US-Iran Final Nuclear Deal by…?

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Market context

On 17 June 2026, US President Donald Trump and Iran’s leader signed an initial pact to end hostilities, suspend sanctions and open a 60-day negotiation window on Iran’s nuclear programme, with Tehran agreeing to dilute its enriched uranium stockpile in return for economic relief[1][5]. This agreement, described as a memorandum of understanding rather than a final peace deal, mandates a permanent ceasefire and sets the stage for deeper talks on uranium enrichment levels and sanctions removal[3].

Historically, the 2015 Joint Comprehensive Plan of Action (JCPOA) imposed strict nuclear limits in exchange for sanctions relief but was withdrawn by Trump in 2018, leading Iran to resume enrichment[7]. The current 0% crowd-implied probability for a final deal by August 2026 mirrors past scepticism: while the JCPOA was signed, its enforcement collapsed quickly, and the new MoU lacks detailed nuclear provisions, requiring further negotiations that may stall[3][4]. Traders should watch for announcements from the US-Iran High Level Committee, scheduled meetings on maritime security in the Strait of Hormuz, and any shifts in Netanyahu’s stance on dismantling Iran’s enrichment sites[3][4]. Recent reports indicate progress on ending the war, but Iranian officials caution that nuclear details remain unresolved, with a 30–60-day window still needed for a final agreement[4].

The settlement hinges on whether a qualifying written instrument is mutually signed before 23:59 ET on 31 August 2026. Given the MoU’s broad framework and the absence of enforcement mechanisms for nuclear dismantling, the path to a final deal remains uncertain, with key dependencies including Iran’s compliance on uranium reduction and US willingness to relax its demand for perpetual enrichment suspension[3][4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.