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 |
|---|---|
| 90-91°F | 100% |
| 81°F or below | 0% |
| 82-83°F | 0% |
| 84-85°F | 0% |
| 86-87°F | 0% |
| 88-89°F | 0% |
| 92-93°F | 0% |
| 94-95°F | 0% |
| 96-97°F | 0% |
| 98-99°F | 0% |
| 100°F or higher | 0% |
Market context
The highest temperature recorded at LaGuardia on 9 August sits in a market already priced as a near-lock, with the crowd-implied probability at **0% YES** on the opposite side of the book. That makes **90–91°F** the clear favourite and leaves the rest of the range buckets as deep underdogs; the main handicapper’s question is not whether the day was warm, but whether the final observed peak landed close enough to nudge the reading into an adjacent band. Weather Underground’s latest Manhattan/LGA report showed **88.0°F** at 1:51 pm local time, with a 6-hour high of **89.1°F**, which is consistent with the market’s consensus that the upper 80s to low 90s was the live zone. [1][4]
Historically, late-summer New York City highs often cluster tightly around the low-to-mid 80s, but the market is already assuming a hotter-than-normal outcome, which is why the favourite is so compressed. AccuWeather’s monthly outlook for New York had **90°F** listed for 9 August, reinforcing the idea that the consensus leaned towards a warm finish rather than a miss into the 80–89°F bands. That said, a single cloud burst, sea-breeze shift, or earlier-than-expected afternoon plateau can still leave value in contrarian slices of the distribution if the observed maximum stalls just under the headline forecast. [2][14]
For traders, the catalysts are mostly observational rather than event-driven: the key is the final Weather Underground Daily Observations entry for LaGuardia, because that is the settlement source, not the summary high/low panel. The National Weather Service’s public forecast products for New York and the OKX briefing materials matter only insofar as they signal whether the day had a strong warming trend or a cap from marine influence; after the fact, the market should hinge on the precise timestamped maximum rather than forecast headlines. With the book already priced as if the main outcome is settled, the remaining value is usually in the tails, especially if late-day readings plateaued below the forecast peak. [3][5][10][12]
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 Who Will Win, which mirrors the Polymarket order book directly.
Resolution & payout
Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.
Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.
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%.
Trade Highest temperature in NYC on August 9? on Who Will Win
Live order book, 0% fees, USDC settlement in seconds.
Open live market →