What does 55¢ mean on Kalshi or Polymarket?
ThinBlimp guide · facts checked October 17, 2026 · nothing here is advice
A prediction-market price is the market's chance that something happens, written in cents. A contract that pays $1 if the outcome happens and nothing if it doesn't trades at 55¢ when the market thinks the outcome is about 55% likely.
What you win and lose
You buy one YES contract at 55¢.
- If the outcome happens, the contract pays $1. Your profit is 45¢.
- If it doesn't, the contract pays nothing. You lose the 55¢.
The NO side is the mirror: it costs about 45¢ and pays $1 if the outcome does not happen. Prices move all day as people trade, and you can sell a contract before it settles at whatever the market will pay for it then.
55¢ in sportsbook odds
The same chance can be written three ways. At 55¢:
- Implied probability: 55%.
- American odds: −122. A 45¢ contract is +122, and 50¢ is even money, +100.
- Decimal odds: 1.82.
The odds converter does this for any price, both directions.
Why YES and NO add up to more than $1
The price on each button is what you can buy at, the ask. If YES shows 55¢ and NO shows 46¢, the two asks add up to $1.01. The extra cent is the spread: the gap between what buyers are bidding and what sellers are asking. A tight, busy market has a spread of a cent; a quiet one can be several.
The fee moves your break-even
Buying at the ask pays a taker fee. Kalshi's fee is 0.07 × contracts × price × (1 − price), rounded up to the cent on each order, so it is largest at 50¢ and shrinks toward the ends. On 100 contracts at 55¢ that is $1.74, or 1.74¢ a contract, which makes your real price 56.74¢. You have to be right about 56.7% of the time just to break even, not 55%.
| Price | American odds | Kalshi taker fee, per contract on 100 | Break-even win rate |
|---|---|---|---|
| 10¢ | +900 | 0.63¢ | 10.63% |
| 25¢ | +300 | 1.32¢ | 26.32% |
| 50¢ | +100 | 1.75¢ | 51.75% |
| 75¢ | −300 | 1.32¢ | 76.32% |
| 90¢ | −900 | 0.63¢ | 90.63% |
Because Kalshi rounds each order's fee up to the next cent, a small order pays a little more per contract than the table shows. Polymarket's fee uses the same shape with a rate set by category, and Polymarket US uses one rate for every market; the fee calculator and the break-even calculator work out any trade on all three. A resting limit order usually pays no fee at all; see limit orders vs buying the ask.
Is the price right?
On the sports markets we have measured, mostly yes. Across thousands of settled Kalshi game contracts, outcomes happened about as often as their price the day before the game said they would, band by band, and the price forecast as well as the sharpest sportsbook. The study is in our research. That does not make any single price correct; it means the price is a fair summary of what the market knows.
Questions
What does 55¢ mean on Kalshi?
The market puts the outcome at about a 55% chance. You pay 55¢ for a contract that pays $1 if it happens, so you profit 45¢ if you are right and lose 55¢ if you are wrong.
What is 55¢ in American odds?
55¢ is about −122 in American odds, and 45¢ is about +122. 50¢ is even money (+100).
Why do YES and NO add up to more than $1?
Each side shows the price you can buy at, its ask. The two asks add up to a little over $1, and the difference is the spread between buyers and sellers.
How often do I need to be right at 55¢?
More than 55% of the time, because the fee raises your real price. On Kalshi, 100 contracts at 55¢ carry a $1.74 taker fee, 1.74¢ a contract, so you need to win about 56.7% of the time to break even.