US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

The United States and Iran have formally announced a written diplomatic agreement on 14 June 2026, establishing a 60-day extendable window to negotiate a final deal on Iran’s nuclear programme. This interim Memorandum of Understanding (MOU), slated for signing in Geneva on 19 June, includes a ceasefire, reopening of the Strait of Hormuz, and technical talks on enriched uranium stockpiles [2]. Despite this progress, the crowd-implied probability of a final signed instrument by August 2026 remains at 0%, reflecting deep scepticism about whether negotiations will culminate in a mutually binding document.

Historically, US-Iran nuclear diplomacy has faltered repeatedly, most notably with the 2018 US withdrawal from the JCPOA under the first Trump administration, which triggered Iran’s move toward industrial-scale enrichment by 2025 [6]. Comparable interim deals, such as the 2013 Geneva interim agreement, also failed to produce a comprehensive final accord. Programmatic traders should model this market as a low-probability binary event, using conditional orders to hedge against sudden shifts if key unresolved issues—such as sanctions relief details or IAEA inspector access—are clarified [3][4].

Traders must monitor scheduled technical working groups on sanctions and nuclear activities, expected to form within days, alongside any official statements from Iranian Foreign Minister Abbas Araghchi or US Vice President JD Vance on progress [3]. A critical catalyst is the June 19 MOU signing; failure to sign or subsequent disputes over inspection access could derail the entire process [2]. Recent reports confirm unresolved tensions over Iran’s enriched uranium reserves and the extent of sanctions waivers, which remain pivotal to final deal viability [3]. Any announcement confirming IAEA site access or asset unfreezing would significantly alter the probability landscape [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). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.