National Bank Open: Jacob Fearnley vs Jakub Mensik

Platform comparison

Market context

Jacob Fearnley and Jakub Mensik meet in the National Bank Open second round, and the current 43% YES price implies a live but still underdog-level chance for Fearnley to advance. Pre-match odds snapshots broadly favoured Mensik, with several bookmakers pricing him around 1.33-1.36 and Fearnley around 3.00-3.40, while prediction models and market tools also leaned to Mensik at roughly 70-75% win probability.[1][2][17][18]

That gap matters because the market is not just about who is better on paper, but whether the favourite actually completes the job inside the tournament’s scheduling window. Mensik is the higher-ranked player and the more heavily backed side across independent previews, but Fearnley’s price is not extreme, which leaves room for a tighter contest or a schedule-related wrinkle to affect settlement if the match is pushed beyond the seven-day rule.[1][11][12] In comparable ATP event pricing, the market usually tracks late movement in bookmaker odds more than headline rankings when the matchup is already set.[1][17]

Traders should watch official draw updates, court assignments and any weather or backlog issues in Montreal, because those are the main dependencies that can turn a straightforward winner market into a delayed or 50-50 settlement case. The match is listed for 5 August, and live event pages already show it as an upcoming second-round fixture, so any change to start time, completion status or withdrawal news will matter more than the opening crowd price.[1][3][9][13] On-chain, settlement will ultimately be in USDC, so broader BTC or ETH moves only matter here if they shift overall risk appetite rather than the match mechanics themselves.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

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.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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%.