Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
65% | 35% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
65% | 35% | 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 | 65% |
| 29°C | 35% |
| 30°C | 3% |
| 31°C | 1% |
| 23°C or below | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 32°C | 0% |
| 33°C or higher | 0% |
Market context
Shanghai’s highest temperature on 10 August will be set by a single station reading at Pudong International Airport, then mapped into the market’s Celsius range from Weather Underground’s Daily Observations table rather than the Day High & Low summary. In practical terms, this makes the outcome dependent on the exact peak observed during the day, not on a rounded headline figure, and it can differ from city-wide weather summaries that traders may see elsewhere.[9][17]
The current 0% implied probability is best read against Shanghai’s August climatology, where average highs sit around 32–33°C and hot days above that are common. Historical August references show frequent upper-30s or low-40s Celsius extremes in the city, while recent forecast pages have already pointed to 35–36°C-type highs around 10 August, suggesting the market is pricing in neither an anomalously cool nor especially hot outcome yet.[1][6][15] For accessibility, “no-KYC up to $1,500” means a user can typically interact without identity verification until cumulative activity or withdrawals exceed that cap, after which verification is triggered; that affects who can enter quickly, but not how the temperature settles. Germany’s GlüStV framework can still matter because prediction markets may be treated differently from ordinary financial trading under local gambling rules, while US CFTC reach is relevant if a venue’s event contracts are deemed to fall within commodity derivatives oversight.
For traders, the main catalysts are mundane but decisive: the actual hourly observations from early morning through afternoon, any typhoon-related rain bands or cloud cover that suppress the peak, and whether the Pudong station prints a late-day maximum after the usual midday warmth. Time and Date’s current Shanghai forecast has already flagged very high rain chances and strong humidity for 10 August, while Weather Underground’s own historical pages for Shanghai remain the settlement source, so any discrepancy between forecast products and the station log matters only insofar as it changes that logged maximum.[14][9]
Methodology
This overview of Highest temperature in Shanghai on August 10? 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 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.
- 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 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.
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Is Kalshi Legal in California would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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