Highest temperature in Shanghai on June 21?

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Market context

Shanghai Pudong International Airport is expected to reach the mid-20s Celsius today, with forecasts pointing to a sunny afternoon and a high around 18°C, though another airport forecast in Shanghai shows a warmer high near 28°C and thundery showers. The market settles on the highest temperature actually recorded at the Pudong station on the day, so the relevant question is not the city-wide headline but whether the airport station prints a brief warm spike before the window closes. [1][2]

A **0% YES** crowd price implies the market is treating an outcome in the specified range as effectively impossible, but June at Pudong is normally a warm month and climatology allows for highs well into the 20s Celsius, with summer extremes above 30°C not unusual in Shanghai. That matters because a low early price can reflect thin participation rather than strong conviction, and on-chain settlement in USDC means the main risk is the final station reading, not broader weather sentiment or BTC/ETH moves. [3][4]

For traders, the key catalysts are the hourly evolution at ZSPD, any late-morning cloud break or humidity shift, and whether winds stay modest enough to permit surface heating. The market’s outcome will be pinned to the Wunderground daily history entry for Shanghai Pudong International Airport, so the last few hours before the noon UTC cut-off are the only period that can still change the settled temperature band. [1][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

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

Is this market available outside the US?

BTC Prediction is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on BTC Prediction?

Zero. BTC Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, BTC Prediction triggers a quick verification flow that finishes in minutes.