US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

A **YES** share pays out only if the United States and Iran have mutually signed or formally adopted the required written diplomatic instrument by the deadline; a **NO** share pays if that does not happen. In this market, the key distinction is between a real, qualifying final instrument and earlier statements, roadmaps, or draft frameworks that still leave room for further negotiation.

For context, the June 2026 diplomacy has already produced a memorandum of understanding and a 60-day negotiating window, but multiple reports stress that the harder nuclear questions were left for later talks. Reuters said on 12 June that a memorandum could be signed within days, while also noting the deal was not yet final and that the remaining period would be used to negotiate technical details.[7] Later coverage from Reuters and Al Jazeera described a roadmap towards a final deal, which is useful for reading the market because such interim texts often support higher probabilities without counting as settlement-winning agreements.[1][10]

Traders should watch for three things: a formal signing or adoption announcement, any stated extension of the negotiation period, and concrete movement on the nuclear terms that were explicitly deferred. Media reports have pointed to continued technical talks, possible IAEA involvement, and unresolved issues around enrichment, inspections, sanctions relief, and frozen assets.[1][11][16] If the parties only announce progress, a framework update, or an extension beyond the original 60-day period, that may still fall short of the market’s required final written instrument.

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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%.