Livesport Prague Open: Ayla Aksu vs Sofia Costoulas

Platform comparison

Market context

Ayla Aksu faces Sofia Costoulas in the Livesport Prague Open women’s singles, a match originally set for 20 July 2026 at 8:00 AM ET. The contest has concluded, with Costoulas advancing as the winner, which explains the 100% YES crowd-implied probability that the market will resolve to Costoulas. On Polymarket, this outcome is expressed as a binary certainty, whereas Kalshi, Betfair, and Smarkets typically display decimal odds; here, the equivalent would be 1.00, reflecting no uncertainty.

Historical precedents in women’s ITCA-level tournaments show that when a player is priced at 1.39 pre-match—as Costoulas was—they win roughly 72% of encounters, yet outright cancellations or delays beyond seven days remain rare, occurring in under 3% of cases [1]. In such Prague Open fixtures, the 50-50 resolution clause for cancellations has never triggered in the past five years, reinforcing confidence in the current pricing. Traders comparing platforms should note that Polymarket’s fee structure (often 0–2%) differs from Betfair’s commission-based model (up to 6%) and Kalshi’s fixed fee, affecting net returns even when probabilities align.

Key catalysts now centre on official confirmation of the result and any post-match disciplinary actions, though none are anticipated. The match is already marked “Finished” on Šport.sk, confirming Costoulas’s victory [2]. For those monitoring schedule dependencies, the next Prague Open round begins 22 July, with no reported delays. Platform divergence remains most evident in KYC reach: Kalshi requires US identity verification, while Polymarket and Smarkets operate with lighter or no KYC, influencing liquidity depth on this resolved event.

Sources: 1 · 2

Methodology

This page compares Livesport Prague Open: Ayla Aksu vs Sofia Costoulas specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.