Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
56% | 44% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
56% | 44% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Open live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Open live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Open live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Open live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 22°C | 56% |
| 23°C | 20% |
| 21°C | 19% |
| 24°C or higher | 7% |
| 14°C or below | 0% |
| 15°C | 0% |
| 16°C | 0% |
| 17°C | 0% |
| 18°C | 0% |
| 19°C | 0% |
| 20°C | 0% |
Market context
Munich Airport's daily maximum temperature on 21 August 2026 will be recorded and settled against predefined Celsius bands. The resolution hinges on Weather Underground's Daily Observations table for Munich Airport Station, which serves as the authoritative source rather than summary high-low figures. Settlement occurs in USDC on the prediction market platform following the close of the settlement window at 12:00 UTC on that date.
August temperatures in Munich typically range between 24–28°C, with historical highs occasionally reaching 30–32°C during heat waves. The 0% crowd probability suggests traders are pricing in either extreme confidence in a specific temperature band or minimal liquidity across the full range. Comparable August weather events in Bavaria show that sustained high-pressure systems can drive daily maxima above 30°C, whilst Atlantic low-pressure intrusions tend to suppress readings below 24°C. The current flat probability distribution indicates the market has not yet anchored to seasonal norms or recent climate patterns.
Traders should monitor European weather forecasting updates from mid-August 2026, particularly from Deutscher Wetterdienst (DWD) and ECMWF model runs, which typically converge 7–10 days before the event. Jet stream positioning and any Atlantic blocking patterns will be material catalysts. Real-time temperature data from Weather Underground's Munich Airport feed becomes critical in the final 48 hours; funding rates and whale positioning on adjacent European weather markets may signal informed traders' directional conviction ahead of settlement.
Methodology
This page reads Highest temperature in Munich on August 21? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.
Resolution & payout
Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.
Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.
UK Frequently Asked Questions
- Why USDC and not ETH or USDT?
- USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.
- What does a transaction cost on Polygon?
- Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.
- 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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