SoundCloud announces rate limits for third party APIs (developers.soundcloud.com)

"Effective July 1, all requests that result in access to a playable stream are subject to a limit of 15,000 requests per any 24-hour time window. Currently, this is inclusive of all requests that are made to /tracks/:id/stream."

Pretty big blow for the third party ecosystem..a ton of music related services will see some issues now.