Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
80% | 20% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
80% | 20% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Go to the live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Go to the live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Go to the live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Go to the live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 26°C | 80% |
| 27°C | 18% |
| 28°C | 3% |
| 29°C | 1% |
| 21°C or below | 0% |
| 22°C | 0% |
| 23°C | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 30°C | 0% |
| 31°C or higher | 0% |
Market context
Hong Kong’s highest temperature on 2 August will be set by the Hong Kong Observatory’s final “Absolute Daily Max (deg. C)” for that date, published in its Daily Extract, and the market will not settle until that record is available. The crowd price of **0% YES** suggests traders are currently treating an outcome that lands in the relevant winning range as highly unlikely, which is consistent with August being dominated by rain-bearing tropical weather rather than clear-sky heat spikes. Hong Kong’s observatory data is measured to one decimal place, so the settlement threshold is the exact published maximum, not an estimate or rounded city-wide headline.
The closest historical guide is Hong Kong’s summer pattern: August typically produces highs in the low 30s Celsius, but cloud, showers, and thunderstorms can suppress the day’s peak. Comparable recent reporting showed the Observatory flagging 34.6°C as the year’s hottest day so far, while earlier market commentary for this event pointed to a forecast around 27–28°C under persistent cloud and heavy showers, with the strongest disagreement centred on whether brief breaks in rain could lift the high by a single degree. In practice, the market is reading as a weather-number event, not a temperature-forecast average, so the last published Observatory maximum matters more than broader monthly climatology.
For accessibility, the main frictions are regulatory rather than meteorological. A German participant faces GlüStV issues because prediction markets can be treated as gambling products under German gambling rules, while US exposure can still matter because the CFTC has taken the position that some event contracts fall within its remit even when offered offshore. “No-KYC up to $1,500” means a user can usually access this market with lighter identity checks until cumulative activity crosses that threshold, but it does not remove platform restrictions, jurisdictional screening, or the fact that settlement depends entirely on the Observatory’s final published extract.
Methodology
This overview of Highest temperature in Hong Kong on August 2? 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. Is Kalshi Legal in California has a different geo footprint.
- 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.
- Can I trade anonymously?
- Pseudonymously, yes — up to the KYC threshold. Is Kalshi Legal in California 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.
- Are prediction markets gambling?
- Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.
- 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).
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