Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
10% | 90% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
10% | 90% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| December 31 | 10% |
| November 30 | 8% |
| October 31 | 5% |
| September 30 | 3% |
| August 31 | 1% |
| June 30 | 0% |
| July 31 | 0% |
| August 13 | 0% |
| August 18 | 0% |
Market context
The real-world event behind this market is the June 2026 US-Iran framework that opened a 60-day negotiating period, but the key question is whether that process produces a **final written instrument** by 31 August. Reuters reported that the initial memorandum was only a preliminary pact, with the nuclear file left for further negotiations and a signing ceremony still being discussed in Europe at the time[7][10]. That makes the current 0% implied probability easy to understand: the market is not pricing a completed end-state, only an interim framework.
Comparable Iran-US talks show why traders should be cautious about reading progress as completion. In February, officials described the Geneva round as “more productive” and agreed guiding principles, yet the talks still ended with “numerous details” unresolved and a later round required[3][6]. Earlier rounds also finished without a deal announced[8], while later reporting suggested the June memorandum was still an interim arrangement focused on access, sanctions and enrichment rather than a settled final accord[9][12]. In other words, this track record favours slow, procedural progress over a clean signed conclusion.
The main catalysts now are formal follow-up meetings, any public release of draft text, and whether both sides move from technical talks to a ratifiable instrument before the deadline. Reuters said the deal’s fate would turn on the months after the initial signing, with technical negotiations still needed on the nuclear provisions[7][10]. Watch for statements from Washington, Tehran, Qatar or Oman on the next round, plus any confirmation from the IAEA on inspection access, because those are the kinds of developments that would signal whether the framework is being converted into a qualifying signed agreement[9][2].
Methodology
Sports-specific comparison page for US-Iran Final Nuclear Deal by…?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.
Resolution & payout
Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.
UK Frequently Asked Questions
- Are prediction markets better than sports betting?
- Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.
- When do sports markets resolve?
- Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.
- 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%.
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