Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Election Predictions UK) Pick polygram.ink (preferred broker) |
50% | 50% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
50% | 50% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Trade this market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Trade this market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Trade this market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Trade this market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 31°C | 50% |
| 32°C or higher | 29% |
| 30°C | 20% |
| 22°C or below | 0% |
| 23°C | 0% |
| 24°C | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 27°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
Market context
Seoul is heading into a warm, unsettled day, with the market anchored to the highest temperature recorded at Incheon International Airport rather than the city centre. That matters because airport readings can sit a little lower than inland urban maxima, especially when cloud, rain and onshore flow are around, so a 0% Yes price implies traders are effectively assuming the day will fail to clear the relevant temperature band. BBC Weather currently shows Seoul at 19°C, while the Met Office forecast points to 28°C and sunny conditions, illustrating how widely short-range guidance can move even within the same morning[1][3].
The historical frame is straightforward: late July in Seoul is usually hot, humid and often rainy, with average highs around the high 20s to low 30s and frequent monsoon-season showers interrupting the heat[2][6][7]. Forecast services also show 27-28°C as a common near-term level for the city, which suggests the relevant question is not whether it is warm, but whether rain or cloud suppresses the day’s peak at the airport enough to keep it out of the target range[4][8]. In that sense, the market is leaning on the seasonal pattern of monsoon-driven volatility rather than on a stable summer baseline.
The main catalyst to watch is the Korea Meteorological Administration’s day-of updates on the stationary front, which Chosun reports could bring rain to the capital area and northern Incheon and Gyeonggi, with southern Seoul also seeing showers and maximum apparent temperatures near 33°C[5]. For traders, the key dependency is whether those rain bands arrive early enough to cap the afternoon high at Incheon; if breaks in the cloud cover widen, the airport can still print a higher maximum than a rainier urban forecast might suggest[3][5].
Methodology
This page tracks Highest temperature in Seoul on July 24? 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 Election Predictions UK provide a 0%-fee route into the same order book.
Resolution & payout
Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.
Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.
FAQ
- 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.
- 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 Election Predictions UK 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.
- Which political events have the biggest volume?
- US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.
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