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

Platform comparison

Market context

The Strait of Hormuz is the real-world choke point here: after the 2026 fighting and the partial reopening of traffic, the question is whether any national navy will actually send a warship through the waterway before 31 August. The 8% crowd price implies traders think a crossing is possible, but still uncommon enough that only a narrow set of governments are likely to do it, and only if the security picture stays stable. Reuters reported in March that Donald Trump said “many countries” would send warships to help keep the strait open, while naming possible contributors including China, France, Japan, South Korea and Britain[5].

The historical template is mixed. In earlier Hormuz tensions, naval transits tended to happen either as part of coordinated escort missions or as signalling moves after escalatory announcements, rather than as routine standalone deployments. That matters because the market resolves on a confirmed military transit, not just on a pledge or on commercial shipping being protected. Recent reporting suggests the UK has already placed a Royal Navy destroyer in the area and the US and European powers have discussed defensive escort operations, which makes the catalyst more about formal orders, coalition decisions and route clearances than about battlefield movement alone[3][1].

For traders, the main watch item is whether any government turns its Hormuz security posture into an actual transit order, especially after fresh statements or multilateral coordination. Reuters and later reports indicate the most plausible names remain the UK, France and the United States, with Asian powers more likely to pursue clearance for commercial shipping than to send warships themselves[5][12]. A confirmed announcement from a defence ministry, or credible reporting that a vessel has entered and passed through the strait, would be the clearest catalyst; absent that, the market leans on speculation rather than a scheduled deployment[3][11].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Which countries will send warships through the Strait of Hormuz by August 31? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Trump Prediction provide a 0%-fee route into the same order book.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

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