Strait of Hormuz traffic returns to normal by December 31?

Platform comparison

Market context

Traffic through the Strait of Hormuz is still being judged against a hard threshold: IMF PortWatch must show a seven-day moving average of at least 60 transit calls for the market to settle Yes. That makes the current 48% crowd-implied probability broadly consistent with a genuinely mixed view, because recent reporting has described traffic as recovering only gradually after the crisis, with Reuters saying in April that volumes were still well below normal despite a ceasefire, while later coverage said ships were only “trickling through” and a return to pre-war levels could take weeks or longer.[9][10][12]

Historically, traders have treated this as a resilience-and-politics problem rather than a simple one-off shipping rebound. CNBC reported in June that Kalshi probabilities swung sharply as the timeline for normalisation moved out, while Polymarket was slightly more optimistic on the same IMF PortWatch definition, showing how different venues can price the same event at different levels even when the settlement rule is identical.[15][16][1] For platform comparison, Polymarket and Kalshi quote the outcome as an implied probability, while Betfair and Smarkets usually present decimal odds, so the same view can look narrower or wider depending on the book; fees and access also matter, with exchange-style venues typically showing commission separately and KYC reach varying by jurisdiction.

The main catalysts are diplomatic and operational: any durable Iran-U.S. or regional security deal, formal easing of shipping restrictions, mine-clearing progress, or a verified rise in daily transits could move the seven-day average towards the 60-call trigger. Reuters and later commentary point to the opposite risk as well: renewed warnings to ships, security incidents, or slow port clearance can keep flows below the line even after headlines improve.[9][12] Because the contract resolves as soon as IMF PortWatch publishes the threshold being met, traders should watch the data cadence itself, not just the politics.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Strait of Hormuz traffic returns to normal by December 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

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

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.

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.

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.

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.

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.