What Moved the Market
The Polymarket contract “US x Iran ceasefire by May 31?” rose 6.5 percentage points in the last 24 hours to 47.0%. The move is extreme relative to recent trading, with a 24h z‑score of 28.0 and a 7d z‑score of 8.0.
This market resolves Yes if the United States and Iran publicly and mutually confirm a ceasefire agreement by 11:59 PM ET on May 31, 2026. The market opened on March 2, 2026 and closes on May 31, 2026.
Why It Likely Moved
- Repricing appears driven by recent, on‑record US government statements that operational objectives in Iran are approaching completion. President Trump said the mission was “nearing completion” on April 2, 2026, signaling a potential phase shift in operations, according to the White House/DoD channel on war.gov.
- Markets reacted to Secretary of State Marco Rubio’s April 1 remarks that objectives are on or ahead of schedule, that resolution is “weeks, not months,” and that “messages [are] being exchanged” with potential for direct meetings, per the US Department of State.
- The latest headlines framed a deadline and an imminent presidential press conference on Iran policy, prompting positioning for possible announcements that could include de‑escalatory steps before May 31, as reported by NPR on April 6.
- A modest 7‑day decline in Brent crude (−2.38% to $110.1/bbl) may align with markets assigning slightly higher odds to near‑term de‑escalation or managed risk around the Strait of Hormuz, consistent with the above official signals.
How Strong the Move Is
Today’s 6.5pp rise is an extreme single‑day repricing by this market’s standards (24h z‑score 28.0). The 7‑day change is smaller at +1.5pp but still registers as extreme relative to recent volatility (7d z‑score 8.0).
Taken together, this looks like a sharp, event‑driven spike rather than a multi‑session trend. The jump lifted odds toward even but stopped short of a decisive regime shift.
Cross-Market Confirmation
- “US x Iran ceasefire by April 30?” rose 6.0pp to 29.0% (7d −2.0pp), confirming broader near‑term optimism today but not yet reversing last week’s drift lower.
- “US x Iran ceasefire by April 15?” rose 4.0pp to 15.0% (7d −3.0pp), directionally consistent but still implying low odds of an agreement in the immediate term.
- “US x Iran ceasefire by April 7?” moved only +0.15pp to 2.3% (7d −5.15pp), a clear divergence that underscores skepticism about an imminent deal in the next few days.
News & Real-World Context
- The US government framed operations as nearing goals: President Trump said objectives in Iran are “near completion” on April 2 (war.gov). One day earlier, Secretary of State Marco Rubio detailed that objectives were on or ahead of schedule, reiterated “weeks, not months,” and noted active message exchanges and openness to talks (US Department of State, published April 1).
- Diplomatically, the UK reported Foreign Secretary‑led talks on the Strait of Hormuz on April 2, signaling allied coordination on maritime security (UK government). The UK also emphasized UN–Arab League coordination at the UN Security Council on April 2 (UK government).
- On April 6, media highlighted a looming presidential press conference and a deadline posture toward Iran, injecting timing sensitivity into markets (NPR; NPR). AP also reported new claims by President Trump about a risky rescue of a downed US crew in Iran, noting some details remain unverified by officials (AP News, April 6).
Bottom Line
Pricing shifted toward a ceasefire by May 31 after authoritative US government statements indicated operations are nearing completion and communications with Iran are ongoing, with deadline‑focused headlines adding immediacy. The move is a sharp, event‑driven repricing rather than a confirmed trend; no mutual ceasefire statements have been issued.
Market Conditions at Time of Writing
- Current Probability: 47.0%
- 24h Change: +6.5pp
- 7d Change: +1.5pp
- Volume (24h, $): 412,481.65
- Open Interest ($): 223,698.40
- Spread (pp): 1.0
- Z-score (24h): 28.0
