AFC Ajax vs. FC Groningen

Platform comparison

Active sub-markets

Market context

Ajax meet FC Groningen in the Eredivisie Europa play-off semi-final, with the game listed for 21 May at 16:45 UTC. The market is currently priced at 100% YES, which is materially firmer than the sportsbook and analyst picture reflected in the search results: bookmakers have Ajax only as moderate favourites, while model-based previews put Ajax around 58% to 53% to win. That gap matters because the contract is not behaving like a standard 1x2 price; it is closer to a binary event outcome, where the market is effectively treating the fixture as a near certainty even though the public odds still allow for upset risk.

Historical and comparable readings are less one-sided. FootyStats notes the sides’ last meeting finished Ajax 2-0 Groningen, but its own odds snapshot still had Ajax only marginally ahead, and prediction sites this week have leaned towards Ajax without suggesting a blowout. RatingBet’s model gives Ajax a 58% away win chance, with a 23% draw and 19% home win chance, while SportsGambler describes Ajax as favoured but far from unbackable. For traders, the main catalysts are team news and line-ups close to kick-off, plus any late confirmation on venue and competition format, because these play-off ties can shift sharply if Ajax rotate, rest key players, or if Groningen’s selection is stronger than expected.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track AFC Ajax vs. FC Groningen 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 PolyGram, 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?

PolyGram 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.

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 PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.