CD Castellón vs. SD Eibar

Platform comparison

Active sub-markets

Market context

CD Castellón will face SD Eibar in La Liga 2 on 31 May 2026, the final day of the regular season. Both clubs compete in Spain's second tier, where promotion and playoff qualification often hinge on closing fixtures. The 100% implied probability across prediction markets suggests settlement hinges on match occurrence rather than outcome uncertainty, indicating the fixture is expected to proceed as scheduled with no material doubt about whether it takes place.

Historical precedent from La Liga 2 final-day fixtures shows that cancellations or postponements are rare once the season reaches its conclusion, though administrative or force-majeure events have occasionally affected scheduling. The current probability reflects confidence in fixture stability rather than predictive certainty about either side's performance. Comparable end-of-season matches in Spanish football have settled reliably when both clubs remain active in the league structure, which both Castellón and Eibar are positioned to do.

Traders should monitor team news through May, particularly injury or suspension announcements affecting squad availability, though these would not affect whether the match occurs. Fixture confirmation from La Liga's official schedule and any league-wide scheduling changes warrant attention. The settlement window closes at 16:30 UTC on match day, allowing for standard post-match verification. Current sportsbook lines on match outcome (win/draw/loss) show typical La Liga 2 spreads, but this contract's 100% probability reflects administrative certainty rather than betting consensus on either team's chances.

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

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 Best Prediction Markets 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.

Is this market available outside the US?

Best Prediction Markets UK 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, Best Prediction Markets UK triggers a quick verification flow that finishes in minutes.