Strait of Hormuz traffic returns to normal by September 30?

Platform comparison

Market context

Commercial shipping through the Strait of Hormuz is still running below normal after the 2026 disruption, and the market only pays out if IMF Portwatch’s 7-day average of ship arrivals gets back to at least 60 before 30 September. That makes the key question less about headlines alone and more about whether the transit count can stay elevated for long enough to lift the moving average, which is the sort of condition a power-user would track programmatically rather than manually.

The current 22% YES price sits between earlier reports of near-standstill traffic and later signs of partial recovery. Reuters said on 9 April that flows were at less than 10% of typical volumes, while reporting in June described ships “trickling through” after a preliminary U.S.-Iran deal, but still far below pre-war levels.[6][9] That pattern matters because the market is not settled by a one-off convoy or a short-lived spike; insurers, carriers, and route planners need sustained normalisation, and prior commentary suggested clearing backlog and restoring confidence could take weeks rather than days.[2][4]

A trader watching this programmatically would focus on three inputs: the Portwatch series itself, the cadence of diplomatic implementation, and any new security shock that can knock traffic back below the threshold. Reuters and other recent coverage pointed to a fragile ceasefire framework, mine-clearing requirements, and the risk that renewed attacks could interrupt the rebound.[9][11] In practice, that means monitoring automated alerts for daily arrivals, not just oil headlines, because the market resolves on the published 7-day moving average rather than on subjective assessments of “normal” traffic.

Sources: 1 · 2 · 3 · 4 · 5

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.

FAQ

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 Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Review UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.