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Iran Fires Missiles at US Base After Pause
After Iran's overnight missile attack and US-Saudi counterstrikes, Polymarket gives the ceasefire deadline less than even odds — and Probable agrees.
Probable’s read
Medium confidence. Based on prediction-market pricing.
Market cross-check: 43% — Probable's read differs by 5 points, for the reasons below.
Polymarket prices a US-Iran effective ceasefire by July 31 at 44%, on roughly $297K in volume — a liquid enough signal to take seriously. Iran's overnight missile strike on a US base, reported by Axios and AP News, represents a clear escalation after Trump had paused strikes, and the WSJ reports Iran rejected the Omani proposal for sharing the Strait of Hormuz. These concrete escalation signals push Probable below the market's 44%, landing at 38%.
What’s likely. Iran launched what Axios called a 'surprise missile attack' on a US base overnight, the first such strike since Trump's pause — and the US and Saudi Arabia responded with strikes on Iranian proxies in Iraq, according to CNN and AP News. The WSJ reported separately that Iran rejected an Omani proposal to share control of the Strait of Hormuz, demanding more unilateral authority. Axios also reported Trump saying he is ready for 'strong military action' if talks fail, while noting that talks are ongoing. With less than 72 hours until the July 31 deadline, the sequence of overnight events makes a formally announced ceasefire within that window unlikely, though not impossible if back-channel negotiations accelerate quickly.
The evidence
Prediction markets
Polymarket traders priced a US-Iran effective ceasefire by July 31 at 44% as of Wednesday.
44%Source: Polymarket
Polymarket traders put the chance of Strait of Hormuz traffic returning to normal by July 31 at essentially zero — the market sits at 0%.
0%Source: Polymarket
The synthesis
How Probable got to 38 percent
Polymarket's ceasefire market at 44% ($297K in volume) is the main quantitative input, and the overnight news gives concrete reasons to sit below it. Iran launched a surprise missile strike on a US base — reported by Axios and AP News — while separately rejecting the Omani proposal for shared Hormuz control, per the WSJ: two distinct escalation moves in a single news cycle, each one narrowing the diplomatic space before July 31. The Strait of Hormuz normalization market sitting at 0% on over $730K in Polymarket volume captures trader conviction that no broader de-escalation arrives by month-end. The sharpest skeptical read here is not that 38% is too low — it is that the market's own 44% may still be too generous, given how concretely the overnight events appear to have closed off the short window remaining before the deadline. Probable lands at 38% to reflect those signals, while acknowledging Trump's reference to ongoing back-channel talks, per Axios, as the residual path to a surprise agreement.
Why it matters to you
A ceasefire or its absence by July 31 will determine whether the current lull in US strikes becomes a durable de-escalation or collapses back into open military exchange, with consequences for oil markets, regional security, and the Strait of Hormuz — through which a significant share of global oil shipments pass.
What to watch
Any formal statement from CENTCOM or the Iranian foreign ministry signaling a mutual halt to offensive operations before July 31 would be the clearest resolution signal; a second Iranian missile launch or additional US strikes before then would effectively settle the question as a no.
Further reading
- Axios — “Iran launches missiles at U.S. base for first time since Trump paused strikes”
- AP News — “US thwarts an Iranian missile attack and launches strikes with Saudi Arabia against militias in Iraq”
- WSJ — “Iran Rejects Omani Proposal to Share Strait of Hormuz, Demands More Control”
- Axios — “Trump to Axios: I'm ready for 'strong military action' if Iran talks fail”
- Polymarket
- Polymarket
The question we’re forecasting
Will a US-Iran effective ceasefire be announced by July 31, 2026?
Resolves by July 31, 2026 — then we grade it yes/no on the scoreboard.
From the briefing
This forecast was published in Probable’s briefing on Wednesday, July 29, 2026: Wednesday on Probable — Japan's earthquake death toll climbs to 13 as the US-Iran confrontation intensifies overnight.
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Probable’s forecasts synthesize prediction markets, professional analysts, public opinion, and official data. Drafted with AI from cited sources. Reviewed before publishing. Not financial advice. Methodology · Spot an error?