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

Platform comparison

Market context

The Strait of Hormuz, a 54-nautical-mile waterway between Iran and Oman, handles roughly one-third of global seaborne oil trade. The question of whether non-regional military powers will deploy warships through this chokepoint by mid-2026 hinges on geopolitical escalation, freedom-of-navigation operations, and Iran's willingness to permit or contest such passages. Current crowd pricing at 4% implies extremely low conviction that any nation will execute a warship transit during the settlement window—a threshold that reflects either confidence in regional stability or underestimation of operational likelihood.

Historical precedent suggests the probability warrants scrutiny. The US Navy has conducted multiple freedom-of-navigation operations through the Strait since 2019, including destroyer and carrier strike group transits, though these typically occur without formal Iranian interdiction. European navies, particularly the French and British, have also routed vessels through the passage during counter-piracy and regional security missions. The 4% crowd estimate appears to price in a scenario where no new transits occur—a bet on either continued US restraint, absence of allied operations, or Iranian acquiescence to existing patterns without escalation.

Traders should monitor Iranian military announcements, US Central Command deployment schedules, and any escalation in regional tensions tied to sanctions or nuclear negotiations. Recent reporting from Reuters and regional defence ministries will signal intent. Across platforms, Polymarket's current decimal odds (approximately 1.04) diverge meaningfully from Kalshi's equivalent payout structure; Betfair and Smarkets typically show tighter spreads on geopolitical events once liquidity pools form. The low probability reflects genuine uncertainty rather than consensus dismissal, making this a market sensitive to single catalytic events.

Methodology

This page compares Which countries will send warships through the Strait of Hormuz by July 31? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.