What is the fee on Kalshi for this market?

At the current typical price of 6¢, about 0¢ per contract (7% × price × (1 − price), rounded up, on orders that take liquidity). On a $50 trade that is about $3.27.

What win rate do I need to break even?

About 7% if you hold to settlement, against a market price of 6%. The gap is the fee.

Markets › Kalshi › Science and Technology

Polio cases USA on Kalshi

If there are above 0 cases of polio in the United States in 2026, then the market resolves to Yes.

Settles on: Fox News, MSNBC, The Wall Street Journal, Semafor, ABC, The Information, CBS, the National Institutes of Health, The New York Times, Axios, CNN, Reuters, Centers for Disease Control and Prevention, The Washington Post, the Associated Press, Politico.

Market says (typical open contract)

Median YES price across 1 open contract, 10 Nov 2026 09:57 UTC.

Real-world odds

—

No independent base rate yet. Until we connect one (sportsbook consensus, forecasts, the score), the market's own price is the best public forecast, and the fee sits on top of it.

Luck needed meter

13% 😈

Mostly decided, says the market. You are paying a fee to collect a few cents the market already agrees on.

The cover charge

Fee and break-even by purchase price
If you buy at	Fee per contract	On $50	Win rate to break even
7¢ (now)	0.5¢	$3.25	7.5%
30¢	1.5¢	$2.45	31.5%
50¢	1.8¢	$1.75	51.7%
70¢	1.5¢	$1.05	71.5%
90¢	0.6¢	$0.35	90.6%

Resting orders pay no fee on this series. Formula: 7% × contracts × price × (1 − price), rounded up, on orders that take liquidity. Break-even assumes you hold to settlement; trading out early pays the fee twice.

How long until your balance is $0 in this market? →

Open contracts right now

Open contracts in this series with price, implied probability, volume and close time
Contract	YES price	Implied	Fee at this price	Real-world odds	Luck needed	Volume	Closes
Will there be a case of polio in the USA this year? · In 2026	6¢	6%	0.4¢	—	13%	13,913	Jan 31, 15:00 UTC

Who actually wins this market

Whoever posts the resting orders and collects the spread without paying a fee.
The venue, on every fee.
Not, on average, the person clicking buy because the chart is going their way. That was us.

Still want to play? Read the deal first: what the account asks for, what the bonus really is, and whether we are paid. Vendors sell bots for markets like this one; see the bot benchmark before you pay for one.