Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via PolyGram) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
100% | 0% | 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 |
|---|---|
| 78-79°F | 100% |
| 65°F or below | 0% |
| 66-67°F | 0% |
| 68-69°F | 0% |
| 70-71°F | 0% |
| 72-73°F | 0% |
| 74-75°F | 0% |
| 76-77°F | 0% |
| 80-81°F | 0% |
| 82-83°F | 0% |
| 84°F or higher | 0% |
Market context
Los Angeles will experience some temperature reading on 14 August 2026, and this market isolates the highest hourly observation recorded at LAX station rather than the daily summary figure—a distinction that matters when Weather Underground's granular data occasionally diverges from rounded reporting. The current 0% YES probability reflects the market's assessment that no specific temperature threshold has attracted sufficient conviction among traders, leaving conditional tokens priced at extremes across the range buckets available on Polygon.
Historical August temperatures at LAX show a median high around 77–79°F, with the station's all-time August record of 97°F set in 1961. The past decade has produced August highs clustering between 75–85°F, with only three instances exceeding 90°F since 2010. This distribution anchors expectations: extreme heat remains possible but statistically uncommon, which explains why traders have not yet committed USDC to any particular range. The 2023 and 2024 August periods saw typical mid-70s peaks, establishing a baseline against which any significant deviation would register.
Traders monitoring this contract should track National Weather Service forecasts released in early August, which will provide the first actionable signal for seasonal positioning. El Niño or La Niña conditions entering late summer could shift atmospheric patterns, though such effects typically manifest over weeks rather than single days. The settlement window closes at midday on 14 August 2026, meaning the highest temperature will be locked before afternoon heating peaks—a technical detail that affects how traders should interpret any late-morning forecast updates.
Methodology
This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.
Resolution & payout
Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.
Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.
UK Frequently Asked Questions
- How does resolution work?
- Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.
- What's the difference between YES and NO shares?
- A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.
- 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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