From where can I find the accurate values of cryptocurrencies?

Accurate? That word is kind of contradictory for Crypto World. As, there are different market, so there will be some amount of variation in different market.

But, the best way for you to check for the price is using coinmarketcap.com

And check for each currency in “Market” section, to know the price in different market.

Source: https://www.quora.com/From-where-can-I-find-the-accurate-values-of-cryptocurrencies/answer/Shebin-John-4