Each application - their website included - uses its own set of API credentials to make calls, thus identifying a client is trivial. Pedantic edit: version 1 o

Each application - their website included - uses its own set of API credentials to make calls, thus identifying a client is trivial. Pedantic edit: version 1 of the API supported some anonymous calls, but that version is very close to being dropped. All API calls to version 1.1, though, must be authenticated.