Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Tax 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 |
|---|---|
| 35°C | 100% |
| 28°C or below | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 36°C | 0% |
| 37°C | 0% |
| 38°C or higher | 0% |
Market context
Guangzhou’s result depends on the highest temperature logged at Baiyun International Airport on 5 August, and the public forecast backdrop is for a hot, humid day with a chance of rain rather than an easy, one-way heat spike. Recent guidance for early August points to daytime highs around 33–36°C, with several sources showing Guangzhou’s August norms in the low 30s and frequent afternoon showers that can interrupt peak heating.[1][2][13][16]
That context explains why the current 0% YES pricing should be read as an extreme market view, not a statement that the event is impossible. Comparable Guangzhou summer markets usually cluster around the mid-30s because subtropical monsoon humidity, cloud build-up and convective rain often limit upside, while urban heat and clear breaks can still produce a brief spike; the Polymarket listing itself has described a tight range around 34–35°C with 36°C as residual tail risk.[6][14][20]
For accessibility and compliance, this is the kind of weather market that can sit inside broader crypto-prediction-market rules without changing the underlying settlement source: the key question is the airport-observed maximum, not an official citywide forecast. A German reader still has to think about GlüStV restrictions on unauthorised gambling products, while US-facing participation remains sensitive to the CFTC’s jurisdictional reach if a market is deemed a regulated derivatives venue. “No-KYC up to $1,500” generally means lighter onboarding for small positions, but it does not remove sanctions screening, geo-blocking or identity checks once activity crosses the platform’s threshold.
Methodology
This overview of Highest temperature in Guangzhou on August 5? 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.
- What happens during a tax audit?
- You're responsible for documenting your trades. Polymarket Tax 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.
- 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 Tax UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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