Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Trump Prediction) Pick polygram.ink (preferred broker) |
90% | 10% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
90% | 10% | 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 |
|---|---|
| 35°C | 90% |
| 34°C | 10% |
| 36°C | 3% |
| 28°C or below | 0% |
| 29°C | 0% |
| 30°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 37°C | 0% |
| 38°C or higher | 0% |
Market context
Shenzhen is in the middle of its wet, hot summer regime, with official local forecasts on 7 August pointing to fine to cloudy conditions and a maximum around 34°C, while the city’s high-temperature warning says the surrounding air flow from Typhoon “Bai Dolphin” could push daytime highs to 36°C or above over 6–10 August.[7][13] That matters because this market resolves to the highest value in Weather Underground’s Daily Observations for Shenzhen Bao'an International Airport, not the headline day-high figure, so a brief spike at the station is what counts rather than the general forecast range.
The current 0% crowd price is far below the usual August climate profile, where Shenzhen commonly sits around the low 30s Celsius with frequent rain and humidity.[3][17][20] Comparable cases in this part of the calendar usually settle on a single hot reading rather than a broad forecast band: when the city is under subsiding air from a nearby tropical system, the hourly observation can run a degree or two above the forecast maximum, especially inland or late in the day.[13] That is the key historical lens here — the market is really a test of whether the airport station logs an isolated peak above the expected mid-30s.
For traders, the main catalyst is the sequence of local weather bulletins and any update to the typhoon-related high-temperature warning, because those notices are already signalling an extended hot spell through 10 August.[13] A more aggressive forecast from Guangzhou’s observatory would be the immediate bullish trigger, while a sudden rain band or cloud cover would cap the upside; the Hong Kong weather briefing for Guangdong already has Shenzhen at 27–34°C for the morning issue, which is consistent with a warm but not extreme outcome.[7] The market is therefore leaning most heavily on official forecast revisions and near-term observation updates rather than on broader seasonal averages.
Methodology
Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Shenzhen on August 7? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.
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.
- Can prediction markets influence election outcomes?
- Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.
- 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.
- How fast do political markets react to news?
- High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.
- 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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