US-Iran Ceasefire Extension Odds on Polymarket: August 2026

The Islamabad memorandum of understanding gave the US and Iran 60 days to turn a ceasefire into a final deal, a window that wire reports now put at expiring around August 17. Polymarket's "US-Iran 60 day negotiation period extended?" contract has priced that clock running out: from a 76.5c high on August 6 to 13c now, down 10c on the day and 57c on the week. As of 2026-08-15 07:05 UTC, the best bid is 12c with $25,585 resting behind it and the best ask is 13c on just $43.74 - a thin offer at the top of a book that has otherwise turned decisively toward "No." Numbers below are from the Gamma and CLOB APIs, fetched at that time.

What has to happen, and who gets to say so

Polymarket's market description traces the clock to a June 14, 2026 announcement of the MOU - a Pakistan-brokered agreement that paused the US-Israel-Iran war and opened 60 days to negotiate a "final deal," covering Iran's nuclear program, sanctions relief, frozen-asset releases, and reopening the Strait of Hormuz. Wire coverage this week has converged on August 17 as the date that window runs out. The contract resolves "Yes" only if both the United States and Iran publicly and officially announce an extension by August 20, 11:59pm ET - and the rules are specific about what doesn't count: anonymous or unattributed reports, statements from people not authorized to speak for either government, and third-party speculation are all explicitly excluded. A mutual announcement means both sides have to say so, not one side or a mediator relaying what they've heard.

What actually moved it

The contract held in the 70-76.5c range through August 6-8, still pricing an extension as the likely path. That changed on August 9, when Iranian Foreign Minister Abbas Araghchi told reporters Tehran was not in active talks with Washington and would not resume negotiating until the US "ends its violations" of the MOU - a reference to strikes the US resumed in July - and compensates Iran for them. The contract fell from 54.5c to 41.5c within thirty minutes that evening and kept sliding through August 10, when President Trump added his own precondition, telling reporters he would seek compensation from Iran before talks continue, while describing the two sides as "semi-negotiating" and "low-keying it." By August 10 close the contract had roughly halved again, into the mid-20s.

EXTENSION PROBABILITY, AUG 6 PEAK -> NOW (AUG 15 07:05 UTC)
Aug 06 high   76.5c
Aug 09 (Araghchi: not negotiating)   41.5c
Aug 12 (unconfirmed report, intraday)   41.5c
Now   13.0c

Why an "agreement to extend" story only bought 90 minutes

On August 12, Turkish wire service Anadolu reported that the US and Iran had "agreed to extend" the 60-day period, citing a source close to the mediation process; outlets from Al Jazeera-adjacent regional press to Saudi Gazette ran versions of the story through the day. The contract popped from about 29.5c to a 41.5c intraday high right as the report circulated at 09:30 UTC. It didn't hold: within 90 minutes the price was back below 24c, and by day's end it had settled near 25c. The reporting itself explained why - every version of the story noted that "neither Washington nor Tehran had publicly confirmed" the reported agreement, and that the two sides were still exchanging messages over the extension's length. That's precisely the kind of leaked, mediator-sourced claim the market's own rules rule out: a real signal that talks continue, but not the joint, on-the-record statement needed to resolve "Yes." The brief spike looks like traders buying the headline before checking the resolution criteria against it.

Nothing nearby is pricing a breakthrough either

The extension contract isn't an outlier - every related Iran market on Polymarket is pricing the same stalemate. "US announces end of Iranian blockade by August 31?" sits near 20-21c, down another 3c on the day. "Strait of Hormuz traffic returns to normal by August 31?" is at 1.6c. "US-Iran Final Nuclear Deal by August 31, 2026?" is at 1.1c, with the market pushing most of its remaining probability further out still - 12c by November 30, 18c by December 31, the two highest prices on that ladder. None of these numbers describe a market expecting a near-term resolution - they describe a market that has watched three months of missed deadlines and reset its expectations to match.

Tracking a ladder of dates, not just one number

A story like this one lives across half a dozen related contracts with different dates and different resolution language, which is awkward to follow a headline at a time. In polymarket-tui, searching "Iran" surfaces the whole ladder together, with 24-hour price change and volume on each contract, so a swing like August 12's spike-and- fade shows up as a market move next to the rest of the family instead of a one-off headline.

$ uv tool install polymarket-tui
$ polymarket-tui

No account is needed to browse markets, books, and charts. The install page has Homebrew and one-liner options.