Highest temperature in Shenzhen on July 23?

Platform comparison

Market context

Shenzhen is already in the heat of its July climatology, with average daily highs around 31.1°C and very humid conditions, so the market is really about whether the day peaks modestly above, at, or below that seasonal norm at Shenzhen Bao’an International Airport Station.[1][2] A 0% YES price suggests the crowd is treating the contract as effectively settled against an extreme reading, but that should be read alongside the fact that the resolution hinges on the single highest temperature recorded on the day, not the average, which can move differently with sunshine, cloud cover, and afternoon convective weather.[1]

For comparison across venues, the implied probability here is far detached from the weather backdrop in a way that would normally be unusual for a same-day Shenzhen temperature outcome: AccuWeather’s live conditions show Shenzhen already warm and humid early in the day, with a temperature of 84°F and a RealFeel of 96°F, which is consistent with a high-temperature regime rather than a cool outlier.[2] In practical terms, there is no visible sportsbook-style line in the prompt to anchor a direct cross-market arb, so the main divergence is between the prediction market’s flat 0% pricing and the meteorological baseline, which points towards a normal-to-hot July outcome rather than an implausibly low maximum.[1][2]

Traders should watch the local hourly progression through late morning and early afternoon, since the settlement source is the Wunderground daily history page for Shenzhen Bao’an International Airport Station and the contract resolves on the day’s maximum Celsius reading.[1] Any cloud build-up, rain bands, or sea-breeze influence that suppresses insolation could cap the high, while a clear, sun-drenched afternoon would support a stronger maximum; the key dependency is therefore the local forecast evolution rather than a formal announcement schedule.[1][2]

Sources: 1 · 2

Methodology

We track Highest temperature in Shenzhen on July 23? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.