Hmm I'll take a shot, give me some time to think and I'll post my ideas here soon

Hope for whatever you're doing we get to help you out
Thanks! Your help is much appreciated!!
something about send fee and mempool. maybe also ICOs too?
Mempool is kind of covered under the "Number Of Unconfirmed Transactions" statistic.
I suppose that I can add Mempool size as well though. The problem with those types of statistics is that they are only really applicable to Bitcoin at the moment. However, I am trying to be proactive and add them because they will probably be applicable to other cryptocurrencies in the future. I think only Bitcoin has APIs available for such statistics.
ICOs is a good suggestion. An ICO countdown/ICO lists subcategory could fit in under the "General Cryptocurrency Market Data" category.
I will add a mempool size statistic and ICO related subcategory. Please provide a Bitcoin address.