Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Trump Prediction) Pick polygram.ink (preferred broker) |
84% | 16% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
84% | 16% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 36°C | 84% |
| 37°C | 17% |
| 38°C | 1% |
| 30°C or below | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C | 0% |
| 35°C | 0% |
| 39°C | 0% |
| 40°C or higher | 0% |
Market context
Shenzhen is set for a very hot day, and the practical question is whether the airport station’s *observed* peak lands in the upper 30s Celsius or trims back towards the mid-30s once cloud and showers build later on. Weather Underground’s Shenzhen Bao’an International Airport feed was already showing **96°F** at 5:39 am CST, with a forecast of **nearly the same as yesterday** and an overnight low of **84°F**, so the market is leaning on the persistence of entrenched heat rather than any dramatic cool-down[10].
That makes the current **0% YES** imply an extreme outlier on the resolution bands rather than an outright absence of heat. Comparable Shenzhen forecasts from AccuWeather and other weather services are clustering around a daily high of about **97°F**/**36–35°C**, with daytime heating strongest in the early-to-mid afternoon and some risk of evening thunderstorms or showers afterwards[2][3][5]. In that context, a settle-in-the-top-band outcome would require the airport station to record a notably higher maximum than the wider city forecasts are pointing to, which is less common than a result sitting in the dominant forecast range[2][3][13].
For traders, the key catalyst is not a campaign-style event but the live weather sequence: whether the midday heat builds as forecast, and whether convective cloud or rain arrives early enough to cap the maximum before the settlement window closes. The market is effectively leaning on the latest Wunderground observation at Shenzhen Bao’an International Airport, with the main dependency being the intraday temperature path rather than the summary high on other weather pages[10]. Changes to short-term hourly forecasts from AccuWeather, especially the 1 pm to 4 pm window, are the most relevant external read-through because they show the same basic setup: strong heating first, then a rising chance of thunderstorms later in the day[2][3].
Methodology
This page tracks Highest temperature in Shenzhen on August 8? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Trump Prediction provide a 0%-fee route into the same order book.
Resolution & payout
For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.
UK Frequently Asked Questions
- How accurate are political prediction markets?
- Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.
- What resolution source is used for elections?
- Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.
- Which platform has the deepest political liquidity?
- Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Trump Prediction route into the same order book at 0% fees.
- Are political prediction markets legal in my country?
- It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.
- Are UK election prediction markets available from the UK?
- Yes. Betfair Exchange and Smarkets offer UKGC-regulated UK election markets (seat counts, party share, constituency results). Polymarket also lists UK election contracts with deeper global liquidity. Betfair winnings are typically tax-free for UK individuals; Polymarket profits are subject to HMRC CGT.
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