National Bank Open: Caty McNally vs Alexandra Eala

Platform comparison

Market context

Caty McNally and Alexandra Eala are listed for the National Bank Open in Toronto, but the match has not yet produced a completed result, so the market is still being driven by pre-match positioning rather than any live scoreline.[6][11] The crowd-implied 17% for McNally is well below a coin flip, which suggests traders are leaning towards Eala, consistent with the tournament listings that place Eala ahead in the matchup view.[2][8]

The historical frame is thin because the pair have no established tour-level head-to-head, so there is no direct matchup record to anchor pricing.[3][5] That makes season form and level of opposition more relevant: Eala has been steadier over the last 12 months in several stat feeds, while McNally’s win rate is also solid but her recent match results have been more mixed in head-to-head comparison tools.[1][5][7] In that setting, a low McNally price usually reflects the market giving extra weight to ranking, hard-court competence, and recent draw context rather than past meetings.

The main catalysts are straightforward: the match must actually begin and then finish, because a cancellation, tie, or a delay beyond seven days pushes the market to 50-50 under the rules.[6] Traders should watch the tournament’s official match pages and live scoring feeds for any schedule change, court move, or postponement, since the listed August 8 start has already passed relative to the settlement clock and any fresh rescheduling would matter immediately.[6][11]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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%.