Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Legal UK) Pick polygram.ink (preferred broker) |
98% | 2% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
98% | 2% | 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 |
|---|---|
| 27°C | 98% |
| 28°C | 3% |
| 29°C | 1% |
| 24°C or below | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C or higher | 0% |
Market context
Hong Kong’s hottest reading on 31 July will be set by the Hong Kong Observatory’s published **Absolute Daily Max** for the day, which is the figure this market uses for settlement. The city’s July climate profile makes a low-teens or even upper-30s outcome plausible in some years, but the observatory’s July records show the monthly maximum has reached **35.7°C** and **35.6°C** in past Julys, while a separate 2023 July report recorded **36.1°C** at the observatory on 27 July during an especially hot spell.[3][8]
The current **0% YES** crowd price reads as a hard scepticism about a top-end outcome, but that level often reflects market caution rather than a meteorological forecast. Comparable Hong Kong summer cases show how quickly the city can swing between ordinary 31–33°C afternoons and exceptional spikes above 35°C when heat, sunshine and local terrain align; recent reporting also shows the Observatory has already logged highs around **31.6°C** and **31°C** in other years, with parts of the New Territories running hotter than the city-centre station.[5][12]
For accessibility, the market sits within the usual prediction-market compliance layer rather than a pure weather bet: German **GlüStV** rules can affect whether participation is classed as gambling and therefore restricted for users in Germany, while the **US CFTC** position matters because event-contract venues can face US regulatory scrutiny if they serve American users or markets deemed to fall within commodity-event jurisdiction. A stated **“no-KYC up to $1,500”** threshold generally means smaller positions may be opened without full identity verification, which lowers friction for casual access but does not remove jurisdictional limits, sanctions screening, or platform-specific withdrawal controls.
Methodology
This overview of Highest temperature in Hong Kong on July 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.
FAQ
- 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 Legal UK has a different geo footprint.
- Do I need to KYC for Polymarket Legal 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.
- How are winnings taxed?
- Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.
- What happens during a tax audit?
- You're responsible for documenting your trades. Polymarket Legal UK exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Polymarket Legal UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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