Polymarket

US-Iran Permanent Peace Deal by May 31: Market Odds Reflect Low Probability as Deadline Looms

With just days left until the May 31, 2026 deadline, a Polymarket prediction market on a permanent peace deal between the United States and Iran shows overwhelming odds against a 'Yes' resolution, despite recent reports of a tentative 60-day ceasefire extension.

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— 2 min read

As the May 31, 2026, deadline approaches for a Polymarket prediction market concerning a permanent peace deal between the United States and Iran, the current trading prices heavily favor a “No” resolution. With prices at 0.095 for “Yes” and 0.905 for “No,” the market's participants are expressing strong skepticism that a lasting agreement will be reached in the coming days.

The market question explicitly defines a permanent peace deal as an agreement that "explicitly indicates that military hostilities between the United States and Iran have ended or will permanently cease, or uses equivalent language clearly signaling a lasting end to military hostilities". Crucially, temporary agreements or those that do not include a definitive end to military hostilities on a lasting basis, such as a temporary ceasefire extension, will not qualify. A qualifying agreement requires either both nations to formally sign a written agreement or provide clear public confirmation of a definitively established deal.

Recent developments underscore the unlikelihood of meeting these stringent criteria by the deadline. As of May 28-29, 2026, US and Iranian negotiators have reportedly reached a tentative agreement or a memorandum of understanding (MoU) to extend the existing ceasefire by 60 days and initiate negotiations on Iran's nuclear program. While this represents a diplomatic breakthrough, it falls short of the market's definition of a "permanent peace deal."

Furthermore, this tentative agreement is still pending final approval. US officials, including Vice President JD Vance, have stated that President Donald Trump has yet to give his final sign-off, and Iran has also not definitively confirmed its acceptance. Reports from Axios, Newsday, Al Jazeera, and Fox News all highlight the provisional nature of this understanding. Adding to the complexity, some analysts suggest that senior Iranian decision-makers, including Supreme Leader Mojtaba Khamenei, may be unwilling to make the concessions necessary for a permanent agreement, particularly concerning control over the Strait of Hormuz. The Institute for the Study of War (ISW) noted on May 29 that it is "far from clear" that senior Iranian decision-makers are willing to make such concessions.

The substantial trading volume of over $70 million in this market reflects significant interest in US-Iran relations, which have been strained by months of conflict. While other Polymarket instruments show some optimism for a peace deal by the end of 2026 (with one market indicating a 67% chance by year-end), the immediate prospect of a permanent resolution by May 31 remains dim. The current market odds of 0.095 for "Yes" and 0.905 for "No" accurately reflect the critical distinction between a temporary ceasefire extension aimed at future talks and a definitive, lasting peace agreement. Given the strict resolution criteria and the absence of any confirmed permanent deal, a "No" resolution appears highly probable for this market.

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Market data fetched at 2026-05-29 12:15 UTC | Polymarket ID: 1919425

This article is generated by AI for informational purposes only. It does not constitute financial advice. Always do your own research before making any investment decisions. Data sourced from Polymarket and public web sources.

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