Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
98% | 2% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
98% | 2% | 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 |
|---|---|
| 28°C | 98% |
| 29°C | 2% |
| 30°C | 1% |
| 24°C or below | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C or higher | 0% |
Market context
On 14 August 2026, Shanghai Pudong International Airport Station will record a daily high temperature in Celsius. This market resolves to whichever temperature band contains the maximum reading logged in Weather Underground's Daily Observations table—the primary source in case of any variance with the Day High & Low summary. The 0% crowd probability reflects the market's nascent state rather than meteorological certainty; August in Shanghai typically peaks between 32–35°C, with occasional excursions toward 36–37°C during heat waves.
Historical August temperature data from Shanghai shows considerable year-to-year variation. The city's record August high stands at 40.9°C (2013), though readings above 38°C occur roughly once per decade. Comparable markets on extreme heat events in East Asia have resolved across the full range of temperature bands when opened well in advance, suggesting that long-dated weather markets initially show depressed probabilities for higher thresholds simply because uncertainty compounds over months. Recent summers (2022–2024) saw Shanghai experience multiple days above 35°C, establishing a baseline for elevated outcomes.
From a regulatory standpoint, this market operates under different jurisdictional frameworks depending on trader location. German traders fall under GlüStV (Glücksspielstaatsvertrag) oversight, which classifies prediction markets as gaming contracts subject to licensing requirements. US CFTC reach extends to US persons trading on unregistered platforms, though enforcement typically targets operators rather than retail participants. The "no-KYC up to $1,500" threshold common in prediction markets means traders can access this Shanghai temperature market without identity verification provided their account balance or single trade size remains below that limit—a practical accessibility point that varies by platform jurisdiction.
Methodology
This overview of Highest temperature in Shanghai on August 14? 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.
- Do I need to KYC for Is Kalshi Legal in California?
- 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. 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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