Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
83% | 17% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
83% | 17% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 29°C | 83% |
| 30°C | 11% |
| 31°C | 4% |
| 32°C | 2% |
| 33°C | 1% |
| 25°C or below | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 34°C | 0% |
| 35°C or higher | 0% |
Market context
Chengdu’s airport maximum on 6 August is usually shaped by heat, humidity and showers rather than a clean, dry heatwave. Long-run August guides put typical daytime highs around 30–32°C, while the city’s seasonal profile shows the 6 August average high near 29.2°C and occasional peaks well above that, with some sources citing possible highs into the mid-to-high 30s Celsius. [1][5][9][20]
The current 0% Yes implies the market is pricing in a very low chance that the day’s airport high lands in the contract’s Yes band, which is notable because official city forecasts for Chengdu on 6 August 2026 have still pointed to a maximum near 35°C with rain, and nearby private forecast pages show similar upper-30s / low-30s daytime readings for the date. In practice, a rainy forecast can still produce a brief spike if cloud breaks occur, but it can also cap the maximum if showers persist through the warmest hours. [8][3][4]
For traders, the key inputs are the airport station’s actual midday and early-afternoon observations on the Wunderground history page, not the broader city forecast. The main catalysts are any forecast updates from Chinese and international weather providers, the timing of convective rain around Chengdu, and the usual late-summer pattern of muggy air and scattered showers that can swing the top reading by a degree or two. In crypto terms, the event settles in USDC on-chain, so the market is likely to reflect broader risk appetite only at the margin unless BTC or ETH volatility is unusually elevated, drawing in cross-market liquidity.
Methodology
This page reads Highest temperature in Chengdu on August 6? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.
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 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.
- 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%.
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