Post-ceasefire warning hits US-Iran deal bets, Polymarket Aug 31 at 23.5%
US–Iran Nuclear Deal by Aug. 31, 2026: Polymarket Odds Slip After “Fragile Transition” Post‑Ceasefire Warning
A post-ceasefire assessment warning that the Middle East is entering a fragile transition period has coincided with softer pricing on Polymarket’s “US-Iran Final Nuclear Deal by…?” ladder. The market’s leading contract, “US-Iran Final Nuclear Deal by August 31, 2026?”, was last priced at 23.5%, down from 28.5%.
Key Takeaways
- Polymarket prices a 23.5% chance of a US-Iran final nuclear deal by August 31, 2026.
- Odds eased after commentary described a fragile post-conflict transition with regional divisions over the ceasefire framework and Strait of Hormuz security.
- The ladder resolves on Aug. 31, 2026, and the leading strike fell 5.0 percentage points to 23.5%.
An expert on Middle Eastern politics said the region is moving into a more uncertain phase even after an Iran ceasefire deal. Arang Keshavarzian, a professor of Middle Eastern and Islamic studies at New York University, described the aftermath of the Iran conflict as a fragile and uncertain transition period. He said regional powers remain divided over the ceasefire framework, suggesting unresolved differences could complicate next steps. He also highlighted concerns about security in the Strait of Hormuz as a key pressure point. The comments were published on June 23, 2026.
Polymarket Ladder Pricing: $1.33M Volume as Aug. 31 Strike Falls 5 Points to 23.5% (Yes 23.5% / No 76.5%)
On Polymarket, the “US-Iran Final Nuclear Deal by August 31, 2026?” strike led at 23.5% Yes versus 76.5% No, with total market volume at $1,330,289. Earlier-dated strikes were priced lower, including “by July 31” at 4.5% Yes / 95.5% No and “by June 30” at 0.45% Yes / 99.55% No, signaling limited confidence in a near-term agreement. Among the mid-August strikes, “by August 18” traded at 21.5% Yes / 78.5% No while “by August 13” was 13.5% Yes / 86.5% No, indicating a steep drop-off in probability as the deadline moves forward. The leading strike’s odds were last marked at 23.5%, a 5.0-point decline from 28.5%.
The contract’s key milestone is the Aug. 31, 2026 resolution date; traders will be watching whether pricing shifts toward earlier August strikes versus the current concentration near the end-of-August deadline.
Beyond the Nuclear Deal: Other High‑Volume Geopolitical and Macro Contracts Polymarket Traders Are Tracking
Beyond the nuclear file, Polymarket order flow is clustering around near-term Gulf security and regime-risk gauges. Traders have leaned heavily toward “No” in “Will the Iranian regime fall by June 30?” at 99.75% on $63,713,842 of volume, while shipping-linked bets remain active, including “Strait of Hormuz traffic returns to normal by end of June?” with “No” at 97.75% on $33,176,659. Further out the curve, “Strait of Hormuz traffic returns to normal by July 15?” shows “No” at 76.5% on $2,605,826, and “Strait of Hormuz traffic returns to normal by July 31?” has “No” at 54.5% on $8,206,673, underscoring how quickly sentiment deteriorates as timelines extend.
Odds Trend
| Window | Change (pp) |
|---|---|
| 24h | -1.0 |
| 7d | -1.0 |
By the Numbers
- Platform: Polymarket
- Market: US-Iran Final Nuclear Deal by…?
- Contract type: Price strike ladder: each rung has separate Yes/No; Yes means the spot price is above that USD strike at settlement.
- Resolution window: Aug 31, 2026 (UTC)
- Status: Active (open for trading)
- Volume: ~$1,330,289
Top strike rungs
| Strike | Yes | No |
|---|---|---|
| August 31 | 23.5% | 76.5% |
| August 18 | 21.5% | 78.5% |
| August 13 | 13.5% | 86.5% |
| July 31 | 4.5% | 95.5% |
+1 more strikes not shown
Related Markets
- Strait of Hormuz traffic returns to normal by end of June? — No 98%
- Strait of Hormuz traffic returns to normal by July 15? — No 76%
- Strait of Hormuz traffic returns to normal by July 31? — No 54%
- Will the Iranian regime fall by June 30? — No 100%
- Will __ ships transit the Strait of Hormuz on any day by June 30? — 20+ 100%