US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

The crowd-implied probability for a final US-Iran nuclear deal by the August 2026 deadline sits at just 1% on Polymarket, a stark contrast to the 100% certainty currently priced for the initial ceasefire agreement that ended hostilities earlier this month[2]. This initial pact, signed by President Trump and Iranian officials on 15 June, mandates a 60-day negotiation window for a future final deal but explicitly preserves the US option to resume military action if progress stalls[1]. The market’s low valuation reflects the historical fragility of such interim frameworks; the 2015 Joint Comprehensive Plan of Action (JCPOA) imposed strict enrichment limits for sanctions relief, yet that accord collapsed in 2018, and Iran declared it no longer bound by the terms after the deal expired in October 2025[7][8].

Traders monitoring the on-chain conditional tokens (settled in USDC on Polygon) must watch the upcoming technical talks in Switzerland, where mediators aim to finalise a roadmap for the final agreement[6]. The critical catalyst is Iran’s formal confirmation of inviting International Atomic Energy Agency inspectors to its nuclear sites, a step the US claims Iran has agreed to but which Iranian officials have not yet publicly verified[5]. Further dependencies include the phased unfreezing of Iranian assets, which Vice President Vance stated will only occur with progress toward American objectives, and the potential for Moscow to gain a key role in the negotiations as talks advance[3][6]. Without a mutually signed written instrument before the deadline, the contract resolves to “No,” regardless of the interim peace deal’s existence.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

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

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 PolyGram. 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.

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.