Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
51% | 49% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
51% | 49% | 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 |
|---|---|
| 31°C | 51% |
| 30°C | 47% |
| 32°C | 1% |
| 33°C or higher | 1% |
| 23°C or below | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
Market context
The event is the **highest airport temperature in Shenzhen on 2 August**, measured at Shenzhen Bao’an International Airport, with settlement tied to the day’s top Celsius reading rather than the average or the forecast high. August in Shenzhen is typically very warm and humid, with broad climatology putting daily highs around 32°C to 32.5°C and frequent rain, so the market is really about whether the airport clears the usual low-30s band or prints an outlier peak. [2][4][10]
A 0% crowd-implied probability is best read as a thin-liquidity starting point, not a meteorological statement. Comparable Shenzhen August climate pages show typical highs near 31–32°C, but also indicate that individual days can reach the mid-30s Celsius, while one historical guide cites a record August temperature of 103°F in the city, underscoring that extreme spikes are possible even if not common. [4][5][9][20]
For accessibility, the regulatory frame matters more than the weather map. Under Germany’s GlüStV regime, many online betting-style products can face strict licensing and geofencing constraints, so German access can be materially limited depending on venue structure and local compliance. In the US, CFTC reach is the key question for event contracts touching weather, because whether a market is offered lawfully to US users depends on the platform’s regulatory status and product design; “no-KYC up to $1,500” generally means a user may be able to trade up to that cumulative level without identity verification, which can make smaller positions easier to place but does not remove jurisdictional or sanctions screening limits.
Methodology
This overview of Highest temperature in Shenzhen on August 2? 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.
- 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.
- 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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