dro
Dunno if this is still relevant or not but you're given all of the information in the SC API responses to be able to generate the SC playlist url as...
For that example (if going for the m3u version), then you'd have "shoutcast.com/sbin/tunein-station.m3u?id=1057402" as the playlist which then the client / tooling parses to get to the actual stream url(s)...
It should work without the "http://yp." and just using "http://" so is a bit odd it's not working for the shorter url for you. I was issued a devid before...