Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Tax UK) Pick polygram.ink (preferred broker) |
85% | 15% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
85% | 15% | 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 | 85% |
| 34°C | 19% |
| 35°C | 1% |
| 27°C or below | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 36°C | 0% |
| 37°C or higher | 0% |
Market context
Guangzhou’s outcome hinges on the highest temperature recorded at Baiyun Airport on 31 July, with the market resolving to the Wunderground daily history entry for that station. July in Guangzhou is normally very hot and humid, with average daily highs around 91°F/33°C and only a narrow typical band either side of that, so the market is effectively testing whether the day lands near seasonal norms or produces an outlier spike.[2][3][10]
The current **0% YES** crowd price is hard to read as a temperature forecast rather than a market frictions signal. Guangzhou has a long summer heat profile, with recent July data showing highs commonly in the low 30s °C and occasional peaks in the mid-30s °C, while the broader historical record includes July extremes up to the mid-30s °C and even higher in some datasets.[3][8][16] In practice, a 0% quote can also reflect low participation, settlement uncertainty, or platform-specific access constraints rather than a strong view that the airport will stay below the relevant bracket.
For accessibility, the regulatory context matters. If the platform is run under a framework that keeps **no-KYC up to $1,500**, that usually means smaller positions can be opened with lighter identity checks, but larger activity may still trigger verification and withdrawal controls. German **GlüStV** restrictions are relevant because they can affect whether users in Germany can access or lawfully use the venue at all, while the **US CFTC** has asserted broad jurisdiction over many derivatives-style event contracts, which can limit US participation even when a market is internationally visible. Traders should watch any late-day weather shifts at Guangzhou, airport reporting updates, and the exact Wunderground high-temperature entry, because a settlement based on the station’s recorded maximum depends on the final daily observation rather than a citywide average.
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
- Do I need to KYC for Polymarket Tax 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 Tax 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 Tax UK exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- 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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