MLB: RBIs Leader

Platform comparison

Market context

The 2026 MLB regular season is nearing its conclusion, with traders assessing which batter will accumulate the most runs batted in before the final whistle on 28 September. Current crowd-implied probability sits at 9% for the YES outcome on Yordan Alvarez leading the league, marking him as the statistical favourite despite the race remaining exceptionally wide open. While consensus betting sites like BetMGM list Aaron Judge as the outright favourite with 18% implied odds, the prediction market shows a fragmented field where Alvarez and Kyle Schwarber are separated by just 1%, suggesting the crowd has not yet locked into a single dominant narrative [1][5].

Historical RBI races often see late-season slumps or injuries derail early leaders, with struggling players falling out of contention after the All-Star break as top performers maintain their output [2]. The 9% probability for Alvarez reflects a market that views the outcome as unlikely but plausible, contrasting with traditional futures where Judge holds a clear edge; this divergence creates a potential value spot for contrarian traders who believe Alvarez’s power surge can withstand the final two months of the schedule [3][5].

Key catalysts include monitoring Alvarez’s health and daily lineup status, as late-season benchings for postseason rest frequently cap RBI totals for top contenders [2]. Traders should also watch for any sudden shifts in Schwarber’s performance, given his proximity in the odds, and verify if Judge’s injury history impacts his remaining games, as a single missed week could alter the leaderboard significantly [2][3]. With $1.4M already traded and 85 days remaining, conviction prices will shift rapidly if new information emerges regarding player availability or performance trends [5].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win, 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

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.