Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Tax UK) Pick polygram.ink (preferred broker) |
47% | 53% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
47% | 53% | 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 |
|---|---|
| 34°C | 47% |
| 35°C | 37% |
| 33°C | 15% |
| 36°C | 3% |
| 32°C | 1% |
| 30°C or below | 0% |
| 31°C | 0% |
| 37°C | 0% |
| 38°C | 0% |
| 39°C | 0% |
| 40°C or higher | 0% |
Market context
Hong Kong’s **11 August maximum temperature** is the observable that will decide this market: the Hong Kong Observatory’s final “Absolute Daily Max” for the day, published in its Daily Extract, not an implied forecast. The current **0% YES** price should be read as a market sceptical that the eventual reading will fall into the YES range, but that can change quickly once the Observatory posts the final data and any afternoon heat spike is confirmed.
Comparable Hong Kong summer cases tend to be driven by how hot the urban core gets relative to the New Territories, and by whether showers or thunderstorms cut off the day’s peak before mid-afternoon. The official forecast for 11 August called for *extremely hot* conditions with a maximum of around 35°C in urban areas and a couple of degrees higher inland, while private forecasts clustered around roughly 31–35°C highs[7][9]. That framing matters because this market resolves on the recorded peak, so even a brief surge can decide the band. For context, August in Hong Kong is normally hot and humid, with many services showing highs in the low- to mid-30s Celsius[5][8].
For accessibility, “**no-KYC up to $1,500**” means a trader can typically gain limited exposure without submitting identity documents until activity or balance thresholds are crossed; it is an access feature, not a guarantee of anonymity, and platform limits still apply. In Germany, the GlüStV gambling framework can affect whether retail access is offered or restricted, while the US CFTC’s reach matters because federally regulated derivatives-style products may be unavailable or limited to US persons depending on venue structure. For this market specifically, the practical catalysts are the Observatory’s hourly updates, any thunderstorm or rain warnings, and the release of the final Daily Extract after the day ends, which is the settlement source rather than third-party weather apps[9][11].
Methodology
This overview of Highest temperature in Hong Kong on August 11? 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
- Is Polymarket legal in my country?
- Polymarket is geo-blocked in the US/UK/EU. Actual usage via the Polymarket interface is not possible there. The legal status itself varies — many countries treat prediction markets as a gray area. Polymarket Tax UK has a different geo footprint.
- 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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