Open Page Rank
API for calculating and comparing metrics of different websites using Page Rank algorithm
Search and access VS Code extensions from the Open VSX registry.
Open VSX API is a free Development API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Details from open-vsx.org.

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API for calculating and comparing metrics of different websites using Page Rank algorithm
The Open VSX API is provided by Open VSX Registry (open-vsx.org).
Yes. The Open VSX API is listed in the Development 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 Open VSX API requires no authentication, so you can start making requests without signing up.
Yes. The Open VSX API supports CORS, so front-end JavaScript can call it directly.
Yes. The Open VSX API is served over HTTPS, so it's safe to use in production.