US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

Polymarket has this contract at **0% YES**, which means the market is pricing the odds of a qualifying written US-Iran nuclear instrument as effectively nil on USDC collateral via Polygon’s conditional token settlement. In practice, that makes the key question not whether talks have happened, but whether both sides have produced a document that fits the market’s rules: mutually signed or formally adopted by the deadline, not merely a roadmap, communiqué, or interim framework.

That is a much stricter bar than the diplomatic headlines suggest. Reuters reported on 15 June that the sides had agreed a preliminary framework and that a signing was planned in Switzerland, but its own wording made clear that the nuclear file would still be left to later negotiations.[10] Al Jazeera described a 60-day roadmap towards a final agreement, while CNBC and AP later characterised the arrangement as an MOU or initial deal with technical work still under way, which is useful context because many markets die on the distinction between “framework” and “final deal”.[1][5][7] Past Iran-US rounds have also produced “progress” without a binding end-state, as in Geneva in February, when officials talked up guiding principles and next steps rather than a signed nuclear accord.[3][4]

For traders, the main catalysts are any fresh announcement from Washington, Tehran, or the mediators that the June instrument has been upgraded into a final written text, plus any confirmed signing ceremony, exchange of signed copies, or official adoption without signature before 31 August. Watch for references to IAEA access, enrichment limits, sanctions relief, and whether the 60-day period is extended by mutual consent, because those details indicate whether negotiators are still inside the framework or have crossed into a settlement that could satisfy this market.[1][6][8]

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

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

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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%.