STATISTICS
Every figure with its source and date.
Polymarket US, from its published schedule, effective September 17, 2026, captured 2026-09-17:
taker: 0.0695 x C x P x (1-P) 1.74¢ per contract at 50¢ maker: rebate of 0.0125 x C x P x (1-P)
The terms above, their two clocks and the daily check on them are on the venue schedule panel, and the edge a trade needs at each price is the panel below it.
Taker on Polymarket US costs 0.0695 × P × (1−P) per contract, so the edge one leg has to clear is that number and the price decides it. Formula and grid, in cents per contract:
price taker, one leg taker, round trip 10¢ 0.63¢ 1.25¢ 30¢ 1.46¢ 2.92¢ 50¢ 1.74¢ 3.48¢ 70¢ 1.46¢ 2.92¢ 90¢ 0.63¢ 1.25¢
The takeaway. A taker round trip at 50¢ costs 3.48 points of edge on this venue, and the fee is largest at 50¢ and smallest at the edges. The per-price arithmetic and its receipts are on the venue fee panel.
One complete walk of the open catalogue: 15,508 open markets, captured 2026-07-25 (capture G1, population digest a7ef2cee…). The catalogue moves. These figures describe that capture, not today, and no two figures from different captures are differenced on this page.
tick size markets share of open catalogue $0.01 14,372 92.67% $0.001 769 4.96% $0.005 367 2.37% total 15,508 100.00%
The takeaway. 1,136 of 15,508 open markets (7.33%) tick finer than a cent. Code that assumes a penny grid mis-prices them. The fee coefficient was a single value, 0.06, across every open row of the capture, which corroborates the published schedule rather than replacing it.
Fee quotes are extracted from saved copies of the venues' own pages, hashed at capture time, and a standing test asserts that every quote on this site appears byte-for-byte in its named capture. Before a schedule ships, a human compares the quoted constants against the live page once and logs the dated confirmation. Numbers from trade press or search summaries never ship, and two figures from different captures are never quoted together.
The takeaway. If a figure has no receipt, it does not ship.
This table moved to Market dates, beside the expiry counts, and it shows the same rows from the same capture: open interest by category. This heading keeps its address, so a saved link still reaches the figure.
41 intervals of Polymarket US rules text, 2026-07-31 to 2026-09-13, joined from 42 usable captures. The rate below counts only the 33 intervals at least 20 hours wide and measured end to end by one instrument, because an all-interval rate would mix 0.01-hour and 120-hour intervals under one denominator.
carried market-intervals 775,542 changed 16,152 day-scale change rate 2.0827%
The takeaway. Wording changed, void language changed, deadlines moved and rules text changed length bracket. Not one market changed the source its outcome is read from. A market counts here only when it is carried through both captures of an interval, so this is a lower bound on what changed and never an estimate of it. The axis, the class mix and every receipt are on the rules census on the venue screen.
This desk publishes its own measurements of its own instruments as a versioned file: how many capture runs it made, how many its completeness guard refused, over what span and at what cadence, how many watches it declares, and the digest of the artifact each figure is read from. Every figure names its instrument and the path it is read from, so a reader can re-derive it rather than trust it.
Cite this series by its DOI: https://doi.org/10.5281/zenodo.22240062
Licence: CC BY 4.0 (CC-BY-4.0) — https://creativecommons.org/licenses/by/4.0/
This release is Splitrule's own measurements of its own instruments: counts of its runs, refusals and watches, the cadence at which they fired, and digests of the artifacts it produced. It contains no venue market data and no material derived from any venue's market data.
The licence is offered over whatever rights Splitrule holds in this compilation — its selection, arrangement, structure and accompanying text. It is not a claim of ownership over the underlying facts. Individual facts are not ours to license, and where a use needs no permission, none is required here.
What we ask, and what we require, are different things. We ask that you cite this release by its DOI, because that is how a measurement series stays traceable to the method that produced it. Where CC BY applies, that attribution is a condition of the licence. Where it does not, the request stands on its own and nothing in this notice makes it more than a request.