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US-Iran Permanent Peace Deal by May 31, 2026: Polymarket Odds Plummet Amid Stalled Talks and Hardline Stances

A Polymarket prediction market indicates a low 17.5% probability of a permanent peace deal between the US and Iran by May 31, 2026, reflecting recent diplomatic setbacks and a hardened stance from both sides.

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— 3 min read

The prediction market on Polymarket, asking "US x Iran permanent peace deal by May 31, 2026?", currently shows a mere 17.5% chance of a "Yes" resolution, with the "No" outcome heavily favored at 82.5%. This significant trading volume of over $21 million underscores global skepticism regarding a lasting diplomatic breakthrough between Washington and Tehran within the stipulated timeframe. The market defines a permanent peace deal as an agreement explicitly ending military hostilities, excluding temporary ceasefires or non-definitive statements.

The low odds reflect a series of recent developments that have dampened hopes for de-escalation. Following a fragile two-week ceasefire announced on April 7, 2026, which has seen violations from both sides, diplomatic efforts have faltered. On May 11, 2026, President Donald Trump unequivocally rejected Iran's latest peace proposal, describing it as "totally unacceptable" and a "piece of garbage". This rejection came after days of deliberation, with Iran's foreign ministry initially calling its offer "reasonable and generous," emphasizing an end to the war, lifting of the US blockade, release of frozen assets, and safe passage through the Strait of Hormuz.

Key sticking points remain deeply entrenched. The United States continues to demand an end to all Iranian nuclear enrichment activity, the transfer of highly enriched uranium (HEU) outside the country, and the dismantling of nuclear facilities. Iran, conversely, has sought to decouple nuclear discussions from immediate ceasefire negotiations, proposing to address them in a later, second stage. Furthermore, the future of Iran's ballistic missile program and its support for regional proxies like Hezbollah are major points of contention. The Strait of Hormuz, a critical waterway, remains a flashpoint, with the US maintaining a naval blockade on Iranian ports while Iran has effectively restricted most traffic.

The current market odds of 17.5% for a permanent peace deal by May 31, 2026, represent a significant decline from earlier in April, when probabilities for a deal by the same date were as high as 50%. This downward trend is a direct consequence of the breakdown in recent negotiations and the hardened rhetoric from both American and Israeli leadership. Israeli Prime Minister Benjamin Netanyahu has publicly stated that military conflict with Iran will persist until its highly enriched uranium is physically removed. President Trump's recent comments also indicate a consideration of renewing military operations, further signaling a preference for continued pressure over immediate diplomatic resolution.

Expert opinions largely align with the market's bearish sentiment. Analysts note a prevailing stalemate, with both Washington and Tehran exploring potential compromises but facing deep divisions on fundamental issues. While some observers suggested Iran's latest proposal showed some movement on nuclear assurances, the critical demand for transferring enriched uranium out of the country was not met. The consensus among geopolitical analysts is that, given the current maximalist positions and the short timeframe remaining until May 31, a comprehensive and permanent peace deal is highly improbable. The path to a qualifying agreement appears event-dependent rather than a structural shift in relations.

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Market data fetched at 2026-05-12 06:17 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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