This is a joke. The keys are generated not stored. And searching your own private key would be very stupid, since the service can log all searches and then steal your bitcoin (if they wanted to).
Flagged the story for this reason.
so this is a bitcoin pkey space test. where the endpoint theoretically contains all pkeys in so far as it is a generator function.
What's going on here? I just sent put .01 bitcoin to one of those addresses, lets see if I can sweep it now....