Detroit Tigers vs. Baltimore Orioles

Platform comparison

Active sub-markets

Market context

Detroit and Baltimore meet in an AL regular-season game with the market currently pricing the Tigers at 45% to win, which makes Baltimore a narrow implied favourite. That kind of mid-40s line usually reflects a fairly even matchup rather than a strong opinion, and in MLB those prices can move sharply on late pitching news, bullpen availability or a line-up scratch. For a handicapper, the key question is whether the crowd has over-weighted home field and recent form, or whether the underdog is sitting at a genuinely mispriced number.

The recent frame from Baltimore is mixed rather than reassuring: MLB.com reported the Orioles were swept by Detroit in one series last week, ending a long run of series without being swept. That does not decide a rematch, but it does show Detroit has already handled this opponent recently, which can matter in short-run market perception. Comparable spots in baseball often come down to whether the earlier result was driven by a one-off pitching edge or a broader match-up edge that repeats.

The main catalysts to watch are the starting pitchers, any pre-game rest decisions, and bullpen usage from the previous two or three days, because those are the factors most likely to shift a 45% ticket into value or away from it. The game is scheduled for May 22 at 7:15pm ET, and any late change in the listed starter would be the most obvious market mover. Baltimore’s status as the slight consensus side means contrarian interest tends to sit with Detroit if the Tigers get a favourable mound matchup or if the Orioles are missing regulars.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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.

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 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.