1. FSV Mainz 05 vs. 1. FC Union Berlin

Platform comparison

Market context

Mainz and Union Berlin will contest a Bundesliga fixture on 10 May 2026, with settlement determined by the match result at the Opel Arena. The 1% implied probability reflects either a heavily skewed market view or sparse liquidity; historical Bundesliga matchups between mid-table sides typically see 25–35% probability assigned to the away team in neutral circumstances, suggesting this market may be pricing an extreme outcome or suffering from thin order books.

Union Berlin's recent form and fixture congestion warrant close monitoring. The club's European commitments and injury status in April–May often determine their league performance; conditional orders keyed to UEFA competition results or official team news could capture material probability shifts. Mainz's home record and squad rotation patterns similarly merit tracking through official Bundesliga communications and club announcements in the weeks preceding settlement.

For programmatic evaluation, this market's utility hinges on data availability and execution speed. A trader building a bot would need to integrate fixture confirmations, team-sheet releases (typically 90 minutes pre-match), and real-time odds feeds to identify mispricing relative to historical win-rate models. The 1% quote suggests either genuine edge detection or illiquidity; backtesting against comparable Mainz home matches and Union away performances across recent seasons would establish whether the current price reflects genuine predictive value or merely thin participation.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Resolution source: This market settles from the official publication at https://www.bundesliga.com/en/bundesliga. A proposer submits the result to the UMA Optimistic Oracle on Polygon, the two-hour challenge window opens, and the smart contract pays out in USDC.

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

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.

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 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.