Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Legal UK) Pick polygram.ink (preferred broker) |
99% | 1% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
99% | 1% | 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 |
|---|---|
| 23°C | 99% |
| 22°C or below | 1% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C or higher | 0% |
Market context
Hong Kong’s **lowest temperature on 31 July 2026** is the event that will decide the market, using the Hong Kong Observatory’s final “Absolute Daily Min” for that date in the published Daily Extract. In practice, July in Hong Kong is normally very warm: the Observatory’s 1991–2020 normals show a mean minimum near **26.9°C to 27.0°C** around 31 July, so a settlement result will usually sit in a high-summer range rather than anywhere near cool-season levels.[6][19]
The current **1% YES** crowd price implies an outcome that the market is treating as extremely unlikely, which is consistent with Hong Kong’s climate record and recent July summaries. The Observatory’s July 2023 review described the month as exceptionally hot, with a monthly mean minimum of **28.0°C**, while noting that 31 July that year had showers and thunderstorms in the small hours before conditions improved later in the day.[8] For framing, the market should be read as a weather-data bet rather than a forecast of heat generally: the exact ticked range depends only on the Observatory’s final daily minimum reading, reported to one decimal place.[19]
Catalysts are mostly administrative rather than dramatic: the key dependency is the HKO’s publication of the relevant Daily Extract, and the market cannot resolve until that data is posted. Accessibility is shaped by market-venue rules, not by the weather itself: a **no-KYC up to $1,500** limit means small positions may be available without full identity verification, while larger or cumulative activity typically triggers KYC checks. Regulatory treatment also matters: German **GlüStV** rules can affect whether such a contract is treated as lawful gambling access in Germany, and the US **CFTC** can reach markets that fall within US derivatives jurisdiction, so availability may vary by user location and compliance profile.
Methodology
This overview of Lowest 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.
- Can I trade anonymously?
- Pseudonymously, yes — up to the KYC threshold. Polymarket Legal UK stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.
- Is there a withdrawal cap?
- No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).
- 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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