Nice! Although longer name than preev, it makes more sense.
I'll throw in also a suggestion: please consider digit grouping for bigger numbers.

Also, right now it's just a competitor for preev with the (undeniably) nice touch of historical data. Not bad, but you have the tools for more.
Maybe for medium-long term you'd also add more fiat currencies (maybe from xe or similar) and more (all?) crypto coins that can be traded, at least for spot price. Then the website will become important.