Strikeouts o3.5
Kalshi
+257 vs
Hardrock
+185
+7.08%
edge
How Kalshi prices MLB
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.
Each card below names the market, the line and both prices, so you can see the gap before you take it.
MLB edges
Where Kalshi is the better number right now.
Strikeouts o4.5
Kalshi
+733 vs
Hardrock
+425
+7.04%
edge
Strikeouts o8.5
Kalshi
+194 vs
Hardrock
+150
+5.99%
edge
Strikeouts o8.5
Kalshi
+426 vs
Hardrock
+300
+5.99%
edge
Strikeouts o8.5
Kalshi
+1329 vs
Hardrock
+700
+5.5%
edge
Total Bases o3.5
Kalshi
+669 vs
Hardrock
+450
+5.18%
edge
Total Bases o3.5
Kalshi
+567 vs
Hardrock
+400
+5.01%
edge
Strikeouts o4.5
Kalshi
+335 vs
Hardrock
+260
+4.79%
edge
Total Bases o2.5
Kalshi
+426 vs
Hardrock
+325
+4.52%
edge
Hits o1.5
Kalshi
+426 vs
Hardrock
+325
+4.52%
edge
Strikeouts o9.5
Kalshi
+809 vs
Hardrock
+550
+4.38%
edge
Strikeouts o9.5
Kalshi
+1011 vs
Hardrock
+650
+4.33%
edge
Total Bases o3.5
Kalshi
+900 vs
Hardrock
+600
+4.29%
edge
Strikeouts o5.5
Kalshi
+186 vs
Hardrock
+155
+4.25%
edge
Total Bases o2.5
Kalshi
+567 vs
Hardrock
+425
+4.06%
edge
Rbis o1.5
Kalshi
+567 vs
Hardrock
+425
+4.06%
edge
Strikeouts o2.5
Kalshi
-178 vs
Polymarket Us
-213
+4.02%
edge
Hits o1.5
Kalshi
+525 vs
Hardrock
+400
+4.0%
edge
Hits o2.5
Kalshi
+733 vs
Hardrock
+525
+4.0%
edge
Total Bases o3.5
Kalshi
+376 vs
Polymarket Us
+300
+3.99%
edge
Strikeouts o4.5
Kalshi
+270 vs
Hardrock
+225
+3.74%
edge
Strikeouts o5.5
Kalshi
+335 vs
Hardrock
+275
+3.68%
edge
Strikeouts o9.5
Kalshi
+335 vs
Hardrock
+275
+3.68%
edge
Total Bases o2.5
Kalshi
+335 vs
Hardrock
+275
+3.68%
edge
Rbis o1.5
Kalshi
+335 vs
Hardrock
+275
+3.68%
edge
Total Bases o4.5
Kalshi
+1329 vs
Hardrock
+850
+3.53%
edge
Strikeouts o10.5
Kalshi
+1329 vs
Hardrock
+850
+3.53%
edge
Total Bases o2.5
Kalshi
+400 vs
Hardrock
+325
+3.53%
edge
Total Bases o1.5
Kalshi
+223 vs
Hardrock
+190
+3.52%
edge
Strikeouts o10.5
Kalshi
+614 vs
Hardrock
+475
+3.39%
edge
Strikeouts o5.5
Kalshi
+733 vs
Hardrock
+550
+3.38%
edge
Rbis o1.5
Kalshi
+733 vs
Hardrock
+550
+3.38%
edge
Strikeouts o1.5
Kalshi
-1900 vs
Hardrock
-6000
+3.36%
edge
Rbis o1.5
Kalshi
+900 vs
Hardrock
+650
+3.33%
edge
Rbis o1.5
Kalshi
+900 vs
Hardrock
+650
+3.33%
edge
Strikeouts o8.5
Kalshi
+900 vs
Hardrock
+650
+3.33%
edge
Rbis o1.5
Kalshi
+900 vs
Hardrock
+650
+3.33%
edge
Total Bases o1.5
Kalshi
+233 vs
Betrivers
+200
+3.3%
edge
Strikeouts o3.5
Kalshi
+178 vs
Hardrock
+155
+3.25%
edge
Rbis o0.5
Kalshi
+257 vs
DraftKings
+220
+3.24%
edge
Strikeouts o4.5
Kalshi
+426 vs
Hardrock
+350
+3.21%
edge
Hits o1.5
Kalshi
+426 vs
Hardrock
+350
+3.21%
edge
Rbis o1.5
Kalshi
+567 vs
Hardrock
+450
+3.19%
edge
Total Bases o4.5
Kalshi
+1150 vs
Hardrock
+800
+3.11%
edge
Hits o1.5
Kalshi
+245 vs
Polymarket Us
+212
+3.07%
edge
Total Bases o3.5
Kalshi
+525 vs
Hardrock
+425
+3.05%
edge
Rbis o1.5
Kalshi
+525 vs
Hardrock
+425
+3.05%
edge
Total Bases o1.5
Kalshi
+194 vs
Onexbet
+170
+3.02%
edge
Hits o1.5
Kalshi
+355 vs
Hardrock
+300
+3.02%
edge
Rbis o1.5
Kalshi
+567 vs
Polymarket Us
+456
+2.99%
edge
Kalshi MLB props — FAQ
Does Kalshi offer MLB player props?
Yes. BeatVig is pricing MLB player props on Kalshi right now, and the board above lists the ones where Kalshi is the cheaper side of the market.
Is Kalshi cheaper than a sportsbook on MLB props?
Often, because Kalshi charges its fee separately instead of building a margin into the line. It is not cheaper on every prop, so the comparison is worth making per market rather than assuming it.
How do Kalshi's costs compare to sportsbook vig?
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.
How do you compare a Kalshi price to another venue's?
Convert both quotes to the implied probability of the same outcome, which puts a contract price and an American price in the same unit. The cheaper venue is the one implying the lower probability for the side you want.