Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Legal UK) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
100% | 0% | 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 |
|---|---|
| 33°C | 100% |
| 27°C or below | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 36°C | 0% |
| 37°C or higher | 0% |
Market context
Guangzhou’s high on 31 July will be set by the hottest reading at Guangzhou Baiyun International Airport, so the market is really about whether the day reaches the upper end of the city’s late-July range rather than whether it merely stays hot. Live and forecast sources point to a warm, humid pattern: current and near-term readings around 28–30°C, with forecast highs clustered near 31–37°C and thunderstorms or showers possible.[4][5][7]
The present **0% YES** crowd view looks hard to justify against the seasonal record. July in Guangzhou is typically among the hottest months, with average highs around 30–33°C and occasional peaks close to 36–37°C; one climatology source also notes daily highs in July are “around 91°F” and rarely exceed 96°F, while another says 31 July is one of the shortest days of the month, underlining that the event sits deep in the summer weather regime.[1][3][11][13][17][19] Comparable warm-season weather in the city often produces airport highs in the low-to-mid 30s Celsius, which means a “no” outcome is not the obvious baseline if the forecast verifies.[1][3][7]
For accessibility, the relevant legal framing is operational rather than advice: markets available with *no-KYC up to $1,500* are typically the most straightforward entry point for smaller positions, but that cap matters if a trader wants to scale exposure beyond the threshold. German GlüStV issues are relevant because the Staatsvertrag regime can treat online betting-style activity and its promotion more restrictively than some other jurisdictions, while US CFTC reach is relevant because US persons can face derivatives-style regulatory scrutiny depending on how a market is characterised and offered. For this specific market, the key catalysts are the morning and early-afternoon weather evolution in Guangzhou, especially whether thunderstorms, rain bands or delayed heating suppress the airport’s maximum before the 12:00 UTC settlement window closes; any update in the station’s observed high on Wunderground is what ultimately matters.
Methodology
This overview of Highest temperature in Guangzhou 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
- 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. 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.
- 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.
- 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.
- 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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