Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Tax UK) Pick polygram.ink (preferred broker) |
97% | 3% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
97% | 3% | 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 |
|---|---|
| 19°C | 97% |
| 20°C | 2% |
| 21°C | 1% |
| 12°C or below | 0% |
| 13°C | 0% |
| 14°C | 0% |
| 15°C | 0% |
| 16°C | 0% |
| 17°C | 0% |
| 18°C | 0% |
| 22°C or higher | 0% |
Market context
On 18 July 2026, the highest temperature recorded at Minister Pistarini International Airport in Buenos Aires will determine the settlement outcome for this market. The airport's weather station, located in Ezeiza roughly 25 kilometres south-west of the city centre, serves as the official reference point. July falls within Buenos Aires' winter season, when daytime highs typically range between 12 and 16 degrees Celsius, though cold fronts can depress readings further and occasional warm spells may push temperatures higher.
Historical temperature data from the same station reveals that July extremes in the region rarely exceed 20 degrees Celsius. The 0% crowd probability suggests traders are pricing in an expectation that the day's high will fall within the lower temperature bands offered by the market's resolution brackets. Comparable July days at Pistarini show that temperatures above 18 degrees occur infrequently during this month, making warmer outcomes statistically less likely. Seasonal patterns and long-term climate records from Argentina's National Meteorological Service indicate stable winter conditions typically prevail without significant anomalies.
Traders monitoring this market should track weather forecasts from the Argentine Meteorological Service (Servicio Meteorológico Nacional) as the settlement date approaches, particularly any alerts regarding unusual pressure systems or warm air masses moving into the region. Southern Hemisphere winter patterns, including potential polar outbreaks from Antarctica, could influence final readings. The Wunderground historical database will serve as the definitive source, with settlement occurring at 12:00 UTC on 18 July 2026 based on the highest temperature recorded across all daylight and overnight hours at the airport station.
Methodology
This overview of Highest temperature in Buenos Aires on July 18? 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.
- 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.
- Are prediction markets gambling?
- Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.
- 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).
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Polymarket Tax UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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