Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Today) 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 |
|---|---|
| National Bank Open: Elise Mertens vs Anna Bondar Set 1 O/U 8.5 | 100% |
| National Bank Open: Elise Mertens vs Anna Bondar Set 2 Winner | 100% |
| National Bank Open: Elise Mertens vs Anna Bondar Set 2 O/U 8.5 | 100% |
| National Bank Open: Elise Mertens vs Anna Bondar Set 2 O/U 9.5 | 100% |
| National Bank Open: Elise Mertens vs Anna Bondar | 88% |
| Completed Match | 50% |
| National Bank Open: Elise Mertens vs Anna Bondar Total Sets: O/U 2.5 | 50% |
| National Bank Open: Elise Mertens vs Anna Bondar Set Handicap +/-1.5 | 50% |
| National Bank Open: Elise Mertens vs Anna Bondar Match O/U 21.5 | 50% |
| National Bank Open: Elise Mertens vs Anna Bondar Match O/U 22.5 | 50% |
| National Bank Open: Elise Mertens vs Anna Bondar Match O/U 23.5 | 50% |
| National Bank Open: Elise Mertens vs Anna Bondar Set 1 Winner | 0% |
| National Bank Open: Elise Mertens vs Anna Bondar Set 1 O/U 9.5 | 0% |
| National Bank Open: Elise Mertens vs Anna Bondar Set 1 O/U 10.5 | 0% |
| National Bank Open: Elise Mertens vs Anna Bondar Set 2 O/U 10.5 | 0% |
Market context
Elise Mertens and Anna Bondar are set to meet at the National Bank Open, and the market is pricing a fairly one-sided Mertens advance at 88%. That sits comfortably with the pair’s previous meeting, which Mertens won in straight sets on hard court in Toronto in 2022, and with the wider head-to-head data showing her ahead 1-0 on one source and 2-0 on another, with all recorded wins going to Mertens[1][2][4][5].
The recent form and surface split also lean her way. Mertens is the higher-ranked player in the live match listings, at around WTA 24 versus Bondar’s 77-78 range, and season stats across multiple trackers show Mertens with a stronger overall hard-court profile, while Bondar’s better results have come mainly on clay[4][8][10]. A useful framing point is that Mertens has also had mixed runs in this event before, while Bondar has not progressed deep at WTA 1000 level on hard courts, so the current probability reflects a favourite with some tournament-specific volatility rather than a lock[14].
The main catalyst for traders is simply whether the match starts and finishes as scheduled, because the market only pays out on an actual advance and flips to 50-50 if the match is not played, tied, or pushed beyond the seven-day settlement window[Market description]. Live listings currently place the match on 6 August 2026, with some feeds already showing active match pages, so any late schedule shift, retirement, or weather delay is the key dependency to watch rather than a change in the underlying matchup[8][10][12][13].
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 Prediction Today, which mirrors the Polymarket order book directly.
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
- 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%.
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