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

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Market context

Karol Rosa meets Luana Santos on the UFC Fight Night prelims in a women’s bantamweight bout that is scheduled to be settled by the UFC’s official result, not by any sportsbook or third-party scoreline. Tapology and Sofascore both list the matchup for UFC Fight Night: Kape vs. Horiguchi, and UFC statistics pages show Santos at 10-2 entering the fight.[1][3][8]

A 0% YES price implies the market is treating a Rosa win as effectively off the table, which is extreme for a live MMA contract because the outcome still depends on the official result, and anything from a Santos decision to a late change in the bout status can move settlement to a different branch. UFC.com has framed Santos as a win away from the women’s bantamweight top 10, which is a useful clue that the promotion expects competitive stakes rather than a routine showcase, and weigh-in coverage indicated Santos made weight at 136 pounds.[5][2]

For traders, the immediate catalysts are the walkout status, any late commission or UFC scheduling change, and whether the bout is completed and scored on the card as planned before the settlement window closes. In a crypto-native market, the contract should still resolve on the UFC’s official declaration, but the 0% price means liquidity may be thin and slippage can be sharp if pre-fight news, cage-side injury reports, or a last-minute cancellation hits the feed first.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads UFC Fight Night: Karol Rosa vs. Luana Santos (Women's Bantamweight, Prelims) on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed for comparison. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Is this market available outside the US?

BTC Prediction is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, BTC Prediction 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.