...complete with easy API?
https://softwareengineeringdaily.com/2018/10/31/diffbot-knowledge-graph-api-with-mike-tung/
Transcript: https://softwareengineeringdaily.com/wp-content/uploads/2018/10/SED708-Diffbot.pdf
...
"Crawlbot creates a structured index of practically any site's data."
https://www.diffbot.com/products/crawlbot/
Sounds pretty ambitious. Maybe IBM Watson now has serious competition?
...looking at the pricing/plans this is Serious Enterprise-Level Business.