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MLB: RBIs Leader

Which venue prices "MLB: RBIs Leader" best? Direct comparison of Polymarket, Kalshi, Betfair and Smarkets.

CJ Abrams 35% Pete Alonso 34% Junior Caminero 34% Yordan Alvarez 23% Volume: $1.6M Liquidity: $20K Closes: 28 Sept 2026
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MLB: RBIs Leader

Platform comparison

PlatformYES oddsNO oddsFeeKYCSettlement
Polymarket (via Kalshi Alternative UK) Pick
polygram.ink (preferred broker)
 35% 65% 0% (USDC on-chain) No-KYC up to $1,500 USDC, auto via UMA oracle Trade this market →
Polymarket (direct)
polymarket.com
 35% 65% 0% Geo-blocked in US/UK/EU USDC, on-chain Trade this market →
Kalshi
kalshi.com
 — — Up to 7% per trade US-only, KYC required USD Trade this market →
Betfair Exchange
betfair.com
 — — 2-5% commission Full KYC from first trade GBP / EUR Trade this market →
Manifold Markets
manifold.markets
 — — Play-money (mana) None — play-money Mana (no cash-out) Trade this market →

Outcome probabilities

Current market-implied probability for each outcome, from the live order book.

OutcomeProbability
CJ Abrams35%
Pete Alonso34%
Junior Caminero34%
Yordan Alvarez23%
Kyle Schwarber9%
Andy Pages3%
Liam Hicks2%
Brandon Lowe2%
Cal Raleigh1%
Aaron Judge1%
Riley Greene1%
Rafael Devers1%
Juan Soto1%
Taylor Ward1%
James Wood1%
Sal Stewart1%
Drake Baldwin1%
Eugenio Suárez0%
Vinnie Pasquantino0%
Christian Yelich0%
Seiya Suzuki0%
Bo Bichette0%
Nico Hoerner0%
Oneil Cruz0%
Jorge Soler0%
Player A0%
Player B0%
Player C0%
Player D0%
Player E0%
Player F0%
Player G0%
Player H0%
Player I0%
Player J0%
Player K0%
Player L0%
Player M0%
Player N0%
Player O0%
Player P0%
Player Q0%
Player R0%
Player S0%
Player T0%
Player U0%
Player V0%
Player W0%
Player X0%
Player Y0%
Player Z0%
Player AA0%
Player AB0%
Player AC0%
Player AD0%
Player AE0%
Player AF0%
Player AG0%
Player AH0%
Player AI0%
Player AJ0%
Player AK0%
Player AL0%
Player AM0%
Player AN0%
Player AO0%
Player AP0%
Player AQ0%
Player AR0%
Player AS0%
Other0%

Market context

MLB: RBIs Leader — current market-implied probability: 35%. This market will resolve according to the player who records the most runs batted in (RBIs) during the 2026 Major League Baseball regular season. In the event of a tie, this market will resolve accor…

Methodology

This page compares MLB: RBIs Leader specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

What does Polymarket cost vs Kalshi?
Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.
Is Betfair a Polymarket alternative?
Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.
What about Smarkets as an alternative?
Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.
Are all these platforms regulated?
No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.
Which platform supports Klarna/SOFORT?
Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative UK offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.
Emma RobertsEmma RobertsFinancial JournalistandSarah MitchellSarah MitchellPolitical Markets Writer

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