Houston Astros vs. Minnesota Twins

Platform comparison

Active sub-markets

Market context

Houston and Minnesota complete their three-game series on 20 May, with the first two games already split. The latest scoreline in the series was a 2-1 Astros win, while Minnesota took the opener 6-3, leaving the rubber game to decide the set. That matters because the market’s 0% Yes price is far below the on-field picture: ESPN and sportsbook listings had Minnesota modest favourites for the finale, with the Twins around -179 and Houston about +159 on the moneyline, implying a much closer contest than the market suggests.

Recent results also point away from a clean Astros win. Houston entered the series at 20-30 and had lost the opener before edging the second game, while Minnesota had been roughly .500 and stronger at home, where it had a positive record. Across comparable MLB spot prices, a team priced as a road underdog can still win, but a 0% crowd-implied probability is normally reserved for mispriced or stale markets rather than a live game with an active line. For a USDC-settled contract, the key point is that settlement follows the official final result, so even a late swing in in-game price will not matter once the box score is final.

Traders should watch the listed starters and any late lineup changes close to first pitch at 1:40pm ET, as those are the main drivers of the moneyline and total. ESPN’s game page had Houston’s Mike Burrows and Minnesota’s starting pitcher reflected in the odds board, which is the clearest pre-game dependency. Any postponement would keep the market open until completion, while a cancellation or tie would settle 50-50 under the rules. Because this is a dated MLB game rather than a crypto-native event, BTC and ETH spot action is only indirectly relevant unless broader risk sentiment is spilling into prediction-market liquidity.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

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.

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 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.