Highest temperature in Chengdu on July 31?

Platform comparison

Market context

The relevant event is the **day’s highest temperature at Chengdu Shuangliu International Airport** on 31 July, which Wunderground will use for settlement, so the market is effectively a bet on whether the airport reaches a given Celsius band before the day closes in local time. At 11:00 UTC, Chengdu is already in the warm part of the afternoon, and the live forecast cluster is centred around the low-to-mid 30s Celsius rather than anything extreme.[2][3][14]

That makes the current 0% YES pricing easier to read as a thin-liquidity outlier than as a statement that heat is impossible. Comparable July climatology for Chengdu usually sits around 30–35°C by day, with some forecasts pushing the peak higher and others keeping it near 33°C, while July is also one of the wetter months, which can cap temperatures if cloud and showers arrive early.[4][11][16] Against that backdrop, a reading in the forecasted band looks materially more plausible than a sub-30°C outcome, so the market can reprice quickly if the observed model guidance narrows or a cooler rain-bearing spell persists.[2][4][14]

For traders, the main catalysts are the intraday weather updates themselves: a shift in rain timing, cloud cover, or wind strength over the afternoon can move the eventual maximum more than the morning temperature. There is no on-chain settlement dependency beyond the market’s USDC payout logic, but broader crypto conditions can still affect positioning if BTC and ETH volatility changes risk appetite or market makers widen spreads; the immediate driver here remains the Chengdu forecast and any fresh observation from the airport station.[12]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Chengdu on July 31? 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.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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.