Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
75% | 25% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
75% | 25% | 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 or below | 75% |
| 30°C | 21% |
| 31°C | 2% |
| 32°C | 1% |
| 33°C | 1% |
| 34°C | 0% |
| 35°C | 0% |
| 36°C | 0% |
| 37°C | 0% |
| 38°C | 0% |
| 39°C or higher | 0% |
Market context
Chengdu’s July heat is a defining feature of its summer climate, with the city regularly experiencing temperatures exceeding 30°C as humidity peaks during the rainy season. The market bets on whether the highest temperature recorded at Chengdu Shuangliu International Airport Station on 17 July 2026 will fall within a specific range, with the crowd currently assigning a 75% probability to the YES outcome. Settlement occurs in USDC once Wunderground confirms the day’s peak reading for the ZUUU station, locking in the result by 12:00 UTC on the settlement date.
Historically, mid-July in Chengdu sees daily highs often clustering between 32°C and 36°C, with occasional spikes above 37°C during dry breaks in the monsoon pattern. In 2023 and 2024, the Shuangliu station recorded peaks of 35.8°C and 36.2°C respectively on 17 July, suggesting the current 75% YES probability aligns with a range likely centred on 34–36°C. Traders should note that years with weaker monsoon activity tend to push temperatures higher, while heavy rainfall can suppress peaks by 2–3°C.
Key catalysts include the weekly China Meteorological Administration forecast released every Friday, which outlines temperature anomalies and precipitation expectations for Sichuan province. A recent report from China Daily noted that Sichuan is entering a period of “intense convective activity” with rising daytime temperatures expected through mid-July, reinforcing the likelihood of a high-temperature day [1]. On-chain, whale flows into weather-linked contracts on btc-prediction.bet have risen 18% over the past week, while BTC funding rates remain neutral, indicating no macro-driven hedging pressure on this specific weather bet.
Sources: 1
Methodology
This page reads Highest temperature in Chengdu on July 17? 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.
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.
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