For a second I thought this actually gave access to the graph, so you could actually traverse it a la 'see the edges, visit the nodes', which surely would have piqued my curiosity. This doesn't seem to offer much more over HN user/DuckDuckGo operator Gabriel's API[1]. I have a console app I've written that queries WolframAlpha and DDG. Between the two, > 90% of my 'fast questions' get answered (with the added bonus of a decent privacy policy).
https://duckduckgo.com/api