US-Iran nuclear deal by May 31?

Platform comparison

Market context

Negotiations between Washington and Tehran over Iran's nuclear programme have stalled since the Trump administration withdrew from the Joint Comprehensive Plan of Action in 2018. A new bilateral agreement would require both sides to move substantially from their current positions: the US demands verifiable constraints on uranium enrichment and inspections; Iran seeks sanctions relief and recognition of its right to civilian nuclear activity. The 18-month window to May 2026 represents a compressed timeframe for talks that previously took years to conclude.

Historical precedent suggests formal nuclear agreements between adversaries require sustained diplomatic engagement and political will from both capitals. The original JCPOA took fourteen months of intensive negotiations following the interim Geneva accord of 2013. The 1994 Agreed Framework between the US and North Korea took eighteen months but ultimately collapsed. Current US policy under the Biden administration maintains openness to diplomacy, though no active negotiations are underway as of early 2025. Iran's government has signalled willingness to return to talks if sanctions are lifted, but structural mistrust remains high.

The critical catalyst will be whether either administration signals a shift towards direct negotiations before mid-2026. Traders should monitor statements from the US State Department and Iranian Foreign Ministry for any announcement of preliminary talks or working groups. Congressional dynamics matter: significant Republican opposition to any deal could constrain negotiating room regardless of executive intent. Recent reporting from Reuters and AP News indicates no scheduled negotiations, making the 20 per cent probability reflect the low but non-zero chance of unexpected diplomatic breakthrough within the settlement window.

Methodology

This page tracks US-Iran nuclear deal by May 31? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. PolyGram routes every trade through to Polymarket — at 0% fees.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

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.

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 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.

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.

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.