The Quick Answer
More than a third of the time, the best price on Kalshi is good for four contracts or fewer. Across 584,129 order books we captured on 46 Kalshi series, 36.0% of best offers were four lots or less.
A price is not an amount. The number on the screen tells you what one contract costs; it says nothing about how many you can have at that price, and on a prediction market the honest answer is frequently "almost none."
The Distribution Is The Story
Order book depth usually tapers — a lot of small orders, fewer large ones, a smooth curve. Kalshi's does not. On the Dow series, where we have 393,772 books, the size sitting at the best offer looks like this:
| Size At Best Offer | share of books |
|---|---|
| 1 Contract | 28.5% |
| 2 | 11.4% |
| 3 | 6.0% |
| 4 | 3.5% |
| 50 | 22.6% |
| 100 | 21.9% |
That is not a curve. It is two separate populations: a cluster at one to four contracts, and a cluster at exactly fifty or exactly one hundred.
Round lots of fifty and a hundred are what a market maker posts — a standing quote, sized deliberately, repeated. Ones and twos are what everybody else posts. So roughly half the time you look at the Dow book, the best price you can see is a retail order sitting in front of the professional quote, and it is good for a couple of contracts.
It Varies Enormously By Market
| Series | books | 1–4 lots | 50+ lots | median size |
|---|---|---|---|---|
| KXTSAW (TSA Throughput) | 663 | 63.5% | 25.6% | 2 |
| KXDJI (Dow) | 393,772 | 51.2% | 47.0% | 4 |
| KXJOBLESSCLAIMS | 481 | 33.9% | 37.8% | 15 |
| Weather (Daily High) | 7,619 | 18.2% | 43.3% | 25 |
| KXNASDAQ100 | 2,488 | 22.7% | 74.8% | 1,000 |
⭐ KXNASDAQ100 is the one to look at twice. Its median size at the best offer is a thousand contracts — by far the deepest book we measured. It is also quoted on both sides only a third of the time. When somebody is there, they are there in size. Most of the time nobody is.
That combination — enormous depth, rarely available — is invisible in any statistic that averages the two together, which is most of them.
Why This Matters More Than The Spread
The spread tells you what one round trip costs. Depth tells you whether the trade exists at all.
If the best offer is good for two contracts and you want fifty, you do not pay the price you saw. You pay that price for two, then walk up the book for the rest — and the further you walk, the worse it gets. A quoted one-cent spread on a book two contracts deep is not a one-cent spread for anyone trading real money. It is a headline.
Three practical consequences:
- Size your order to the book, not to your conviction. Check what is actually resting before you decide how much you want.
- A tight spread on a thin book is a trap. The two numbers are set by different people and they do not move together.
- Use limit orders. If you take a market order into a two-lot best offer, you are agreeing in advance to whatever the next price up happens to be.
What This Does Not Tell You
- Top Of Book Only. We measured the size at the best bid and offer, not the full ladder underneath. The depth two or three cents away could be far larger — that is exactly the number we cannot see, and it matters.
- Ten Days. 2026-08-03 to 2026-08-12. Every series is measured on the same dates so no market is advantaged by being sampled in a different week.
- No Sports. Our capture did not cover sports series in this window. That is the largest category on Kalshi by volume and it is missing here; collection has started and it will be measured separately rather than guessed at.
- Wildly Uneven Samples. The Dow contributes 393,772 books; several series
contribute a few hundred. The
bookscolumn is there so you can weigh each row accordingly. - A Size Is Not A Promise. A resting order can be pulled before you reach it. This measures what was displayed, not what would have filled.
FAQ
How deep is a Kalshi order book? It depends enormously on the market, and the average is misleading because the distribution is bimodal. Across 46 series, 36.0% of best offers were four contracts or fewer, while a large minority were round lots of fifty or a hundred.
Why are so many best offers just one contract? Because a retail order for one contract at a better price sits in front of a market maker's larger quote. You are seeing the front of the queue, not the size of the market.
Can I buy a thousand contracts on Kalshi? On some markets, at some moments, yes — KXNASDAQ100 showed a median of a thousand at the best offer. But that same market had no two-sided quote at all two thirds of the time. Depth and availability are different questions.
Where did this data come from? Our own capture of Kalshi's public order book: 584,129 books across 46 series between 2026-08-03 and 2026-08-12. No account data, no private feed.
OddsShopper covers prediction markets as an independent analyst. Kalshi contracts are CFTC-regulated event derivatives traded on a designated contract market, not sportsbook wagers, and they can lose their full value. 18+, available where Kalshi operates, with broad, state-specific availability under federal oversight. The risk of loss is real. Stokastic trades prediction markets and holds positions in them. We have no affiliate or commercial relationship with Kalshi. Nothing here is a pick, a play, or trading advice.
