Master haejin Not that my opinion matters much maybe $0.02. I think your original way of analyzing coins with just the USD pairing is best. When looking at your next analysis of the same coin a week or two from now (using USD) and the present one - comparing the two is like comparing apples and apples. With bitcoin (to me) it's like apples and oranges. Especially when planning a trade exit or another entry point now or in the near future. Of course calculating the present USD BTC prices on some exchanges are necessary anyone can use the https://coinmarketcap.com/calculator/ whereas trying to calculate the BTC price of last week for trading today is quite difficult.