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

Platform comparison

Market context

The main thing to watch is whether any government actually sends a military vessel through the Strait of Hormuz before the deadline, not whether officials talk about escort plans. The market has been anchored by a low-probability backdrop: credible reporting in March said no country had publicly committed to deploying warships, even as the US urged allies to help secure the route, and later reports in June and July described the corridor as still fragile, with UN escort efforts halted after renewed incidents and Iran again warning over unauthorised traffic.[11][15][17][18][19]

History points to a market that can move on announcements but still finish at “No” unless a transit is formally confirmed. In March, several outlets reported that Japan, EU officials and others were cautious or had no plan to alter naval posture, while other reports noted limited special clearances for commercial traffic rather than warship movements.[4][10][19] For a prediction market comparison, Polymarket and similar crypto-native books typically show this as an implied probability, so 8% means about an eight-in-a-hundred chance; Kalshi and Betfair-style venues instead quote prices in dollars or decimal odds, while fees and KYC can differ materially, which affects the effective breakeven even when the headline probability looks similar.

The catalysts are straightforward: an official defence ministry statement, a naval deployment schedule, or a credible wire report saying a named country’s warship crossed the strait. Reuters reported in late June that traffic had normalised somewhat as the US tried to reassure Gulf partners, but that does not equal a qualifying warship transit.[17] BBC and other recent coverage also show allied governments still discussing rather than committing, which keeps this market sensitive to a single confirmed passage rather than to broader regional tension.[4][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Which countries will send warships through the Strait of Hormuz by August 31? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

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.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

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. Polymarket Alternative 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.