Who will attend US-Iran signing ceremony?

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Market context

The US and Iran's June 14 announcement of a written diplomatic agreement, with signing scheduled for June 19, 2026, marks a significant shift in bilateral relations after decades of tension. The 55% crowd probability reflects genuine uncertainty about whether high-level attendance will materialise at the ceremony itself, despite the agreement's existence. Recent diplomatic breakthroughs between these nations have historically been fragile, with ceremonial attendance often contingent on last-minute political calculations rather than the agreement's substance.

Historical precedent suggests caution. The 2015 Joint Comprehensive Plan of Action saw robust initial attendance from multiple nations, yet subsequent US withdrawal in 2018 demonstrated how quickly such arrangements can unravel. More recently, the Abraham Accords signing ceremonies in 2020 featured full attendance from participating parties, though those involved regional allies rather than direct adversaries. The US-Iran context differs markedly: domestic political opposition in both capitals could prompt either side to downgrade representation or withdraw entirely, even after announcing the agreement publicly.

Traders should monitor three immediate catalysts through the July 7 deadline. First, any statements from the US State Department or Iranian Foreign Ministry regarding delegation composition will signal commitment levels. Second, congressional responses in the US—particularly from opposition figures—may pressure the administration to limit attendance or delay the ceremony. Third, any security incidents or regional escalations could provide either party with justification to postpone or cancel the signing event. The narrow window between announcement and settlement means market movement will likely accelerate as June 19 approaches and actual attendance details emerge.

Methodology

This page reviews Who will attend US-Iran signing ceremony? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Prediction Today — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

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On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.