What are market makers?
Every time you trade on Kalshi, someone is on the other side, and often that someone is a market maker. Understanding what they do explains a lot about why prices and spreads behave the way they do.
Here is the concept, and what it means for you.
What a market maker does
A market maker continuously posts both a buy price (bid) and a sell price (ask), standing ready to trade either side. By keeping resting orders in the book, they provide the liquidity that lets other traders get filled quickly. On Kalshi, anyone who rests limit orders on both sides is, in effect, making a market.
How they profit
Their core edge is the spread: they buy slightly below fair value and sell slightly above it, earning the difference across many trades. They are not trying to predict the event so much as to capture the gap between bid and ask repeatedly while staying roughly neutral on the outcome.
The risks they manage
Making markets is not free money. They carry inventory risk if the price moves against the position they are holding, and adverse-selection risk when better-informed traders pick them off right before news. Good market makers price the spread wide enough to cover those risks and adjust constantly as conditions change.
What it means for you
Market makers are why liquid markets have tight spreads and why you can usually get filled near the quote. In thin markets with few makers, spreads widen and execution gets worse. Knowing this helps you read a book: a tight, deep book usually means active makers, and a wide, sparse one means you are more on your own.