Hi all,
you could indeed connect Excel via VBA to any of the online available APIs. It's work-in-process for me:
I am working on an Excel/VBA tool for e.g. Kraken, BTC-e and Poloniex in this project: https://github.com/krijnsent/crypto_vba
Getting data from e.g. min-api.cryptocompare.com is on my ToDo list. What data are you looking for? Historical rates? Daily/hourly/monthly? High-Low-Open-Close-Volume? Per exchange or just one exchange?
Cheers,
Koen