US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

Polymarket’s contract is still priced at **0% YES**, which means the market is treating a signed, qualifying US-Iran “final deal” by 31 August 2026 as effectively absent for now. On Polygon, buyers would be taking the other side of a binary outcome settled in USDC through conditional tokens, so the key question is not whether talks continue, but whether a **written instrument** is mutually signed or formally adopted in the market’s exact sense before the deadline.

That matters because the current dispute sits on top of an earlier framework rather than a completed settlement. Reuters reported in June that negotiators were close to a memorandum of understanding and that a signing ceremony was being discussed in Europe, while AP and Time later described an initial deal or framework followed by a 60-day negotiation period on the nuclear file and sanctions relief.[6][12][10] Earlier rounds in Geneva also produced language about “general guiding principles” and “significant progress”, but no final accord, which is why comparable episodes in 2026 have so far supported only short-dated frameworks, not a conclusive document.[2][4][9]

For traders, the immediate catalysts are procedural rather than rhetorical: any announcement of a signing date, a new round in Vienna or elsewhere, extensions to the 60-day clock, or public confirmation that the parties have actually adopted the final text. Reuters’ June reporting on a possible European signing, plus subsequent coverage that the deal would be judged by whether enrichment, inspections, frozen assets and shipping terms are all locked into a formal instrument, suggests the market will react most to document-level language, not broad claims of progress.[6][14][8]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track US-Iran Final Nuclear Deal by…? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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%.