UFC Fight Night: Karol Rosa vs. Luana Santos (Women's Bantamweight, Prelims)

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Active sub-markets

Market context

Karol Rosa faces Luana Santos in a women’s bantamweight prelim at UFC Fight Night, with official UFC judging the only settlement source for the market. The listed time props point to Rosa as the betting favourite on the fight itself, while Tapology and UFC-related listings place the bout on the preliminary card in Las Vegas and frame it as a standard three-round, 135 lb contest.[1][2][7]

A 0% YES crowd-implied probability is best read as a pricing outlier rather than a statement that the result is impossible. Santos is the younger fighter and comes in with a UFC-record profile that shows a 11-2-0 record and strong grappling metrics, while Rosa has the more established UFC name and a broader body of top-level experience.[4][7][9] For comparison purposes, this is the sort of women’s bantamweight pairing where late line movement can be driven by weigh-in reads, short-notice replacements, or a late injury/medical scratch; a cancellation, no contest, or postponement beyond the market’s cut-off would push resolution to 50-50 instead of either fighter.[2]

For traders, the main catalysts are official UFC bout status, weigh-in confirmation, and whether the prelim remains intact on the final fight card. The event is scheduled for 20 June 2026, so any commission, broadcast, or medical changes before then matter more than speculation about form or style.[2][6] On the access side, German GlüStV rules can make some betting-style products materially harder to use from Germany, US CFTC jurisdiction can affect whether a market is treated as a regulated derivatives product in the United States, and “no-KYC up to $1,500” usually means smaller participation without full identity checks, not unrestricted access for every user or region.

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

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.

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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.

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.