To know the market price you most subscribe to some populars trading site and
https://coinmarketcap.com. I believe most of the first hand information are provide there and you can used the site to analyze trend and invest along the lines.
Coinmarketcap is just providing the status of Cryptocurrency. But it is no t enough to identify the price of market. Lot of investors are having many technical analysis but few peoples only follow these sites so we should develop our skills in price prediction of future market.