Highest temperature in Chengdu on July 23?

Platform comparison

Market context

In Chengdu, the contract resolves off the **highest temperature recorded at Chengdu Shuangliu International Airport Station** on 23 July, so the key variable is the day’s maximum reading rather than the morning or overnight profile. With the market still at **0% YES**, the implied view is that traders are treating an above-threshold outcome as effectively absent, which is a useful starting point for any rules-based model or copy-trade filter built around weather data ingestion and hourly updates.

For context, July in Chengdu is typically deep in the summer monsoon season, when humidity is high and daytime heat can build quickly if cloud cover breaks. That means the practical comparison set is not just the seasonal mean but the distribution of daily highs at the airport station: a market at zero often reflects either a very low target band or a belief that the observed maximum will stay below the nearest tradable threshold. Programmatically, the cleanest approach is to poll the resolution source, convert the airport’s highest reading to Celsius, and compare the official maximum against the market’s range buckets as the day evolves.

Traders should watch for anything that changes the local heat profile before the settlement window closes: cloud cover, rainfall timing, and airport-station observations through the afternoon matter more than the opening print. For tooling, that means setting conditional orders or alerts around published hourly updates rather than reacting to generic city forecasts, because the market resolves on one specific station’s recorded maximum. If a forecast feed shifts from overcast to partial clearing, that is the kind of input that can move an automated strategy even when headline temperature forecasts look stable.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Polymarket Bot UK. 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.

Do I need to KYC for this market?

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

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.