No MLB props are priced by both Kalshi and Hard Rock Bet at this moment. Prices repopulate as each slate's boards open.
How they differ
Kalshi is an exchange: traders set the price between themselves and the fee sits outside it. Hard Rock Bet is a sportsbook: it posts its own line and keeps its margin inside the two prices. Which of them is cheaper is not a constant and is not something this page asserts: every prop Kalshi and Hard Rock Bet both price right now is converted to the implied probability of the same outcome and counted below, so the answer moves with the two boards rather than with the date this page was written.
Where Kalshi is cheaper
Counted above: every prop Kalshi prices lower than Hard Rock Bet. Listed below: the ones that also beat a de-vigged fair price, which is the stricter test and the only one worth acting on.
Kalshi is not currently beating fair value on any MLB props both venues list.
How each one charges
- Kalshi
- Kalshi is a CFTC-regulated exchange. Every contract settles at $1 or $0, so a 42¢ quote is a 42% implied probability with no sportsbook margin layered on top.
- Kalshi charges a per-contract trading fee instead of building a margin into the line. The fee is a curve, not a flat rake: it peaks at roughly 1.75¢ on a contract priced near 50¢ and shrinks toward zero at both extremes, and maker fees are a quarter of taker fees.
- Kalshi lists player markets as "X or more" yes/no contracts rather than as an over/under line, so BeatVig converts each contract to the equivalent over price before comparing it to a sportsbook number.
- Hard Rock Bet
- Hard Rock Bet is a traditional sportsbook: it posts its own line and prices both sides with its margin included, taking the other side of your bet itself rather than matching you against another user.
- Hard Rock Bet's margin sits inside the two prices rather than arriving as a separate commission, so it is paid on every bet whether that bet wins or loses. How much of a given price is margin varies by market — convert both sides to implied probability and the amount they total above 100% is what the book is charging.
- Hard Rock Bet carries one of the deepest player-prop menus of any venue on this site, listing the full passing, rushing and receiving spread across the slate rather than only the headline markets.
In short
Kalshi and Hard Rock Bet are not currently pricing any of the same MLB props at this moment; a percentage will appear here once both venues quote something in common.
Kalshi vs Hard Rock Bet FAQ
Is Kalshi cheaper than Hard Rock Bet?
It depends on the prop, which is why this page measures it continuously rather than quoting a single number. Neither venue is cheaper on everything, and the answer changes as both boards move.
How do you compare a Kalshi price to a Hard Rock Bet price?
Every quote from both venues is converted to the implied probability of the same outcome, so a contract price and an American price become the same unit. The cheaper venue is the one implying the lower probability for the side you want.
What does Kalshi charge?
Kalshi charges a per-contract trading fee instead of building a margin into the line. The fee is a curve, not a flat rake: it peaks at roughly 1.75¢ on a contract priced near 50¢ and shrinks toward zero at both extremes, and maker fees are a quarter of taker fees.
What does Hard Rock Bet charge?
Hard Rock Bet's margin sits inside the two prices rather than arriving as a separate commission, so it is paid on every bet whether that bet wins or loses. How much of a given price is margin varies by market — convert both sides to implied probability and the amount they total above 100% is what the book is charging.
How often does this comparison update?
It is computed from the live board every time the page loads, so it reflects the prices both venues are showing at that moment rather than a snapshot taken on an earlier day.