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PolymarketGeopoliticsUpdated 19m ago

Will the next diplomatic US-Iran meeting be in Switzerland by September 30, 2026?

Market probability
0.6%
0.5 percentage points
over 24 hours1.1%0.6%
11 days until the event deadline
Deadline: September 30, 2026 at 11:59 PM ET

Data is not live — latest snapshot Sep 19, 9:54 AM ET

A repricing with partial backing — read the new probability with some caution.

The pricing has partial support: healthy trading volume and market depth, a tight spread.

How credible was the move?

Three separate questions — a move can be genuine while the latest price is still settling. Methodology →

Move validity

Is the move backed by real trading and depth?

Moderate

The pricing has partial support: healthy trading volume and market depth, a tight spread.

Consensus stability

Has the market settled at the new probability?

Forming

Movement has slowed (0.4 points over six hours) but the market has not fully settled.

Contract clarity

Will the rules resolve without ambiguity?

High

The resolution rules are relatively specific, with a named source and a defined deadline.

Recent trade activity$139.2 traded

From the latest trade tape (most recent 200 prints) — a live activity sample, not a lifetime total.

What this market actually measures

On June 22, the first round of U.S.-Iran diplomatic talks in Switzerland concluded, with mediators reporting progress toward a roadmap for a final deal and follow-on technical talks expected to continue (see: https://www.aljazeera.com/news/2026/6/22/us-iran-agree-on-roadmap-towards-final-deal-in-switzerland-talks). This market will resolve according to the country in which the next formal senior-level round of peace …

This summary shows the opening of the venue's official rules. ProbCast has not yet generated an independent plain-English interpretation for this contract — review the full rules before relying on it.

View full official resolution rules

On June 22, the first round of U.S.-Iran diplomatic talks in Switzerland concluded, with mediators reporting progress toward a roadmap for a final deal and follow-on technical talks expected to continue (see: https://www.aljazeera.com/news/2026/6/22/us-iran-agree-on-roadmap-towards-final-deal-in-switzerland-talks). This market will resolve according to the country in which the next formal senior-level round of peace talks between representatives of the United States and Iran begins by September 30, 2026, 11:59 PM ET. A qualifying round must be a deliberate in-person diplomatic meeting or negotiating round concerning US-Iran relations, involving senior representatives of both the United States and Iran who are acting in an official capacity and are authorized to conduct or materially direct diplomacy on behalf of their governments. Indirect in-person diplomacy through designated mediators, facilitators, or interlocutors will qualify, provided senior representatives of both the United States and Iran are participating in the same formal diplomatic process with the knowledge and authorization of their respective governments. The representatives need not be in the same room at the same time. Follow-on technical talks from the June 22 Switzerland round will not qualify by themselves. Technical, staff-level, working-group, implementation, monitoring, preparatory, or deconfliction meetings will not qualify unless they occur as part of a new formally convened senior-level U.S.-Iran peace-talks round. Brief greetings, chance encounters, photo opportunities, ceremonial appearances, or talks not deliberately aimed at diplomacy or negotiation will not count. The meeting must be in-person (including indirect in-person meetings) and must be publicly acknowledged by either government or reported by a consensus of credible media. Remote meetings, phone calls, or other meetings where the relevant parties are not present will not count. If a qualifying round occurs in more than one country, resolution will be based on the country where the first qualifying senior-level diplomatic session begins. If the next qualifying round begins in any country in the Middle East or North Africa other than the listed options, this market will resolve to “Other - Middle East/North Africa.” If the next qualifying round begins in any country in Europe other than the listed options, this market will resolve to “Other - Europe.” For purposes of this market, countries’ regions will be determined based on the U.S. State Department’s regional classifications in the “Countries and Areas List” (https://www.state.gov/countries-and-areas-list). Any country classified as part of “Europe and Eurasia” will be considered to be in Europe. Any country classified as part of “Near East (Middle East and North Africa)” will be considered to be in the Middle East/North Africa. If the next qualifying round begins in any unlisted country that is not classified in either specified region, this market will resolve to “Other.” If no qualifying round begins by September 30, 2026, 11:59 PM ET, this market will resolve to “No Meeting by September 30.” The resolution sources for this market will be official information from the governments of the United States and Iran, and a consensus of credible reporting.

What could move this market next?

  • The market's deadline arrivesSeptember 30, 2026 at 11:59 PM ET

    The contract must resolve based on what has happened by this date.

Derived from the contract's own mechanics as of Sep 19, 10:12 AM ET. ProbCast does not list scheduled meetings, announcements, or data releases it cannot verify.

Advanced analysis (experimental)

Research signals — these models are still accumulating the history needed for full validation, and they can disagree with the headline read. Model confidence: low · expected error ±16 pts.

Quote-drivenLegacy movement classifier: watch

What's happening

medium classifier confidence
Quote-driven

A tight, deep, quote-driven book with little executed flow. The price is stable but reflects resting quotes more than active trading.

  • Tight spread on a liquid, calm market

The latest price is a usable but caveated read — weigh it with the market state.

More details — reliability score, dynamics, durability
Reliability score
42Medium
Where the price path tends to go next602 observed
  • Choppy / mean-reverting87%
  • Thin-liquidity spike4%
  • Stable consensus4%

Short-term motion of the price line (~1h), distinct from the environment above — not a prediction of the final outcome.

DurabilityHigh· half-life ~19h
PredictabilityStable

Secondary read: leaning toward Thin market.

A read-only classification of the market environment — how much weight the current price deserves as a read of consensus. It describes conditions, never a trade.

Market data

24h volume

$28K

Liquidity

$64.5K

Total volume

$588.7K

Category
Geopolitics
Venue
Polymarket
Open interest
Spread
0.8 pts
Best bid
0.2%
Best ask
1.0%
7-day range
0.1% – 1.1%
Resolves
Sep 30, 2026
Change (pts)1H+0.56H+0.424H-0.57D-0.5

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