
Contains D.C. government public datasets, including crime, GIS, financial data, and so on.
District of Columbia Open Data API is a free Government API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
On this site, the District of Columbia government shares hundreds of datasets. The District invites you to browse the data, download it as a file, analyze it with your tools, or build apps using our APIs.
Details from opendata.dc.gov.

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The District of Columbia Open Data API is provided by Open Data DC (opendata.dc.gov). On this site, the District of Columbia government shares hundreds of datasets. The District invites you to browse the data, download it as a file, analyze it with your tools, or build apps using our APIs.
Yes. The District of Columbia Open Data API is listed in the Government category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The District of Columbia Open Data API requires no authentication, so you can start making requests without signing up.
CORS support for the District of Columbia Open Data API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The District of Columbia Open Data API is served over HTTPS, so it's safe to use in production.