Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
45% | 55% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
45% | 55% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 24°C | 45% |
| 25°C | 41% |
| 23°C | 8% |
| 26°C | 8% |
| 27°C | 3% |
| 20°C or below | 0% |
| 21°C | 0% |
| 22°C | 0% |
| 28°C | 0% |
| 29°C | 0% |
| 30°C or higher | 0% |
Market context
Amsterdam's highest temperature on 15 August 2026 will be measured at Schiphol Airport weather station and resolved using Weather Underground's Daily Observations table rather than summary figures. The settlement window closes at midday on the date itself, meaning final readings must occur before noon UTC.
August temperatures in Amsterdam typically range between 17–23°C, with extremes rare but not unprecedented. Historical data shows that mid-August highs occasionally reach 25–27°C during warm European air mass intrusions, though readings above 30°C remain uncommon for this period and location. The current 0% crowd probability suggests traders expect a notably cool day relative to seasonal norms, or that the market reflects uncertainty about which specific temperature band will resolve as the highest.
Weather forecasting accuracy for a specific date two years ahead carries substantial uncertainty. Traders should monitor seasonal climate patterns and any emerging signals about European summer conditions as 2026 approaches. The resolution methodology—prioritising Daily Observations over Day High & Low summaries—creates a technical dependency worth noting; discrepancies between these Weather Underground datasets have occasionally affected similar markets. Real-time temperature monitoring on 15 August will be essential, particularly during morning and early afternoon hours when daily highs typically occur in the Netherlands.
Methodology
Sports-specific comparison page for Highest temperature in Amsterdam on August 15?. 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.
UK Frequently Asked Questions
- 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.
- What are live sports odds on Polymarket?
- Some top-tier matches stay open during play — you can trade the half-time probability in the 70th minute. Polymarket mid-prices update second-by-second; any frontend mirroring the order book shows the same movement.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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