US-Iran nuclear deal by May 31?

Platform comparison

Market context

Negotiations between the United States and Iran over nuclear programme restrictions remain stalled since the Trump administration withdrew from the Joint Comprehensive Plan of Action in 2018. An official bilateral or multilateral agreement by May 2026 would represent a significant diplomatic reversal, requiring both parties to overcome years of escalating sanctions, proxy conflicts, and mutual distrust. The market's 18% implied probability reflects the structural difficulty of such a breakthrough within the timeframe, though diplomatic channels have not entirely closed.

The 2015 JCPOA provides the most relevant precedent: it took roughly two years of intensive negotiation under the Obama administration to conclude, and its collapse demonstrates how fragile such accords can be. Current conditions differ markedly—Iran's nuclear programme has advanced considerably since 2018, enriching uranium to near-weapons-grade levels, whilst US domestic politics remain polarised on Iran policy. Any new deal would need to address both sides' expanded positions, a substantially harder negotiating task than the original JCPOA framework.

Traders should monitor statements from the incoming US administration (particularly Treasury and State Department appointments), Iranian parliamentary elections scheduled for 2026, and International Atomic Energy Agency reports on uranium enrichment levels. Recent reporting from Reuters and the Financial Times has noted quiet backchannel discussions, though no formal talks have been announced. Catalysts include UN Security Council resolutions, sanctions relief proposals, and any direct diplomatic engagement at multilateral forums. The absence of scheduled negotiations as of early 2025 suggests movement would need to accelerate significantly to meet the May deadline.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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 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.

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.