Washington Nationals vs. Tampa Bay Rays

Platform comparison

Active sub-markets

Market context

Polymarket is pricing this Washington Nationals–Tampa Bay Rays contract at **0% YES** today, which means the market is effectively saying there is no meaningful chance of a Nationals win under the current order book. Because the settlement is a binary USDC contract on Polygon, the live price reflects traders’ willingness to hold conditional tokens tied to the official final result, not a bookmaker-style line; at zero, even a small buy can move the displayed probability sharply if liquidity is thin.

That reading should be set against the immediate game context: the Rays already took the first game of the series on 19 June, and the 20 June matchup is listed by MLB and live-score services as a scheduled 4:10 pm EDT start, with a separate 21 June listing also appearing on ESPN, which is a reminder that traders need to check for schedule changes or a make-up booking if weather intervenes.[1][2][5][6] In comparable MLB markets, zero-priced sides usually indicate either a heavy mismatch, stale liquidity, or a position that has been driven to the floor by active selling; that makes the on-chain depth more important than the headline percentage.

For anyone watching the contract into settlement, the key catalysts are straightforward: any official postponement, cancellation, or doubleheader adjustment from MLB or the teams; any late lineup or pitching changes that shift pre-game expectations; and the final box score, since the market resolves on official result only.[2][3][5] If the game is played to completion, the token pays out according to the winner; if it is cancelled without a make-up, or ends in a tie, it resolves 50-50 under the market rules.

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 Kalshi UK, which mirrors the Polymarket order book directly.

Resolution & payout

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 Kalshi 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.

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 Kalshi UK?

Zero. Kalshi UK 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.