Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Sport Prediction) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 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 |
|---|---|
| 100-101°F | 100% |
| 95°F or below | 0% |
| 96-97°F | 0% |
| 98-99°F | 0% |
| 102-103°F | 0% |
| 104-105°F | 0% |
| 106-107°F | 0% |
| 108-109°F | 0% |
| 110-111°F | 0% |
| 112-113°F | 0% |
| 114°F or higher | 0% |
Market context
Dallas Love Field’s peak on 6 August hinged on a familiar North Texas heat setup: midsummer sunshine, a dry boundary layer and only limited relief from overnight cooling. The crowd’s 0% YES price looks extreme against the broader August climatology, because Dallas regularly spends this stretch in the mid-to-upper 90s and can still reach the low 100s when a ridge holds over the southern Plains.[1][8] The market’s own pricing references a 100–101°F area as the leading band, with 98–99°F next, showing traders were already leaning towards a near-triple-digit outcome rather than a cool day.[2]
Comparable cases suggest the key question is not whether Dallas gets hot, but how high the official Love Field observation climbs before the daily peak is locked in. Weather Underground’s historical page is the settlement source here, so traders should focus on the highest reading in the Daily Observations table rather than the summary high/low banner.[3] National Weather Service materials also show how quickly Dallas can print 100°F days in late summer, which makes a sub-100 outcome possible but not the default when forecast heat persists.[4][8]
The main catalysts were the short-range forecast trend, any last-minute cloud or thunderstorm cover, and the timing of the final Daily Observations update at Love Field. If later model runs kept the afternoon high near the low 100s, the 0% YES implied probability would have remained vulnerable to a sharp repricing; if the forecast trimmed back towards the upper 90s, the market would have had more room to justify the zero line. Local reporting on 6 August described “triple-digit” heat continuing across North Texas, reinforcing that the decisive variable was the exact peak, not the fact of a hot day.[9]
Methodology
Sports-specific comparison page for Highest temperature in Dallas on August 6?. 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
- Are prediction markets better than sports betting?
- Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.
- 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.
- 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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