does not see the blockade as permanent. It sees resolution as more likely than not by year-end and increasingly probable into the spring, but it has pushed the center of gravity well past the current round of diplomacy.
The oil market's version
Crude tells a consistent story. Brent traded at $106.66 on Monday, and Houthi attacks on Saudi targets have added to the supply worries. A market pricing a 58% chance of an announced end by December is compatible with an oil price that still carries a large risk premium for the months in between.
What to watch
The Sept. 30 contract expires at 11:59 p.m. Wednesday and is almost certain to resolve no. The more informative contracts are the October and December rungs, which will move first on any formal Iranian reply or any official U.S. statement.