You can now sign in to Coinranking with your Apple ID. If you are an Apple user this can be the most convenient way to access your account at Coinranking API.
We are making your developer experience better every day 
apple looks is no more available for signing in. there is an extra work on their website.
Thank you,
Jean
Are you sure? I just tested it and it works on my end. Do you get an error or anything, could you share a screenshot and provide some context?
Thanks a lot.