Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Tax UK) Pick polygram.ink (preferred broker) |
86% | 14% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
86% | 14% | 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 |
|---|---|
| 24°C | 86% |
| 25°C | 11% |
| 26°C | 1% |
| 18°C or below | 0% |
| 19°C | 0% |
| 20°C | 0% |
| 21°C | 0% |
| 22°C | 0% |
| 23°C | 0% |
| 27°C | 0% |
| 28°C or higher | 0% |
Market context
The real-world event driving this market is the peak daily temperature recorded at São Paulo-Guarulhos International Airport on 6 July 2026, measured in degrees Celsius. Historical data confirms that July is São Paulo’s coldest month, with average highs around 22°C (72°F) and lows near 13°C (56°F), making extreme heat unlikely [2]. Recent records show the city’s highest temperature reached 37.7°C in September 2023, while Rio de Janeiro experienced a heat index of 62.3°C during a separate heatwave, but such extremes are not typical for São Paulo in mid-winter [6][7]. The current 0% crowd-implied probability for higher temperature brackets aligns with these seasonal patterns, suggesting traders view a significant spike as statistically improbable.
Traders should monitor official weather bulletins from Brazil’s National Institute of Meteorology (INMET) and Wunderground updates, which serve as the settlement source, for any anomalies in the coming days [query]. While no immediate heatwave announcements exist, global climate models occasionally flag unexpected warm spells in southern Brazil during July, though such events remain rare [1]. A recent BBC report noted Brazil’s record high of 44.8°C in 2023, but this occurred during a summer heatwave, not winter, reinforcing the low likelihood of a similar event in July [9]. Regulatory frameworks like Germany’s GlüStV and US CFTC rules govern market accessibility, with “no-KYC up to $1,500” allowing broader participation without identity verification, enhancing liquidity for this specific weather-based prediction.
Methodology
This overview of Highest temperature in Sao Paulo on July 6? reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.
Resolution & payout
On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.
FAQ
- Is Polymarket legal in my country?
- Polymarket is geo-blocked in the US/UK/EU. Actual usage via the Polymarket interface is not possible there. The legal status itself varies — many countries treat prediction markets as a gray area. Polymarket Tax UK has a different geo footprint.
- How are winnings taxed?
- Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.
- Can I trade anonymously?
- Pseudonymously, yes — up to the KYC threshold. Polymarket Tax UK stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.
- What happens during a tax audit?
- You're responsible for documenting your trades. Polymarket Tax UK exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
- Is there a withdrawal cap?
- No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).
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