A demand index with visible limits
Skill Market Cap is a public skill-demand ranking built and operated by Adam Pang. Its job is narrow: show what a verified sample of live job boards is asking for, then make the method and its limits easy to inspect.
What Skill Market Cap measures
Skill Market Cap reads live postings from verified Greenhouse and Ashby job-board APIs. It classifies functional demand from titles and teams, checks requirements for named technical stacks, and refreshes the computed snapshot hourly. The highest matching role count becomes a demand score of 100, and every other skill is indexed against it.
Where the pay figures come from
Compensation figures use only employer-disclosed annual USD salary bands in the public posting data. The site shows the median band midpoint and the disclosure count beside each skill. Postings with no usable disclosure produce no pay figure, and hourly, non-USD, or ambiguous ranges are left out rather than estimated.
What the ranking cannot tell you
The ranking is a directional sample, not the whole labor market and not a historical trend. One role can match more than one skill. Compensation coverage is uneven because disclosure depends on the employer and posting. The project has no database of daily snapshots, no public API, and no claim that demand alone determines a person's fit.
Operator and source
Adam Pang operates Skill Market Cap and also operates its sibling project, skill.supply. The code, board configuration, classifier, compensation rules, and change history are publicly viewable in the project's GitHub repository.