Harvard Art Museums API
REST/JSON API to the Harvard Art Museums' collections across 25 documented resources (object, person, exhibition, publication, gallery, classification, culture, medium, period, place, image, iiif, spectrum and more), with pagination, aggregations and IIIF image services. Free key, non-commercial use. Built and run by the museums themselves - the host is their own application on Heroku, not a collections-platform vendor, and the code and docs live in the harvardartmuseums GitHub org. Documentation is 25 markdown files; there is no machine-readable contract, and the API root 301-redirects to the docs repo.