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

Platform comparison

Active sub-markets

Market context

Karol Rosa and Luana Santos are scheduled to meet in a women’s bantamweight prelim at UFC Fight Night in Las Vegas, and the market settles on the official UFC result: Rosa, Santos, or 50-50 if the bout ends as a draw, no contest, cancellation, or postponement beyond the market’s cutoff. Tapology lists the bout on the prelims at 135 pounds, while UFC statistics identify Santos as an active bantamweight with a 11-2 record and a 135-pound listed weight class.[2][4]

A 0% YES crowd price is most consistent with a market that has already seen the fight outcome or with a stale listing that traders have not repriced yet, so it should be read cautiously rather than literally as an ex ante forecast. Comparable pre-fight pricing from FanDuel had Rosa as a clear favourite at around -600, with Santos at +380, which frames the contest as one with a structurally lower probability of a Santos upset than the market’s 0% implies.[1] If the official UFC result has already been posted elsewhere, the binary market should track that, not the sportsbook line.

For accessibility, German GlüStV treatment matters because the event is a sports outcome market, which may be classified differently from fixed-odds betting depending on platform structure; US CFTC reach is relevant because US persons can face commodities-law exposure if the market is treated as a derivatives-style contract. “No-KYC up to $1,500” means a user may be able to trade without full identity verification until cumulative activity reaches that threshold, but it does not remove local jurisdictional restrictions or limit the need for the market to settle from official UFC information. The main catalysts are the official weigh-in, any late replacement or cancellation notices, and post-fight UFC bout-result publication.

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 Legal 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.