UFC Fight Night: Melissa Mullins vs. Bia Mesquita (Women's Bantamweight, Prelims)

Platform comparison

Active sub-markets

Market context

On Saturday 20 June 2026 at the Meta APEX in Las Vegas, Bia Mesquita, a 35-year-old undefeated bantamweight with a 7-0 professional record, will face Melissa Mullins in a women’s bantamweight prelims bout. Mesquita enters as the clear betting favourite with -650 UFC odds, while Mullins, coming off a recent setback, is the +425 underdog[1][2]. The market in question resolves to “Melissa Mullins” if she wins, “Bia Mesquita” if she wins, and 50-50 in the event of a draw, no contest, cancellation, or postponement beyond 4 July 2026[4].

Historically, similar underdog markets in UFC prelims have seen crowd-implied probabilities drop sharply when one fighter holds a perfect record and significant odds advantage, as seen in this case where the YES probability for Mullins is currently 0%[1]. Comparable cases from past UFC Fight Nights show that when a fighter like Mesquita carries both a flawless record and heavy odds backing, the market often treats the underdog’s win as virtually improbable until new information emerges, such as injury reports or weight-cut issues[2].

Traders should monitor official UFC announcements regarding fight status, referee assignments, and any late changes to the bout schedule, as these can trigger market resets or early settlements[5]. Recent fight announcements confirm the bout is scheduled for 5:00 PM ET on 20 June, with referee Mike Beltran assigned[5]. Any delay beyond two weeks would keep the market open until the rescheduled fight concludes, per Kalshi’s rules[4]. For accessibility, German GlüStV permits no-KYC trading up to €1,500, while US CFTC reach allows similar thresholds under $1,500, enabling broader participation without identity verification for this specific market.

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). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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?

On Polymarket Tax UK, 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.

What does it cost to trade on Polymarket Tax UK?

Zero. Polymarket Tax UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.

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.