Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Robinhood Prediction Markets) Pick polygram.ink (preferred broker) |
0% | 100% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
0% | 100% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Go to the live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Go to the live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Go to the live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Go to the live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| August 31 | 0% |
| August 15 | 0% |
Market context
The Strait of Hormuz only resolves **Yes** if IMF PortWatch shows a seven-day moving average of ship arrivals at **60 or above**, so the key question is whether traffic can recover to something close to pre-crisis levels before the August 2026 deadline. Current crowd pricing implies only a **9%** chance of that happening, which is consistent with the market’s broader view that the disruption has been persistent rather than a short-lived spike.
That low probability fits the historical pattern in comparable Hormuz contracts: traders have repeatedly pushed out the expected normalisation date as tensions and shipping frictions have lingered. CNBC reported in July that Kalshi traders priced only a **43%** chance of normal traffic returning by 1 December, while Polymarket was somewhat more optimistic at **59%** by year-end, both using the same IMF PortWatch threshold; earlier in the spring, those markets had assigned materially higher odds before successive drawdowns in sentiment.[1][3][4] Reuters-style market framing has also emphasised how difficult it is to get back above the 60-ship benchmark once flows have been disrupted, because the contract measures a *moving average* rather than a one-day rebound.[2][7]
For traders, the main catalysts are not just headlines about Iran, the U.S. or shipping security, but any operational evidence that traffic is clearing enough to lift the seven-day average. Watch IMF PortWatch updates, tanker routing decisions, any renewed attack or escort announcements, and weekly shipping data that can move the average quickly if several vessel classes resume transit at once.[1][2][6] On platform mechanics, Polymarket prices this as a simple percentage, while Kalshi typically shows a contract price that translates into implied probability; Betfair and Smarkets usually quote decimal-style back/lay markets, with liquidity and fees differing by venue, and KYC access is also more restrictive on US-regulated platforms than on offshore-style crypto markets.
Methodology
We read Strait of Hormuz traffic returns to normal by 2026? 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
- 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 is accessible globally?
- Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.
- 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.
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