I think Google is the original inventor of link previews. It used to have them in the SERP pages if you clicked the magnifying glass. I think it was called "instant previews".
I actually created and launched an API on hacker news about 9 years ago which does this, you can check it out here: https://linkpeek.com
My service makes one request and caches the result. Using Pyramid (Python) and Nginx. Lots of the code is open sourced in various libraries.
The problem with trying to sell this tech is that all the biggest players build their own in-house solution, so the target market is really smaller sites, but they have a hard time paying, and also there is a lot of competition in this space now.
I actually created and launched an API on hacker news about 9 years ago which does this, you can check it out here: https://linkpeek.com
My service makes one request and caches the result. Using Pyramid (Python) and Nginx. Lots of the code is open sourced in various libraries.
The problem with trying to sell this tech is that all the biggest players build their own in-house solution, so the target market is really smaller sites, but they have a hard time paying, and also there is a lot of competition in this space now.