Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Polymarket Legal in Canada) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open the market → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open the market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open the market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open the market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open the 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 hottest point on the day is what settles this market, and the key reference is the highest Celsius reading recorded at Guangzhou Baiyun International Airport Station by Wunderground. Current forecasts put late-July highs in the mid-30s Celsius, with AccuWeather showing 31 July around 32°C to 34°C and other services calling for roughly 34°C, thundery showers, and humid conditions, which is consistent with Guangzhou’s usual July pattern of heat plus convective rain.[1][2][3]
The 0% YES indication can be read against a market that is highly sensitive to the exact station reading rather than the city-wide feel: short-lived showers, cloud cover, or sea-breeze effects can cap the airport maximum below broader local forecasts, while clear breaks can push it into the mid-30s Celsius. July is typically Guangzhou’s hottest month, with multiple sources putting normal daytime highs around 33°C to 37°C, so this contract is more about the precise airport observation than the general climate backdrop.[11][13][18]
From a regulatory and access angle, German GlüStV issues matter because a Germany-facing platform can be treated as offering gambling-like products unless it is structured and licensed appropriately; US CFTC reach also matters where a contract is viewed as a commodity derivative or event contract with US persons in scope. “No-KYC up to $1,500” usually means a user can access the market and trade up to that cumulative limit without identity verification, after which additional checks are required, which affects how quickly smaller retail participants can reach this Guangzhou weather event.
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. Is Polymarket Legal in Canada 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. Is Polymarket Legal in Canada 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).
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