CD Castellón vs. SD Eibar

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Market context

CD Castellón will host SD Eibar on Sunday, 31 May 2026 in a La Liga 2 fixture. The Polymarket contract currently settles at 100% YES, indicating traders have priced the match as certain to occur as scheduled. This reflects the standard assumption that the fixture will proceed without cancellation, postponement, or administrative intervention—the only conditions under which the YES outcome would fail to resolve.

Castellón and Eibar occupy different tiers of Spanish football's second division by recent form and infrastructure. Eibar, a club with established La Liga history and stronger financial backing, typically commands higher odds in head-to-head markets. Castellón, based in the Valencian Community, has experienced volatility in league position and managerial changes. Historical fixture data between these sides shows competitive matches, though Eibar's superior squad depth has often translated to favourable results. The 100% probability on match occurrence itself—rather than outcome—suggests traders view fixture cancellation risk as negligible at this settlement window distance.

Traders monitoring this contract should track La Liga 2's official fixture calendar through May, particularly any announcements regarding scheduling conflicts or force majeure events. Weather disruptions affecting the Valencian region in late May remain a minor consideration. Stadium availability at Castellón's Estadio Castalia and any late-season administrative issues within the Spanish Football Federation could theoretically trigger postponement. Settlement occurs at 16:30 UTC on 31 May, aligning with typical Spanish Sunday kick-off times. USDC deposits on Polygon remain locked until resolution, so position sizing should account for the five-month holding period.

Methodology

We track CD Castellón vs. SD Eibar on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

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.

What does it cost to trade on Polymarket UK?

Zero. Polymarket 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.