MLB: RBIs Leader

Platform comparison

Market context

The real-world event this market tracks is which Major League Baseball player accumulates the most runs batted in during the 2026 regular season, ending in late September. A YES share on a specific player means you believe that individual will finish as the official RBI leader; if correct, each share redeems for £1. A NO share means you believe they will not win. In this specific market, the crowd currently assigns only a 9% chance to the leading candidate, Yordan Alvarez, indicating a highly fragmented race where no single player dominates the probability.

Historically, RBI leader races often remain wide open until the All-Star break, with longshots rarely winning unless multiple favourites suffer injuries or slump late. Last season, Cal Raleigh and Kyle Schwarber led the odds at different points before the final tally, showing how volatile these markets can be [1][3]. The current 9% implied probability for Alvarez aligns with past seasons where the eventual winner held similar low odds mid-year, suggesting the market correctly prices in the uncertainty of a 85-day remaining schedule rather than locking in a premature favourite [5].

Traders should monitor daily lineup announcements, injury reports, and the All-Star break schedule, as these directly impact a player’s opportunity to accumulate RBIs. Recent betting odds from major sportsbooks list Aaron Judge as the outright favourite with +450 odds, implying an 18% chance, which contrasts sharply with the 9% crowd price on Alvarez and signals a potential divergence between traditional bookmakers and prediction market traders [1][3]. Key catalysts include any mid-season roster moves or confirmed rest periods for top sluggers, which could rapidly shift probabilities as the season approaches its final stretch.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track MLB: RBIs Leader across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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.

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 Prediction Market UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.