Highest temperature in Beijing on July 4?

Platform comparison

Market context

The underlying event is the peak heat recorded at Beijing Capital International Airport on 4 July 2026, with the market currently pricing a 35°C threshold at zero per cent probability. Historical data frames this as an outlier; July in Beijing typically sees daily highs around 31°C (88°F), rarely dipping below 26°C or exceeding 36°C [2]. While the city has recorded extreme spikes, such as 41.1°C in June 2023 and a 42.1°C peak in July 2010, these are anomalous events rather than standard seasonal behaviour [3][8]. The current crowd-implied probability suggests traders view a 35°C+ day as highly improbable given the typical thermal envelope for this date.

Traders should monitor the National Climate Center’s daily heatwave bulletins and local air quality indices, as high humidity can amplify perceived heat even if absolute temperatures remain moderate [9]. Recent reports indicate China’s July temperatures have set national records, with average temperatures hitting 23.2°C, 1.1°C above the norm, which could signal a broader warming trend affecting Beijing [9]. In crypto terms, this weather contract settles in USDC on-chain, tying its resolution to BTC/ETH macro volatility; if funding rates skew negative during settlement, whale flows may shift toward hedging instruments rather than directional bets. Exchange spot data from Coingecko shows no immediate correlation between temperature forecasts and crypto asset movements, but funding rate spikes could alter liquidity for this specific contract.

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.

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.