Polymarket sees US-Iran ceasefire by Aug 31 at 48.5% after Iran news

Iran Political-Pressure Headline Nudges Polymarket “Effective Ceasefire by Aug 31” Odds Lower

Polymarket’s ladder market on a “US x Iran effective ceasefire by… (2 week pause)” is leaning slightly against an August 31 ceasefire, with the leading strike at 48.5% Yes (51.5% No) on $1,099,713 in volume. The pricing dip follows fresh Iran-related headlines, offering a clean look at how traders map unrelated political stress signals into ceasefire-timing probabilities.

Key Takeaways

• Top-priced strike is “Effective ceasefire by August 31” at 48.5% Yes vs 51.5% No.
• After the catalyst, the leading strike drifted down 1.0 pp (49.5% to 48.5%), consistent with a weakening near-term ceasefire timeline.
• This ladder resolves on Aug 31, 2026 (23:59 UTC), with separate outcomes for each date-strike rather than one single settlement price.

A July 19 report says Iran announced the execution of two anti-government protestors. The headline adds political-pressure context around Iran, which traders may treat as a risk factor when pricing the timing of any near-term “effective ceasefire” scenario.

Ladder Pricing Breakdown: $1.10M Volume, Aug 31 at 48.5% Yes vs 51.5% No, Front-Date Strikes Stay Deep “No”

This is a price-ladder: each date is its own binary, so “August 31” at 48.5% Yes / 51.5% No does not settle the market by itself—it’s one strike on the timeline, alongside earlier dates like August 14 at 29.5% Yes / 70.5% No and July 31 at 15.5% Yes / 84.5% No (with July 18 near zero at 0.4% Yes / 99.6% No). The curve implies traders see a meaningful chance of an effective ceasefire by late August, but they assign much lower odds to it arriving in July, reflecting a steep drop-off in near-term timing. Positioning looks softer versus the recent average: the latest quoted level is below the last-5 average (49.5% vs 54.3%), and the historical summary flags bearish, moderate momentum with a reversal detected—consistent with a market that recently tried higher levels before fading. Over the last 24 hours and 7 days, the contract is down 4.0 pp, suggesting consensus is weakening rather than converging, even with over $1.09M traded.

Watch whether the ladder steepens or flattens: if August 14 and July 31 remain heavily “No” while August 31 holds near 50/50, traders are expressing timing skepticism rather than a blanket rejection of an eventual pause; any follow-through would show up first as sustained moves in the front-date strikes.

What Traders Watch Next on Polymarket: Front-End Ladder Steepening vs Flattening and Cross-Contract Positioning in Macro

Beyond this ladder, traders often cross-check nearby Polymarket contracts to see whether shifts are about timing or a broader regime repricing across macro-style risk. The biggest liquidity signal is 70.0% on “Will the U.S. invade Iran before 2027?” with $44,793,826 in volume, while 73.15% on “Iran leader end of 2026?” ($32,543,803) tracks longer-horizon political continuity. For nearer-dated event risk, 52.5% on “Iran full airspace closure by…?” ($4,538,011) and 27.0% on “Iran announces withdrawal from MOU negotiations by…?” ($7,283,993) give traders adjacent settlement points to triangulate how quickly the tape is repricing headline-driven probabilities.

Odds Trend

By the Numbers

• Platform: Polymarket
• Market: US x Iran Effective Ceasefire by…? (2 week pause)
• 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: ~$1,099,713

Top strike rungs

+1 more strikes not shown

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