US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

On the wire, the key point is that Washington and Tehran have already moved from indirect talks to a written framework, with Reuters reporting a preliminary agreement and a signing expected in Switzerland before the 60-day negotiation period begins[9][6]. For a trader running this market through a bot or conditional order, the practical question is not whether talks continue, but whether a *qualifying final instrument* is actually signed or formally adopted by 31 August; a framework, MoU, or roadmap does not by itself settle the market unless it meets the contract’s wording[1][2][4].

Historically, this kind of setup has usually priced as a low-probability conversion from framework to finality. Earlier rounds in February produced “progress” and “guiding principles” but still left “numerous details” unresolved, which is a familiar pattern in Iran nuclear diplomacy: early consensus on principles, followed by technical bargaining on enrichment, inspections, sanctions relief, and sequencing[3][5][11]. The 2015 JCPOA also showed how long the path from political understanding to signed text can be, and why markets often discount headline optimism until there is a signed document and a clear implementation schedule.

For programme-style monitoring, the main catalysts are the next official statements, any announced signing ceremony, and follow-up technical meetings on nuclear access, sanctions, and the Strait of Hormuz[6][8][12]. Reuters reported that a signing in Europe was under discussion and that the memorandum would start a 60-day period, while later reporting and commentary indicated the nuclear component would still require supervision and further negotiation[6][8][15]. In practice, that means a trader should watch for any published instrument text, a jointly announced adoption date, and whether both sides explicitly say the deal has been finalised rather than merely extended or framed.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Polymarket Review UK. 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%.