this is a clever idea - i've had a similar idea many many years ago infact but never followed through because i strongly disagree with making it easy to e.g. abuse google or yahoo by spamming their search engine. as much as i disagree with keeping proprietary secrets i agree more that people should have freedom of choice to do that...

in that regard its nice to see the big warning at the top of the page about ease of misuse (and a refreshing slap in the face - i was thinking 'pfft some hipster forgot common sense again' and expecting not to see anything of the kind)

there is something off here and i can't quite put my finger on it though... as a low level programmer I cringe when I hear web people using API to describe some weird little subset of APIs anyway. Here I feel almost like what this does is takes an existing 'API' (http - the internet) and refactors the interface in highly specific ways to make it easier to use...

At any rate. Its a clever idea and nice to see such a well thought through implementation - but its also far too open to misuse imo. I wish the creator the best of luck... hopefully no takedown requests too soon.