Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Best Prediction Markets UK) Pick polygram.ink (preferred broker) |
50% | 50% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | View on Polymarket → |
Polymarket (direct) polymarket.com |
50% | 50% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | View on Polymarket → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | View on Polymarket → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | View on Polymarket → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | View on Polymarket → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| August 31 | 50% |
| July 31 | 34% |
| July 17 | 2% |
Market context
Houthi forces have already sunk multiple commercial cargo vessels in the Red Sea, with two ships destroyed in July 2025 marking a significant escalation after a seven-month lull [4][11]. Despite over 300 attempted attacks since late 2023, only 48 were successful, and the group has sunk just two ships overall while causing four sailor fatalities [2]. This historical record of low success rates against heavily defended commercial routes explains the current 2% crowd-implied probability on best-prediction-markets.co.uk, which sits far below the aggressive lines often seen in sportsbooks for similar geopolitical events and contrasts with analyst consensus that views further kinetic strikes as increasingly unlikely due to intensified US-UK naval interdiction [2][12].
Traders should monitor announcements regarding Iranian weapons shipments and Houthi drone-factory expansions, as Iran has enabled the group to build domestic drone production capabilities and smuggle cruise and ballistic missiles [5][6]. A key catalyst is the scheduled activity of the twenty-country naval task force protecting the Gulf of Aden, which has already bombed over sixty Houthi targets and will continue strikes “as necessary” to protect commerce [12]. Any sudden withdrawal of these naval assets or a new announcement of Houthi restrictions on shipping, as seen in their past campaign phases, would signal a shift in operational capacity [7]. The settlement window extends to August 2026, meaning traders must weigh the likelihood of a rare successful strike against the sustained pressure from international naval forces.
Methodology
Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.
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.
FAQ
- 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.
- 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.
- What does Polymarket cost to trade?
- Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.
- How fast are USDC deposits?
- Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within 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.
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