US and Iran sign an agreement by 2026?

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Market context

The question hinges on whether the United States and Iran will formalise any written accord before the end of July 2026. The 90% crowd probability reflects expectations of diplomatic engagement rather than a return to the 2015 Joint Comprehensive Plan of Action (JCPOA) framework. Under the Trump administration (2017–2021), the US withdrew from the JCPOA and reimposed sanctions; the Biden administration rejoined negotiations but made limited progress. The incoming Trump administration's stance on Iran remains uncertain, though Trump's previous posture favoured maximum pressure over negotiated settlements.

Historical precedent suggests that US-Iran agreements, when reached, typically emerge from either crisis-driven negotiations or sustained multilateral pressure. The 1981 Algiers Accords resolved the hostage crisis; the JCPOA itself took over a decade of intermittent talks to conclude. The current 18-month window (through July 2026) is compressed relative to these timescales, yet the definition here encompasses any written agreement, not merely a comprehensive nuclear deal. This breadth—covering sanctions relief, prisoner exchanges, or confidence-building measures—materially raises the probability threshold.

Traders should monitor statements from the incoming administration regarding Iran policy, scheduled UN General Assembly sessions where both nations typically address nuclear and sanctions matters, and any backchannel diplomatic signals reported by Reuters or AP. The catalyst most likely to shift this market would be either a formal announcement of bilateral talks or a significant geopolitical event (regional conflict escalation, sanctions relief announcements) that prompts written formalisation of any understanding between the parties.

Methodology

This page tracks US and Iran sign an agreement by 2026? 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. Trump Prediction 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

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On Trump Prediction, 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.

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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.

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