Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Who Will Win) 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 |
|---|---|
| 98-99°F | 100% |
| 93°F or below | 0% |
| 94-95°F | 0% |
| 96-97°F | 0% |
| 100-101°F | 0% |
| 102-103°F | 0% |
| 104-105°F | 0% |
| 106-107°F | 0% |
| 108-109°F | 0% |
| 110-111°F | 0% |
| 112°F or higher | 0% |
Market context
Dallas Love Field’s recorded high for 9 August is the key number here, and the crowd is treating the market as a near-certain **favourite** at 0% YES implied probability, which leaves no obvious consensus disagreement on the directional call. That sort of pricing usually means traders expect the day’s maximum to land in the most obvious late-summer band, with the market already behaving like a settled result rather than a live weather bet. Weather Underground’s Daily Observations table is the resolution source, so the only real risk is a late update that changes the official peak after the first reading for the following date is published.[8][3]
For framing, Dallas in August commonly prints very warm afternoons, and recent comparable Dallas weather references show highs around 99°F to 100°F for 9 August, with AccuWeather showing 100° for the date and Weather Underground’s Dallas history page already indicating a hot day in the mid-to-upper 90s by evening.[2][1][9] That makes the current 0% YES line look like an **underdog** only in a technical sense; the value case is not in a surprise extreme, but in whether the market has underweighted the possibility of a one-degree revision in the official observation record. Contrarian interest would sit in the narrow temperature bands that capture an official max just below or above the consensus cluster, rather than in an outright cool-day outcome.[3][8]
The trader watchlist is simple: the final Daily Observations entry from Weather Underground, any post-midnight revisions, and the timestamp of the first datapoint for 10 August, because the market’s rules freeze changes once that next-day data appears.[8] In practical terms, there are no major scheduled catalysts left; this is a data-validation market now, not a forecast market. If the Weather Underground record and other local weather summaries diverge, the Daily Observations table controls, which is where late-value angles and false certainty can show up.[8][1]
Methodology
This page reviews Highest temperature in Dallas on August 9? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.
Resolution & payout
At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.
On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.
UK Frequently Asked Questions
- Is this market available outside the US?
- Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.
- 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.
- 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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