US announces new Iran agreement/ceasefire extension?

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Market context

Direct military confrontation between the United States and Iran has remained largely contained since early 2024, despite sustained proxy activity and periodic escalations in the Middle East. A formal announcement extending or formalising a ceasefire agreement would represent a significant diplomatic shift, requiring explicit public commitment from Washington to continued restraint. The 3% implied probability reflects the substantial structural barriers to such an announcement: no sitting administration has formally codified a ceasefire with Iran through official channels in recent decades, and current geopolitical conditions—including ongoing Israeli operations in Gaza and Lebanon, Iranian ballistic missile tests, and domestic political pressures in both capitals—create few incentives for either side to formalise de-escalation publicly.

Historical precedent offers limited guidance. The 2015 Joint Comprehensive Plan of Action (JCPOA) was a multilateral nuclear agreement rather than a ceasefire framework, and its collapse in 2018 established a pattern of unilateral withdrawal rather than extension. Comparable cases of US-adversary ceasefire formalisations are rare; most de-escalations occur through tacit understanding or backchannel arrangements rather than announced agreements. The current probability discount reflects this historical scarcity.

Traders monitoring this market should track State Department press briefings, UN Security Council statements, and Iranian official media for any language signalling diplomatic engagement on military restraint. Scheduled Congressional testimonies on Iran policy and any unexpected high-level diplomatic meetings would serve as leading indicators. News cycles around regional escalations—particularly Israeli-Iranian exchanges or Houthi attacks on shipping—typically reduce the probability window, as they narrow space for formalised agreements.

Methodology

We track US announces new Iran agreement/ceasefire extension? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.