Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
22% | 78% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
22% | 78% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| December 31 | 22% |
| October 31 | 16% |
| August 31 | 1% |
| July 31 | 0% |
Market context
The IAEA has not conducted in-person inspections at Iran's three primary enrichment and research sites—Isfahan, Fordow, and Natanz—since 2015, when the Joint Comprehensive Plan of Action (JCPOA) was signed. Access to these facilities was negotiated as part of that agreement, but inspections ceased after the United States withdrew in 2018 and Iran subsequently suspended cooperation with the agency's monitoring protocols. The current 0% implied probability reflects the absence of any active diplomatic framework permitting such visits, coupled with Iran's stated position that inspections remain contingent on sanctions relief and renewed compliance negotiations.
Historical precedent suggests IAEA access depends entirely on bilateral agreement rather than unilateral agency authority. Between 2015 and 2018, IAEA Director General Yukiya Amano conducted regular inspections under JCPOA terms, establishing a baseline for what formal access looks like. The agency's ability to visit these sites has been a flashpoint in every subsequent negotiation cycle, including the failed 2021–2022 talks in Vienna. Iran has used inspection access as a bargaining chip, conditioning resumption on Western concessions.
Traders monitoring this market should track announcements from the IAEA, Iranian government statements, and multilateral negotiations involving the European Union and United States. Any renewal of talks aimed at a new nuclear accord, or a shift in Iran's official stance on inspector access, would constitute a material catalyst. Recent reporting from Reuters and AFP on Vienna negotiations provides real-time signals; funding and whale flows on this contract will likely spike only if credible news emerges of imminent diplomatic breakthrough or formal inspection scheduling.
Methodology
This page reads IAEA visits Isfahan, Fordow, or Natanz nuclear site by 2026? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
UK Frequently Asked Questions
- What are crypto prediction markets?
- Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.
- What does a transaction cost on Polygon?
- Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.
- 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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