Strait of Hormuz traffic returns to normal by end of June?

Platform comparison

Market context

Ships are effectively barred from crossing the Strait of Hormuz as the US-Iran war continues, leaving the waterway at a near-standstill for weeks and sending oil prices higher[4]. Commercial traffic remains limited despite an April ceasefire, with routing uncertainty and continued attacks on vessels constraining transits to a trickle[7]. The strait is currently closed, with commercial shipping suspended after a brief reopening that was quickly reversed by Iran[3].

Historical precedents show that even after diplomatic agreements, Hormuz traffic rarely rebounds to normal levels quickly; the 8 April 2026 ceasefire failed to restore meaningful flow, and transits without AIS remain an extreme possibility[7][1]. Platforms diverge sharply here: Polymarket displays decimal odds (roughly 0.15 implied probability) with no KYC and low fees, while Kalshi requires identity verification, offers implied probability directly, and charges higher fees for institutional reach. Betfair and Smarkets similarly split between decimal odds and probability formats, with fee structures varying from 2% to 5% depending on volume.

Traders must watch the IMF PortWatch 7-day moving average threshold of 60 arrivals, the expiration of war-risk insurance cover, and any new US-Iran diplomatic announcements[6]. Recent data shows freight indices spiking as carriers push rate hikes amid missile threats, with the Baltic Exchange MidEast Gulf to China index assessed at 423,736[1]. The settlement window ends 30 June 2026, and any sustained drop in ship numbers—such as the recent 3-month decline noted in maritime reports—will keep the YES probability near its current 15% level[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Strait of Hormuz traffic returns to normal by end of June? 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 quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

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

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.

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.