US-Iran nuclear deal by June 30?

Platform comparison

Market context

A formal US–Iran nuclear agreement would need to be publicly announced before 30 June to cash this market. At 28% implied probability, the crowd has this as a clear underdog, and that looks broadly consistent with the negotiating history: the 2015 JCPOA took many months of structured talks, while the current 2026 channel has already produced mixed signals, with little evidence of a near-final text. The market is pricing some chance that back-channel diplomacy can still bridge the gap, but consensus seems to be that the odds favour another missed deadline rather than a clean breakthrough.

For context, June deadlines in Iran diplomacy have often been more useful as pressure points than as finish lines. Iran rejected a Trump administration proposal on 9 June, then said it would present a counteroffer through Omani mediators, which is the main pathway traders should watch. Recent reporting from Britannica and armscontrol.org points to negotiations continuing amid sanctions, inspection, and enrichment disputes, while Iran’s suspension of some IAEA access after the 2025 strikes underscores how quickly verification issues can derail talks. The value case on the Yes side is a late-stage announcement through Oman or a surprise multilateral package; the contrarian No angle is that there is still too much daylight between sanctions relief and enrichment limits for a deal to be locked and publicly announced in time.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track US-Iran nuclear deal by June 30? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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?

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