Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Tax UK) Pick polygram.ink (preferred broker) |
45% | 55% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
45% | 55% | 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 → |
Market context
Traffic through the Strait of Hormuz is effectively a question of whether commercial shipping can sustain a 7-day average of at least 60 arrivals under IMF PortWatch before year-end. That matters because the market’s trigger is mechanical: one qualifying PortWatch print is enough, and anything not captured by IMF reporting does not count. The current 60% YES price sits near the threshold between a gradual normalisation view and a longer disruption scenario.
That level is best read against the recent history of extreme volatility in the corridor. Reuters reported in April that traffic was still at less than 10% of typical volumes, with only seven vessels crossing in 24 hours versus a normal flow of around 140, underscoring how far the strait was from the contract’s benchmark.[15] By early July, CNBC said Kalshi traders were still assigning only a 43% chance of normal traffic by 1 December, while Polymarket traders were slightly more optimistic at 59% for 31 December, using the same PortWatch-style definition.[1] Those comparisons suggest the market has recently priced a meaningful recovery, but not a clean return to pre-crisis throughput.
For traders, the main catalysts are any ceasefire or security announcements affecting Gulf shipping, plus the pace at which vessel owners actually reroute back through the strait rather than waiting on the sidelines. PortWatch updates are the decisive dependency, so the key watchpoint is not just headlines but whether the published 7-day average breaks 60 and stays there. On accessibility, Germany’s GlüStV framework can make local access and participation more restrictive than in lightly regulated venues, while US CFTC reach remains relevant where a market is viewed as involving commodity or derivatives exposure. If a venue advertises “no-KYC up to $1,500”, that usually means smaller trades can be funded with limited identity checks, but higher limits, withdrawals, or compliance reviews may still trigger full verification, which affects how easily users can enter or scale exposure in this market.
Methodology
This overview of Strait of Hormuz traffic returns to normal by December 31? reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.
Resolution & payout
On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.
UK Frequently Asked Questions
- Do I need to KYC for Polymarket Tax UK?
- Not for lifetime trading volume under $1,500. Above that threshold, a quick KYC flow kicks in — ID, selfie, approximately 5-10 minutes. The threshold matches FATF travel standards for unregulated crypto platforms.
- Is Polymarket regulated by the UKGC?
- No. Polymarket is not licensed by the UK Gambling Commission (UKGC). It is a decentralised prediction market operated under US regulation. UK traders can use it but do not benefit from UKGC dispute resolution or player protection requirements.
- What are the HMRC tax rules on Polymarket profits for UK traders?
- Polymarket profits are treated as cryptocurrency disposal events by HMRC. Each USDC settlement is a taxable event subject to Capital Gains Tax (CGT). For 2026/27, the CGT rate is 18% (basic rate) or 24% (higher rate). The annual CGT exemption is £3,000. Report via HMRC Self Assessment if your total crypto gains exceed £3,000 or proceeds exceed £50,000.
- Does Polymarket KYC apply to UK users?
- Yes. Polymarket requires KYC (Know Your Customer) verification for all users, including UK residents. You must provide a government-issued photo ID and a selfie. The process typically takes 5–10 minutes via their ID verification provider.
- What is the legal difference between Polymarket and Betfair Exchange for UK traders?
- Betfair Exchange is UKGC-licensed, meaning UK consumer protections apply and winnings are typically tax-free. Polymarket is not UKGC-licensed — it operates under decentralised blockchain rules. Profits from Polymarket are subject to HMRC CGT as crypto disposals. Choose based on your regulatory preference and tax situation.
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