Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
89% | 11% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
89% | 11% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 31°C | 89% |
| 32°C | 13% |
| 23°C or below | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 33°C or higher | 0% |
Market context
Shenzhen’s airport temperature on 1 August is usually shaped by a very hot, humid monsoon climate, with late-summer daily highs typically clustering around 32–33°C and August records showing the city can still spike much higher when heat builds under weak cloud cover.[4][5][8][16] For this market, the key question is not the daily average but the highest reading logged at Shenzhen Bao’an International Airport before the settlement window closes at 12:00 UTC, which means the value can still be set by a late-morning rise even if the day begins warm rather than exceptional.
The current 0% YES price looks anchored to the fact that Shenzhen’s August heat is persistent but not necessarily extreme on every date: historical August averages sit near the low 30s Celsius, while comparable reference series show record highs around 38–40°C for the month, implying that only a strong heat event would push the reading into the upper tail.[1][4][7][8][16] In other words, the market is pricing a specific airport-station outcome, not generic Shenzhen weather, and that distinction matters because coastal cloud, rainfall and sea-breeze effects can cap the day’s maximum even when regional forecasts look hot.[8][18][19]
Traders should watch the short-range forecast for southern Guangdong, especially any typhoon-adjacent rain bands or convection that can suppress daytime maxima, because August in Shenzhen has a high rainfall load and a material storm risk.[1][17][18][19] On-chain, this is a simple USDC-settled weather contract, so the main market signal is the crowd’s re-pricing as forecasts firm up; if broader crypto risk sentiment shifts at the same time, BTC and ETH volatility can affect liquidity and fill quality, but they do not change the underlying weather settlement itself.
Methodology
This page reads Highest temperature in Shenzhen on August 1? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
FAQ
- What are crypto prediction markets?
- Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.
- Why USDC and not ETH or USDT?
- USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.
- How volatile are crypto prediction markets?
- Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.
- Which crypto markets exist on Polymarket?
- Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.
- Are crypto prediction markets taxable in the US?
- In the US, prediction market gains are typically treated as ordinary income or short-term capital gains depending on holding period. Consult a tax professional for your specific situation — we cannot provide tax advice.
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