Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Legal UK) Pick polygram.ink (preferred broker) |
43% | 57% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
43% | 57% | 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 |
|---|---|
| 28°C | 43% |
| 29°C | 43% |
| 27°C | 10% |
| 30°C | 7% |
| 24°C or below | 0% |
| 25°C | 0% |
| 26°C | 0% |
| 31°C | 0% |
| 32°C | 0% |
| 33°C | 0% |
| 34°C or higher | 0% |
Market context
The relevant event is the highest temperature recorded at Paris-Le Bourget Airport on 5 August, with settlement tied to the station’s daily maximum in Celsius. In late-summer Paris, typical August highs are usually in the low-to-mid 20s Celsius, though forecast services still show day-to-day variability and the occasional push towards the high 20s.[1][3][5][8]
The current 0% YES price is best read against the market’s narrow definition rather than against general Paris weather. Similar heat events in France have produced very large spikes, including 40.9°C in Paris during the June 2026 heatwave cited by WeatherSpark and Reuters, which shows that extreme outcomes are possible but not routine.[2][13][14][17] For regulatory context, German GlüStV treatment depends on whether a platform is offering gambling-like products to German residents, while US CFTC reach is most relevant where a market is viewed as a derivatives-style contract rather than a pure opinion wager; neither point changes the weather outcome, but both affect access and enforcement risk.
For accessibility, “no-KYC up to $1,500” usually means small-volume participation may be possible without full identity verification, but it does not remove jurisdictional screening, sanctions checks, or platform limits. Traders will mainly watch the Paris forecast, any heat warnings from French weather services, and whether cloud cover, rain, or sea-breeze effects reduce afternoon maxima; current local forecasts have pointed to dry, sunny conditions and around 29°C for 5 August, which is materially above average but not yet near the extremes seen in June 2026.[10][14][17]
Methodology
This overview of Highest temperature in Paris on August 5? 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
- Do I need to KYC for Polymarket Legal UK?
- Not for lifetime trading volume under $1,500. Above that threshold, a quick KYC flow kicks in — ID, selfie, approximately 5-10 minutes. The threshold matches FATF travel standards for unregulated crypto platforms.
- 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.
- What happens during a tax audit?
- You're responsible for documenting your trades. Polymarket Legal 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).
- What if regulation changes?
- If regulation changes in your jurisdiction (e.g. prediction markets are banned), Polymarket Legal UK would geo-block the affected region and continue processing withdrawals. Your funds remain withdrawable at any time.
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