Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via March Madness Predictions) Pick polygram.ink (preferred broker) |
28% | 72% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | See live odds → |
Polymarket (direct) polymarket.com |
28% | 72% | 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 |
|---|---|
| 24°C | 28% |
| 25°C | 27% |
| 23°C | 19% |
| 26°C | 17% |
| 22°C | 6% |
| 21°C | 4% |
| 27°C or higher | 3% |
| 19°C | 1% |
| 20°C | 1% |
| 17°C or below | 0% |
| 18°C | 0% |
Market context
São Paulo’s airport weather at the start of the day is sitting in the low 20s Celsius, with BBC Weather showing 21°C, steady pressure and a south-south-westerly breeze, which is a fairly ordinary July setup rather than a heat-accumulation pattern.[1] That matters because the market resolves on the *highest* temperature recorded at São Paulo–Guarulhos International Airport over the full day, so the key question is whether afternoon warming can lift the reading materially above the early-morning baseline.[1]
July is climatologically one of São Paulo’s cooler months, and typical daily highs are around 23°C, with lows near 12°C, according to July averages compiled for the city.[2] Against that backdrop, the crowd’s 0% YES price implies an expectation that today’s maximum will fall outside the market’s YES band, but the historical framing suggests traders should treat a mid-20s Celsius print as plausible if skies clear and winds stay light.[2] The relevant comparison is not extreme heat, but whether the day behaves like a normal winter afternoon or runs a touch cooler under cloud and humidity.[1][2]
For traders, the main catalysts are the airport’s observed afternoon temperatures, any shift in cloud cover or wind through the day, and whether São Paulo stays under the influence of the current stable pressure pattern.[1] If conditions remain steady, the highest reading often arrives in the early-to-mid afternoon; if showers or persistent cloud develop, the ceiling can stay close to the morning level.[1][2]
Methodology
Sports-specific comparison page for Highest temperature in Sao Paulo on July 23?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.
Resolution & payout
Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.
FAQ
- When do sports markets resolve?
- Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.
- Can I bet on individual matches?
- Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.
- How fast do sports winnings settle?
- Once the official league outcome is logged in the UMA Oracle (typically 1-2 hours after the final whistle), Polymarket's smart contract triggers USDC payout. To your wallet within minutes.
- What's the difference between match odds and outright odds?
- Match odds cover a single game ("Bayern beats BVB"). Outright odds are long-term aggregates ("Bayern wins the league"). Outright markets have deeper liquidity; match markets have faster resolution.
- Can I import form data and lineups?
- This page shows the live Polymarket quote as an implied probability. Form data and lineups must be researched separately via sports data providers (e.g. Soccerway, ESPN, FBref) — we surface the market probability, not the sport analysis.
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