Strait of Hormuz traffic returns to normal by September 15?

Platform comparison

Market context

Shipping traffic through the Strait of Hormuz remains severely disrupted by Houthi attacks on vessels and regional tensions, with daily transit calls running well below the 60-vessel threshold required for market resolution. The 7-day moving average has hovered between 20 and 35 transits since escalations began in late 2023, reflecting a structural shift in routing patterns as shipping companies divert around the Cape of Good Hope despite longer transit times and higher fuel costs. No material change in attack frequency or regional security posture has emerged in the past 48 hours to suggest an imminent normalisation.

Historical precedent offers limited comfort for the 8% YES probability. The 2022 Russia-Ukraine disruption saw Black Sea grain corridor closures resolve within months once diplomatic channels opened, but the Hormuz situation involves multiple state and non-state actors with competing strategic interests. The 2019 tanker attacks similarly persisted for extended periods before de-escalation. Current Houthi operations show no signs of diminishing; the group has demonstrated sustained capability and stated intent to continue disruptions linked to Gaza-related grievances.

Traders should monitor announcements from the International Maritime Organization regarding revised threat assessments, any breakthrough in Yemen peace negotiations, or shifts in US naval posture in the region. The IMF Portwatch data itself lags real-time conditions by several days, meaning resolution would only occur after sustained normalisation has already begun. Without a major geopolitical shift, the probability of reaching 60 daily transits by mid-September 2026 remains structurally constrained.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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%.