Wikidata
HTTPS CORS ? OAuth
Collaboratively edited knowledge base operated by the Wikimedia Foundation
API Endpoint
https://www.wikidata.org/w/api.php?action=helpMore Open Data APIs
Unofficial US Federal Government API Development
HTTP CORS ? Free
Normalized historical records and 25 daily-updated reference series
HTTPS CORS Free
Land suitability scoring API for any US property: off-grid, rural, recreational, investment
HTTPS CORS ? apiKey