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XRay is an open source API that returns structured data for a URL by parsing microformats and following other indieweb algorithms, and is part of the p3k suite of applications.
The instance of XRay run by Aaron Parecki at https://xray.p3k.io is used by webmention.io to parse comment text, and used by Loqi to display a text summary of URLs in the IRC channel.
You can try the API with your own URL or by pasting in HTML here: