Highest temperature in Shanghai on July 10?

Platform comparison

Market context

The underlying real-world event is the peak daily temperature recorded at Shanghai Pudong International Airport on 10 July 2026, measured in degrees Celsius. Historical data confirms July is Shanghai’s hottest month, with average highs near 32°C and frequent spikes exceeding 35°C during sunny conditions[1][6]. The current crowd-implied probability of 0% for a specific low range contradicts this climatic baseline, as past records show temperatures regularly surpassing 30°C in summer, making a low-temperature outcome statistically improbable[1][2].

Traders should monitor real-time weather feeds from Wunderground and AccuWeather for sudden shifts in cloud cover or humidity, which directly influence peak temperatures[2][4]. A key catalyst is the upcoming monsoon activity forecast for the East China region, which could suppress highs if heavy precipitation arrives before midday[7]. Additionally, macro crypto factors like BTC funding rates and ETH whale flows may indirectly affect liquidity in this market, as volatile on-chain mechanics often correlate with reduced participation in weather-linked prediction contracts[3]. Recent news from the China Meteorological Administration highlights increased rainfall risks for Shanghai this week, a dependency that could materially alter the settlement outcome[4].

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 — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

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.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.