Which countries will send warships through the Strait of Hormuz by August 31?

Platform comparison

Market context

The key question is whether any government will publicly confirm a **warship transit** through the Strait of Hormuz before 31 August, and the market’s 8% implied probability suggests traders see that as a low-frequency event rather than a base case. At this point, cross-platform pricing appears split: Paridesk’s order book shows active interest in the US, Australia and Germany contracts, but the broader picture from public reporting is that most governments have not committed to sending naval vessels, which helps explain why prediction-market odds remain single-digit[2][3][19].

Recent history is mixed but still leans against a routine naval passage being enough to settle “Yes”. In March, Donald Trump urged allies including the UK, France, Japan, South Korea and others to send warships, yet reporting from Reuters, CNBC and NPR said responses were largely tepid, with Germany, Spain, Italy and Australia ruling out deployments or saying no request had been made[7][13][19]. By contrast, the market has also been framed by repeated Hormuz security episodes in 2026: Reuters reported on a UN-halted escort effort in June, while Reuters and the UN described renewed disruption and shipping near-standstill conditions in July, showing how quickly the situation can shift without necessarily producing fresh, named warship transits[16][17][18].

The main catalysts now are official defence announcements, coalition talks and any scheduled escorts or freedom-of-navigation deployments, especially if a state already present in the region changes posture. BBC reporting from Monday said discussions with US, European and Gulf partners were still ongoing, but no decisions had been made, which leaves the contract sensitive to a single press release or credible Reuters-style confirmation[3]. Traders should also watch whether the US, regional navies or allied governments announce protection missions in response to any renewed shipping disruption, because that would be the clearest path from rhetoric to a qualifying transit[16][17][18].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

What are the best prediction markets for UK traders in 2026?

For UKGC-regulated markets: Betfair Exchange (sports, politics) and Smarkets (sports, politics, lower commission than Betfair). For broader global event prediction: Polymarket (deepest liquidity, 0% fee, USDC settlement). For US-regulated option: Kalshi (USD, limited UK payment options). Most serious UK traders use a combination of Betfair for regulated sports and Polymarket for broader markets.