Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Kalshi UK) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| July 24 | 100% |
| August 4 | 100% |
| August 19 | 11% |
| August 16 | 9% |
| August 12 | 8% |
| August 13 | 8% |
| August 14 | 8% |
| August 26 | 8% |
| August 31 | 8% |
| August 18 | 7% |
| August 20 | 7% |
| August 23 | 7% |
| August 25 | 7% |
| August 27 | 7% |
| August 29 | 7% |
| August 30 | 7% |
| August 15 | 6% |
| August 17 | 6% |
| August 22 | 6% |
| August 28 | 6% |
| August 10 | 5% |
| August 24 | 5% |
| August 11 | 4% |
| August 21 | 4% |
| August 5 | 1% |
| August 8 | 1% |
| August 9 | 1% |
| July 25 | 0% |
| July 26 | 0% |
| July 27 | 0% |
| July 28 | 0% |
| July 29 | 0% |
| July 30 | 0% |
| July 31 | 0% |
| August 1 | 0% |
| August 2 | 0% |
| August 3 | 0% |
| August 6 | 0% |
| August 7 | 0% |
Market context
Polymarket is pricing this contract at **100% YES** in USDC terms on Polygon, so the market is effectively saying a qualifying Houthi strike or seizure of a commercial ship before 31 August is already treated as a near-certain outcome. Because settlement uses conditional tokens, the main practical risk for holders is not price discovery but whether any reported incident matches the market’s fairly narrow rules: the vessel must be commercial, the action must be kinetic or a forcible boarding, and intercepted missiles or drones do not count.
That reading sits against a two-year pattern in which the Houthis have repeatedly used drones, missiles and small-boat tactics against commercial shipping in the Red Sea and Bab el-Mandeb, including dozens of attacks since late 2023 and a recent spate of claims against Saudi-linked tankers.[18][7][3] Reuters reported on 22 July that the Houthis claimed strikes on two Saudi oil tankers and said they had deployed missiles and drones near the key corridor, while other reports said shipping traffic through Bab el-Mandeb fell afterwards.[8][5] For a trader, the market’s 100% print reflects how quickly this pattern can recur once a blockade threat or shipping warning is issued.
The main catalysts to watch are Houthi statements, maritime security advisories, and routing changes affecting Saudi-linked or Red Sea transits, especially around Bab el-Mandeb and the southern Red Sea.[14][3] Reuters also reported on 16 July that Iran had asked the Houthis to stand ready to close the route if the US struck Iranian power infrastructure, which matters because escalation in one theatre can quickly spill into shipping risk.[13] In practice, any fresh claim, escort warning or vessel tracking disruption is likely to matter more than general geopolitical noise, because the settlement question turns on a specific qualifying incident rather than the broader oil-market backdrop.
Methodology
We track Houthis successfully target shipping on 2026? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.
Resolution & payout
Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.
Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.
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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- 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.
- 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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