US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

The immediate trigger is the 14 June written US-Iran understanding, which launched a 60-day extendable negotiating period on a “final deal” over Iran’s nuclear programme and related issues. Reuters reported on 12 June that a signing was being discussed and that a 60-day negotiation phase would follow any signature, while later reporting and coverage from AP, CBS and Al Jazeera described an initial pact, technical follow-on talks, and working groups on sanctions, nuclear affairs, reconstruction and implementation.[9][14][15][1]

For traders, the key question is not whether the two sides have talked, but whether they will produce a qualifying written diplomatic instrument by 31 August. The market is therefore leaning on the next formal announcement, any published text, and whether the deal is signed or adopted in a way that meets the settlement rules. That distinction matters because earlier 2026 rounds already showed a pattern of “progress” claims without closure: Geneva talks in February were described as constructive, yet substantial gaps on enrichment, inspections and sanctions remained.[4][6][11]

Comparable cases suggest caution with a 0% crowd price only if the market is treating the current document as insufficient rather than impossible. The June framework already showed that partial agreements can move quickly into technical implementation, but Reuters and AP both emphasised that core nuclear terms, including enrichment limits and inspection access, were still being negotiated.[9][14] In that sense, the market’s outlook is being driven less by war headlines than by whether the upcoming schedule yields a signed final instrument before the deadline.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for US-Iran Final Nuclear Deal by…? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

UK Frequently Asked Questions

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Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

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Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

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Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Are UK election prediction markets available from the UK?

Yes. Betfair Exchange and Smarkets offer UKGC-regulated UK election markets (seat counts, party share, constituency results). Polymarket also lists UK election contracts with deeper global liquidity. Betfair winnings are typically tax-free for UK individuals; Polymarket profits are subject to HMRC CGT.