Farsi, Hengam, Hormuz or Kharg Island no longer under Iranian control by 2026?

Platform comparison

Market context

The last 24–48 hours have not produced any confirmed change in control over Farsi, Hengam, Hormuz or Kharg Island; the market is still trading on a very low probability because there is no verified report that Iran has lost primary governmental or military control of any of them. For a YES to settle, there would need to be an actual transfer of control to another state, occupying force, or internationally backed authority, not just a strike, raid, or announcement.[11]

That framing matters because the comparable cases are all about *control*, not symbolism. Farsi Island has long been an Iranian military outpost, including an IRGC Navy base, and its legal status has been recognised in past Iran–Saudi arrangements; that makes it a useful reference point for how durable island control tends to be in the Gulf.[1][2][13] Historical incidents around the island, including the 2016 detention of US sailors, showed how quickly a local maritime incident can escalate without altering sovereignty or day-to-day control.[12][14]

For traders, the near-term catalysts are concrete rather than speculative: any announcement of a negotiated transfer, a ceasefire clause covering island administration, a change in garrisoning or civil administration, or credible reporting that a foreign authority has physically established control would matter most.[11] By contrast, offshore naval activity, bombing, sabotage, temporary landings, or a statement that Iran has “lost” an island would not be enough on their own under the market’s own definition.[11] The broader strategic context remains the Strait of Hormuz, where even small islands can affect access and surveillance, but that geography by itself does not imply a control change is imminent.[15]

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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%.