UFC Fight Night: Yuneisy Duben vs. Jeisla Chaves (Women's Flyweight, Prelims)

Platform comparison

Active sub-markets

Market context

Yuneisy Duben, a Cuban flyweight with a 12–4 professional record, faces Jeisla Chaves on the preliminary card of UFC Fight Night: Muhammad vs. Bonfim on 6 June 2026. Duben has competed regularly in the UFC's 125-pound division since 2021, whilst Chaves brings a less extensive track record to the octagon. The bout carries standard flyweight stakes—a win advances either fighter's ranking trajectory within a crowded division, whilst a loss risks momentum loss in a competitive weight class where roster depth limits comeback opportunities.

The 0% implied probability across prediction markets reflects genuine uncertainty about fighter availability and bout confirmation rather than a settled assessment of matchup dynamics. Preliminary card slots frequently experience late changes due to injury, weight-cut complications, or scheduling adjustments within 48 hours of fight night. Historical UFC Fight Night events show roughly 8–12% cancellation or postponement rates on preliminary bouts, which explains why major platforms—Polymarket, Kalshi, and Betfair—have priced this market conservatively. Kalshi's strict KYC requirements and US-focused liquidity pools often show lower trading volumes on international preliminary fights compared to Betfair's European user base, creating occasional odds divergence.

Traders should monitor official UFC injury reports and weigh-in results from 5–6 June. Duben's recent fight history and any public statements about training camp completion will signal bout viability. The settlement window closes 7 June at 03:59 UTC, allowing resolution within hours of fight conclusion. No official announcement of cancellation has been issued as of late May 2026, though preliminary card confirmation typically occurs only days before the event.

Methodology

This page compares UFC Fight Night: Yuneisy Duben vs. Jeisla Chaves (Women's Flyweight, Prelims) specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket 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

Where can I trade this market with the lowest fees?

On Polymarket Alternative, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.