Things That Surprise People on Kalshi
The settlement quirks, fee shapes and structural details that catch new users out, collected in one place so they catch you somewhere cheaper.
Every one of these is documented somewhere in the contract terms. They still catch people, because the terms are long and the market title is short. Collected here so the first time you meet them is cheaper.
The first print settles it, not the revision
Economic figures get revised, sometimes substantially. Contracts settle on the value published at the named moment. A revision three weeks later does not reopen anything. You are trading a specific agency's specific first estimate, not the eventual truth. Where settlement numbers come from has the detail.
The fee is largest at fifty cents
It is not a flat percentage. It scales with price times one minus price, which peaks in the middle. The most ordinary-looking trade is the most expensive one. How the fee works.
A tie at the strike is not a coin flip
"Above 3.0" with a print of exactly 3.0 resolves according to a rule written in the terms, and that rule is not always the one you would guess. Read the comparison operator, not the market title.
Official results can lag the obvious answer
A contract that requires an official certification will not settle when the result becomes clear to everyone. It settles when the certifying body acts. Between those two moments the price sits near the extreme and your capital stays locked.
Markets in the same event are not independent
A strike ladder is one distribution, not several bets. Holding "above 2.0" and "above 2.5" is a position on the interval between them whether you think of it that way or not. Correlated positions is about noticing this in a portfolio.
Selling is not the cheap side
Selling a contract at 5 cents means putting up 95 cents to collect 5. The position looks like a small trade and consumes almost a full dollar of capital per contract. The return on capital is not what the price suggests. Capital lockup.
The quote can be live while the last trade is ancient
A market with no trades in two days shows a two-day-old last trade beside a perfectly current bid and offer. Charts built on last trades will contain these. Mid price versus last trade.
Wide spreads persist at the extremes
A one-cent tick is one per cent of a hundred-cent contract and thirty-three per cent of a three-cent one. The tail is structurally coarse, and no amount of liquidity fixes it. Prices near 1c and 99c.
Yes plus No does not always look like a dollar
Across the two best quotes it will not, because the spread sits between them. If the bids on both sides add to more than a dollar, or the offers to less, look again — it is usually one stale side rather than an opportunity.
Cross-venue gaps are mostly not opportunities
The same-sounding market elsewhere may use a different source, a different threshold or a different deadline. A price difference that reflects a real difference in the question is not an error. This site reports a theoretical cross-market edge with an equivalence grade attached precisely because the grade is the part that decides whether the number means anything. What a gap is worth and equivalence grades.
Next
The other side of the comparison: what Polymarket is and how an on-chain venue differs.
Educational content only. Nothing here is financial advice, a solicitation, or an offer to trade. Prediction markets can move against you and a position can lose its entire value. Where this guide describes a difference between venues it describes a theoretical cross-market edge in observed prices, which is not a profit: fees, spreads, capital lockup, transfer time and differing settlement rules all come out of it first.
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