US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

The **0% YES** crowd price implies the market is treating a signed or formally adopted final instrument by 31 August as essentially out of reach, even after the June roadmap and 60-day negotiation period were announced. That is an understandable favourite/underdog split: the favourite is **No**, because the June arrangement was only a framework for further talks, while the underdog case for **Yes** depends on a faster-than-expected jump from technical work to a qualifying written instrument.

History in this file points to why traders may be sceptical. Reuters said on 12 June that a memorandum of understanding could be signed “in the coming days”, but later coverage showed the process repeatedly sliding into working groups, technical talks and partial measures rather than a final accord.[10][1][5] Reuters also reported on 1 July that Doha talks were still focused on maritime traffic and unfreezing funds, with “no sign” of a lasting peace deal.[5] That leaves the main value question on whether the market is underpricing a late-stage diplomatic burst or correctly treating this as a long negotiation with multiple unresolved issues.

The catalysts are straightforward: any joint statement announcing a signed final text, a formally adopted instrument, or a publicly confirmed date for a signing ceremony would matter most; absent that, traders should watch for extensions, sanctions waivers, and whether the nuclear, sanctions and dispute-resolution working groups produce draft language quickly enough to be elevated to political sign-off.[1][2] Recent reporting also showed that some earlier progress did not include new nuclear commitments from Tehran, which is a useful reminder that headline optimism has not yet translated into a final written deal.[8][2] In handicapper terms, **No** remains the consensus side, but the only real contrarian value sits in the possibility that a terse diplomatic communiqué lands before the deadline.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews US-Iran Final Nuclear Deal by…? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

UK Frequently Asked Questions

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.