
Official social media handles and identifiers of 155,000+ notable people and organisations.
Verified Handles API is a free Open Data API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
The Verified Handles API: read any public entry, its handles and its history, or search them all, as JSON. No account needed.
Details from verifiedhandles.org.

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Courses, lecture videos, detailed information for courses etc. for the University of Oslo (Norway)
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The Verified Handles API is provided by Verified Handles (verifiedhandles.org). The Verified Handles API: read any public entry, its handles and its history, or search them all, as JSON. No account needed.
Yes. The Verified Handles API is listed in the Open Data 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 Verified Handles API requires no authentication, so you can start making requests without signing up.
Yes. The Verified Handles API supports CORS, so front-end JavaScript can call it directly.
Yes. The Verified Handles API is served over HTTPS, so it's safe to use in production.