US-Iran ceasefire continues through 2026?

Platform comparison

Market context

Polymarket has this contract near a full yes at 96%, implying traders currently see a US strike on Iran before 30 September as a low-probability tail risk. On Polymarket, that view is expressed with USDC on Polygon through conditional tokens, so the price mainly reflects how participants are weighting the chance of any qualifying air or missile strike against Iran before the settlement cut-off.

The backdrop matters because the June ceasefire has already proved fragile. Reuters reported on 12 August that there had been no talks on extending it, and that Tehran wanted Washington to return to the interim pact and set a timetable for its commitments[1]. That leaves traders reading a market where the base case is still no direct US attack, but where the contract can move quickly if diplomacy unravels.

The main catalysts are official statements, any renewed mediation, and changes to military posture around the Strait of Hormuz and wider regional deployments. Reuters reported on 17 August that Iran was threatening a more offensive posture if talks stayed stalled, while the US ruled out extending the temporary ceasefire[2][4]. For this market, the key question is not rhetoric alone but whether any scheduled negotiations, force movements, or presidential and defence announcements create a credible path to a US-initiated air or missile strike before settlement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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.

UK Frequently Asked Questions

Is this market available outside the US?

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How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

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