IAEA visits Isfahan, Fordow, or Natanz nuclear site by 2026?

Platform comparison

Market context

The question hinges on whether IAEA inspectors will gain physical access to three of Iran's most sensitive nuclear facilities—Isfahan, Fordow, and Natanz—by the end of 2026. This represents a significant diplomatic and technical threshold, as these sites have been central to international scrutiny of Iran's nuclear programme. Access to Fordow in particular has been contentious; the facility was not declared to the IAEA until 2009 and remains subject to restrictions under the Joint Comprehensive Plan of Action framework.

Historical precedent suggests the 0% crowd probability reflects genuine access constraints. The IAEA last conducted routine inspections at Natanz and Isfahan before Iran's February 2021 decision to restrict inspectors to declared facilities only. Fordow has seen episodic access tied to specific diplomatic agreements rather than routine inspection schedules. The agency's ability to visit depends entirely on Iranian consent and political conditions—factors that have deteriorated since the US withdrew from the JCPOA in 2018. Comparable cases show that IAEA access typically follows either formal agreements (as with the JCPOA) or crisis-driven negotiations, neither of which currently applies.

Traders monitoring this market should track announcements from the IAEA Board of Governors, statements from Iran's Atomic Energy Organisation, and any diplomatic initiatives involving European signatories to the JCPOA. Recent reporting from Reuters and AFP has emphasised Iran's continued restrictions on snap inspections. Programmatically, conditional orders keyed to IAEA press releases or Iranian government statements would capture material shifts in access conditions faster than manual monitoring.

Methodology

We track IAEA visits Isfahan, Fordow, or Natanz nuclear site by 2026? 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?

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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?

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