Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via PolyGram) Pick polygram.ink (preferred broker) |
18% | 82% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
18% | 82% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Trade this market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Trade this market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Trade this market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Trade this market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| US | 18% |
| UK | 8% |
| France | 8% |
| Germany | 8% |
| Netherlands | 5% |
| Italy | 5% |
| Greece | 3% |
| Australia | 1% |
Market context
Polymarket prices this contract at **8% YES** today, which signals traders see a warship transit by a listed country as possible but still unlikely before 31 August. On-chain, that view sits in the usual Polymarket stack: users trade **USDC** on **Polygon**, with the event resolved through the market’s conditional-token framework if a national government, its military, or broad credible reporting confirms a qualifying transit.
The main comparator is the run of Hormuz-related naval activity already seen this year. Reuters reported in March that Donald Trump said “many countries” would send warships to keep the strait open, while later reporting and regional coverage pointed to European and Asian vessels moving into or around the area as tensions rose.[6][4][14] That matters because this market is not asking whether the Strait of Hormuz is militarised in general; it needs a specific country’s **warship** to transit the strait during the window. The earlier April Polymarket on the same theme eventually resolved **No**, despite strong headlines around U.S. and allied naval activity, which is a useful reminder that rhetoric and deployments do not always translate into a confirmed transit for each country.[10]
Traders should watch for official naval tasking, escort announcements, and media reports naming hulls and routes. Recent reporting says European countries were preparing to dispatch vessels only once ceasefire conditions held, with Britain already having sent the destroyer *Dragon* to the area and France’s carrier positioned within a few days’ sailing distance.[2] Reuters also reported in late June that Iran, Oman and the IMO were shaping a new shipping arrangement and that traffic had begun to recover, which could reduce the need for fresh warship transits even as IRGC warnings kept the route politically sensitive.[16][17]
Methodology
This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.
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.
UK Frequently Asked Questions
- 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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- Is this market available outside the US?
- Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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