Highest temperature in Guangzhou on July 27?

Platform comparison

Market context

Guangzhou’s airport station temperature for 27 July will settle on the day’s **highest recorded reading** at Guangzhou Baiyun International Airport, converted into the market’s listed Celsius range and paid out in USDC if the range matches the final print. With the window ending at 12:00 UTC, the contract is effectively a one-day weather binary keyed to the official daily maximum rather than the afternoon forecast alone, so late-day heating and storm-driven relief both matter more than the early-morning print.

The current 0% YES pricing implies the crowd is treating this as a very low-probability outcome, but that should be read cautiously because July in Guangzhou is climatologically hot and volatile, with forecast services already flagging unstable conditions and a wide band of possible highs, including readings up to the upper 30s °C over the coming period. Recent forecast snapshots for Guangzhou show temperatures well above cool-season norms, with models varying between dry, sunny spells and wetter, storm-active intervals, which is exactly the kind of setup that can swing a daily maximum into adjacent settlement buckets.

For traders, the main catalysts are the intraday forecast updates, radar/tracking of convective rain, and any shift in wind or cloud cover that changes how quickly the airport site heats before the afternoon peak. In crypto terms, the market is mechanically simple—USDC-settled and event-driven—but the wider tape still matters: if BTC and ETH are volatile, on-chain positioning and peripheral risk appetite can affect how quickly the market reprices after a weather-model change. The most relevant external dependency remains the Wunderground history page used for resolution, since any late revision to the observed high at Guangzhou Baiyun International Airport Station determines the final outcome.

Sources: 1 · 2 · 3

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

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.

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.