Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via BTC Prediction) Pick polygram.ink (preferred broker) |
33% | 67% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Open live market → |
Polymarket (direct) polymarket.com |
33% | 67% | 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 |
|---|---|
| 27°C | 33% |
| 28°C | 26% |
| 26°C | 21% |
| 29°C or higher | 12% |
| 25°C | 10% |
| 23°C | 1% |
| 24°C | 1% |
| 19°C or below | 0% |
| 20°C | 0% |
| 21°C | 0% |
| 22°C | 0% |
Market context
Munich Airport’s daytime high for 6 August will be set by whatever the station records as its warmest reading before the market’s midday UTC cutoff, so the main question is whether conditions stay near a typical late-summer high or push into a warmer band. Munich’s August climatology points to an average daily high around 24.7°C, while the station’s all-time August record high is 37.0°C, showing that very hot outcomes are possible even if they are not the norm.[1]
The current 0% YES price looks difficult to read as a pure weather forecast because it may reflect market structure as much as temperature expectations. For comparison, historical August records at Munich show a broad spread, with a daily record high of 35.3°C on 6 August in the ExtremeWeatherWatch table and 35.8°C later in the month, so a high in the 30s would not be unprecedented in early August.[1] If the contract is being priced through USDC liquidity, the path of least resistance can also be shaped by overall crypto risk appetite: BTC and ETH spot moves, perpetual funding, and any large on-chain flows often affect how tightly prediction markets reprice even when the underlying event is non-crypto.
The key catalysts are the live Munich weather trend, any forecast updates from major weather services, and the exact Wunderground station reading used for settlement.[2] Traders should watch for clear-sky, high-pressure setups versus cloudier or wetter patterns, because those can determine whether the daily maximum lands in a lower or higher temperature bucket. The market cannot resolve until the contract’s settlement window closes at 12:00 UTC, so intraday heat spikes before then matter more than the eventual evening temperature.[2]
Methodology
This page reads Highest temperature in Munich on August 6? 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
- What are crypto prediction markets?
- Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.
- 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.
- 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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