Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
45% | 55% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
45% | 55% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Market context
The Strait of Hormuz remains a live test of whether disrupted shipping can stabilise enough for IMF PortWatch’s 7-day average to get back to at least 60 recorded transit calls. That threshold matters because the contract settles on a published moving average, not on headlines or informal claims about reopening, so a brief burst of sailings only helps if it is sustained in the PortWatch series. Recent reporting has kept the corridor in view as a strategic oil chokepoint, with traffic still described as well below normal in July and early August, while the market itself prices a slightly better-than-even chance of recovery by year-end at 56% YES.[1][10][17]
The best historical guide is the post-disruption pattern seen this year: traffic fell to a trickle, then recovered only unevenly after ceasefire or reopening signals, with Reuters and other outlets showing that even when ships began moving again, volumes remained far below the roughly 60 to 130 daily transits seen before the crisis.[5][11][12][13] That makes the current probability easier to read as a bet on *persistent* normalisation rather than a one-off convoy. The contract is also on-chain in the sense that settlement is binary and USDC-denominated on the platform, so price can move quickly on fresh shipping data, not just on geopolitical news.
The main catalysts are any verified change in security conditions, mine-clearing or escort announcements, and whether commercial insurers and ship operators accept the route as usable again. Traders should watch IMF PortWatch publications for a 7-day average at or above 60, alongside Reuters or other wire updates on negotiations and vessel movements, because those are the inputs most likely to re-rate the market before year-end.[1][5][13][14] If broader risk sentiment in oil and crypto tightens at the same time, flows into BTC and ETH can also matter indirectly, as conflict-driven energy shocks often spill into macro positioning and liquidity.
Methodology
This page reads Strait of Hormuz traffic returns to normal by December 31? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
UK Frequently Asked Questions
- What are crypto prediction markets?
- Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.
- Why USDC and not ETH or USDT?
- USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.
- 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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