Highest temperature in Beijing on August 10?

Platform comparison

Market context

Beijing’s daytime heat on 10 August is typically well into the low 30s Celsius, with August normals around 30–31°C and historical extremes on that date reaching the mid-30s. The contract settles on the highest hourly or intraday reading logged at Beijing Capital International Airport in Weather Underground’s Daily Observations table, so the relevant question is not the forecast high in a summary box but whether the airport station prints a spike above the usual seasonal band.[3][4][17]

The current 0% YES price looks detached from the climatology: late-summer Beijing commonly produces highs around 31°C, and recent historical pages show individual 10 August maxima often clustering in the low-to-mid 30s, not near zero. Comparable cases in this market family usually reprice quickly once intraday observations appear, because the final print can be driven by a brief afternoon peak rather than the overnight low or the headline summary.[4][5][17]

For traders, the live catalyst is the station feed itself: once local heating builds through the morning and early afternoon in Beijing, the decisive move is any jump in the observed temperature at ZBAA before the 12:00 UTC settlement window closes. In crypto terms, the market is a small USDC-denominated weather binary, so spot BTC and ETH levels matter mainly through broader risk appetite; funding and whale flows are unlikely to alter the weather outcome, but they can affect liquidity and spreads in the market while the temperature print is still unresolved.

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.

UK Frequently Asked Questions

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.

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.