Highest temperature in Shanghai on July 23?

Platform comparison

Market context

Shanghai’s temperature on 23 July will be decided by the highest reading recorded at Shanghai Pudong International Airport, with settlement based on the Wunderground daily history page and paid in USDC on-chain once the result is known. The market’s 0% YES crowd price implies traders are not currently assigning any meaningful chance to the specific outcome tied to the upper temperature band, even though the contract itself resolves from a single observed airport station reading rather than a citywide average.

Shanghai in July is typically hot, humid and prone to convective showers, with a normal daily high around 31°C and average humidity above 80%, so outcomes often cluster in the mid-30s rather than extreme heat. That makes the current pricing more a statement about distribution than about whether it will be warm at all: the frontrunner on the exchange is 36°C at 40%, followed by 35°C at 35%, which suggests the crowd expects a narrow band around the day’s peak rather than a sharp break higher or lower.[1][2]

For traders, the main catalysts are the local forecast updates, any last-minute shifts in cloud cover, rainfall or sea-breeze patterns around Pudong, and how those feed into the afternoon maximum before the 12:00 UTC settlement window closes. In broader crypto terms, this is a small-weather contract, so BTC and ETH direction usually matters only indirectly through market-wide liquidity and risk appetite; what matters more is whether spot conditions keep implied funding and whale flows calm enough for prediction-market pricing to track meteorology rather than broader crypto volatility.[1][2]

Sources: 1 · 2

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 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 volatile are crypto prediction markets?

Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.

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.