Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
100% | 0% | 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 |
|---|---|
| 34°C | 100% |
| 27°C or below | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 35°C | 0% |
| 36°C | 0% |
| 37°C or higher | 0% |
Market context
The real-world event hinges on the highest temperature recorded at Beijing Capital International Airport on 28 June 2026, measured in degrees Celsius. Historical patterns for Beijing in June show daytime highs typically ranging between 25°C and 35°C, with frequent days exceeding 30°C unless cold air intrudes [2][5][6]. Recent extreme heat events, such as the record third day above 40°C in June 2023, demonstrate that temperatures can spike well beyond the average [9]. Given that the market currently assigns a 100% probability to 34°C and a 0% chance to 27°C or below, the crowd-implied 0% YES probability for lower ranges aligns with the region’s consistent summer warmth and the absence of recent cooling trends [1][2].
Traders should monitor official weather bulletins from the China Meteorological Administration for any announcements of cold air fronts or heatwave warnings, as these are the primary catalysts that could shift temperature outcomes [5]. The settlement window closes at 12:00 UTC on 28 June 2026, meaning real-time Wunderground data for the Beijing Capital International Airport Station will be the definitive resolution source [1]. Regulatory frameworks also shape accessibility: German GlüStV implications may restrict participation for residents in certain states, while US CFTC reach applies to markets deemed as gambling or unregistered derivatives [1]. Crucially, the “no-KYC up to $1,500” threshold allows traders to access this market without identity verification for smaller positions, enhancing liquidity for retail participants who wish to bet on the 34°C outcome without triggering compliance hurdles [1].
Methodology
This overview of Highest temperature in Beijing on June 28? 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.
- What happens during a tax audit?
- You're responsible for documenting your trades. Is Kalshi Legal in California 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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