Highest temperature in Shanghai on July 24?

Platform comparison

Market context

Polymarket has this Shanghai airport temperature contract pinned to **USDC on Polygon**, with the market currently pricing a **0% YES** outcome even though the real-world question is simply whether the day’s top reading at Shanghai Pudong International Airport clears the relevant range on 24 July. The settlement point is the **highest temperature recorded that day** on Wunderground’s history page for ZSPD, so the trade is really about the afternoon peak at the airport station rather than citywide averages or forecasts for central Shanghai.

That near-zero price is easier to read against Shanghai’s summer climatology than against the title alone. July is typically hot and humid, with daytime temperatures often in the **mid-to-high 20s Celsius and frequently reaching the low-to-mid 30s** in the broader Shanghai area.[1][3] AccuWeather also shows Shanghai in the low 30s Celsius equivalent at the moment, which fits the seasonally warm setup traders would normally expect rather than an unusually cool one.[2] In that context, a 0% quote implies the market is either mispriced, still thinly traded, or anchored to a very narrow range threshold.

The main catalysts are straightforward: the airport’s actual observed maximum, local cloud cover, precipitation, and whether any late-day heating persists after morning rain or sea-breeze effects. Traders should watch the Shanghai Pudong hourly forecast through the session, because a dry, sunny afternoon can lift the terminal reading, while showers or persistent cloud can cap it. The key dependency is the **official Wunderground history entry** for ZSPD; once that daily maximum is logged, the conditional tokens resolve mechanically and the USDC payout follows the outcome range.

Sources: 1 · 2 · 3 · 4

Methodology

We track Highest temperature in Shanghai on July 24? 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

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