Bunschoten: Jan Kumstat vs Florian Broska

Platform comparison

Market context

Jan Kumstat and Florian Broska are set to face each other in a Bunschoten tennis match originally scheduled for 4:00 AM ET on 16 July 2026. In prediction markets, a YES share pays out if the market’s outcome occurs—here, if Jan Kumstat advances past Broska—while a NO share pays if he does not. The current crowd-implied probability of 100% YES suggests traders are virtually certain Kumstat will win, though this leaves no room for error if the match is cancelled, delayed beyond seven days, or ends in a tie, which would trigger a 50–50 resolution.

Historically, markets pricing a single outcome at 100% often reflect either overwhelming player dominance or a lack of competitive data, such as when one competitor is significantly higher-ranked or has a recent winning streak against similar opponents. In tennis, such extremes can also arise when a match is effectively a foregone conclusion due to injury concerns, withdrawal rumours, or scheduling imbalances, though these cases sometimes reverse sharply if new information emerges before play begins.

Traders should monitor official tournament schedules, player injury updates, and any announcements regarding match postponements or venue changes, as these are the primary catalysts that could alter the 100% probability. With the settlement window closing on 23 July 2026, any delay beyond seven days from the original date without a winner would reset the market to 50–50, making timely news from the tournament organiser or player representatives critical for assessing risk.

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.

FAQ

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 Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Market UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.