US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

The United States and Iran have signed an initial agreement to end their recent war, mandating Tehran to reduce its highly enriched uranium stockpile while suspending key US sanctions and reopening the Strait of Hormuz. This interim pact, finalized by President Trump on 17 June, establishes a 60-day window for negotiations toward a permanent cessation of hostilities and a future nuclear deal, though Trump retains the option to resume military action if commitments are breached[1]. Despite these diplomatic strides, the current Polymarket contract for a "final" written instrument remains priced at 0% YES, reflecting deep scepticism that the technical hurdles of nuclear inspections and asset unfreezing will be resolved within the settlement window ending 29 August 2026[3].

Historically, US-Iran nuclear diplomacy has been fragile; the 2015 Joint Comprehensive Plan of Action (JCPOA) was abandoned by the US in 2018, leading to renewed tensions and the 2026 conflict[6]. The current 60-day negotiation timeline mirrors the initial phase of the JCPOA but faces a more volatile backdrop involving Israeli attacks and unresolved disputes over enriched uranium reserves and the precise scope of sanctions relief[3]. Unlike the 2015 deal which only lifted specific sanctions for uranium reductions, this new arrangement aims for a broader cessation of all sanctions, yet the lack of confirmed progress on releasing the $12 billion in frozen assets suggests the "final deal" remains elusive[3].

Traders must monitor the scheduled technical working groups on sanctions and nuclear activities, which are expected to form within days, alongside any announcements regarding IAEA inspector access to damaged sites[3]. The US has granted UN nuclear watchdog access to Iranian sites as part of the interim deal, a critical step for verification, but Washington and Tehran continue to clash on the details of the 14-point memorandum[4]. Any delay in the Geneva signing of the Memorandum of Understanding or further Israeli military interventions, such as the recent attack on Lebanon that postponed talks, could derail the timeline for a mutually signed final instrument[2][8]. The market’s 0% pricing implies that unless the US confirms the release of frozen assets and Iran accepts full inspection protocols without delay, the probability of a qualifying written instrument by August 2026 remains negligible[3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track US-Iran Final Nuclear Deal by…? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.