Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Who Will Win 2026) Pick polygram.ink (preferred broker) |
99% | 1% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
99% | 1% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | See live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | See live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | See live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | See live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 33°C | 99% |
| 34°C | 2% |
| 27°C or below | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 35°C | 0% |
| 36°C | 0% |
| 37°C or higher | 0% |
Market context
Shanghai’s midday-to-afternoon heat on 8 August is the key variable, with the market resolving off the **highest reading in Weather Underground’s Daily Observations** for Pudong rather than any summary high. The crowd is pricing **0% YES**, which makes the “favourite” effectively the under one of the listed temperature bands, and the value question is whether a normal August warm-up pushes the day into a higher bucket than consensus expects. Wunderground’s Shanghai history page already shows 8/8/2026 at a listed high of **93°F** and 8/7/2026 at **95°F**, which is about **34°C** and **35°C** respectively, so the recent run-up has been hot enough to keep upper ranges live even before the full day is locked in.[1]
For framing, Shanghai in August is typically hot, with averages around **32–33°C** for daytime highs and frequent humidity, which means outcomes above the low-30s are not unusual in this part of the season.[2][6][11] Recent comparable August readings in Shanghai have also reached the mid-30s °C, including years with highs around **35°C** and even higher isolated spikes, so a contrarian case against a zero-priced YES is that the location can overshoot the broad climatological average when heat and moisture align.[6][11][16] That said, the current market is still leaning on the absence of a guaranteed extreme, so the consensus appears anchored to a more ordinary hot-day outcome rather than a sharp break into the highest band.
The main catalysts for traders are the live station observations through the day, because this market depends on the **observed maximum at Shanghai Pudong International Airport Station** and not a forecast headline or summary panel.[9] The cleanest dependencies are the timing of the warmest late-morning to mid-afternoon readings, any cloud cover or showers that suppress the peak, and whether the station’s Daily Observations table updates cleanly before the settlement window closes at 12:00 UTC. Forecast-style pages already point to Shanghai remaining warm around this period, but those are secondary here; the decisive number is the station record itself on Wunderground.[14][16]
Methodology
This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win 2026, which mirrors the Polymarket order book directly.
Resolution & payout
Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.
Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.
FAQ
- Where can I trade this market with the lowest fees?
- Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.
- Is this market available outside the US?
- Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.
- What's the difference between YES and NO shares?
- A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.
- What does Polymarket cost to trade?
- Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.
- How fast are USDC deposits?
- Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.
Trade Highest temperature in Shanghai on August 8? on Who Will Win 2026
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