LEARN · GUIDE
Kalshi strategy claims, checked against the tape.
Most Kalshi strategy content survives until it meets the tape. Edge can exist in three places, information, models, and execution, but every trade pays a spread and a taker fee before any of it counts. This guide sets out the arithmetic and the published research. It describes; it does not advise.
Where edge can exist in principle
In principle a trader can beat a price in 3 ways. Information: knowing something the market has not priced, the way a scratch or an injury reaches some sports traders early. Models: estimating probabilities better than the crowd across many markets, which shows up as calibration over hundreds of positions rather than any single win. Execution: being the resting side of the book, collecting the spread and paying the reduced maker fee, a business of patience rather than prediction.
The arithmetic that eats it
Every taker trade pays 2 tolls before the view earns anything: the crossed spread and the taker fee. Take a market quoted 52 bid, 54 ask: buying YES at 54 pays about 1.74 cents of fee, so the all-in cost is 55.74 cents and the position breaks even only above a 55.7 percent true probability. A trader whose genuine edge is 2 points over the 53 cent midpoint keeps almost none of it. The arithmetic does not say edge is impossible; it says a small edge does not survive the tolls.
Longshot bias: what cheap contracts actually do
Karl Whelan's paper "Makers and Takers: The Economics of the Kalshi Prediction Market" studies Kalshi's own data and reports a consistent pattern: takers lose money on average and makers collect, with losses concentrated among buyers of cheap longshot contracts. Longshot bias means a 10 cent contract tends to win less often than 10 percent of the time. The fee schedule compounds the effect: 0.63 cents on a 10 cent contract is 6.3 percent of the stake, among the highest fee rates per dollar staked on the curve. Both facts are measurable; neither is advice.
Why most published strategy content proves nothing
The typical Kalshi strategy post offers illustrative prices, hypothetical trades, and no record. Missing every time are the 3 things that would make a claim checkable: fills with dates, sizes with fees, and a complete period with the losers left in. A screenshot of one winning position is survivorship, not evidence. The public tape is the standard here: every real fill printed on it, anonymously, and a strategy claim that cannot point at prints has chosen not to be tested.
Described, never advised
WhaleScanr publishes what the money did: the prints, the sweeps, the whales, each measured against the market it landed in. What that flow means is the reader's judgment to make. Nothing on this site is a recommendation. Described, never advised is the house line, and this guide is what it looks like in practice.
QUESTIONS
Can you make money on Kalshi?
Some traders do. Published research on Kalshi's own data finds takers lose on average after fees while makers collect, which is a description of the aggregate, not a forecast for any trader.
What is the house edge on Kalshi?
There is no house side; every contract is trader against trader. The exchange charges a taker fee peaking at 1.75 cents per contract, and makers pay a quarter of that.
What is longshot bias?
The tendency of cheap contracts to win less often than their price implies. It is one of the most consistently documented patterns in prediction markets, including in published work on Kalshi.
What would credible strategy evidence look like?
Dated fills, position sizes, fees paid, and the full period including losses. Claims in that form can be checked against the public tape; claims without it cannot be checked at all.