In addition to the loc.gov API, there are other APIs and machine-readable data services maintained by the Library separately from the loc.gov API, including APIs for Chronicling America and the Prints and Photographs Online Catalog, as well as data services for authority, bibliographic, and catalog data.
Additional APIs and Data Services
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Congress.gov API Beta The beta Congress.gov Application Programming Interface (API) provides a method for Congress and the public to view, retrieve, and re-use machine-readable data from collections available on Congress.gov.
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Search/Retrieval via URL Search/Retrieval via URL (SRU) servers, including the Z39.50 gateway to the Library catalog.