What service can provide a "mock" (pseudo) portfolio for cryptocurrency?

Question

Cryptocurrency

Unfortunately, I do not know what term is used for such functionality.
I will try to describe in words:
This is a kind of functionality where we create a "pseudo-portfolio" - we select the necessary cryptocurrencies, enter their number and look at the current value now / retrospectively.

That is, the same Coinbase, but where we enter our data.