There is no way to know if a coin is overvalue or undervalue before it hits the exchanges. All these data means nothing because in 2013, coins can go as low as 0.001 usd per coin during pre-ICO. Now, everyone is hyped up and value their coin at 0.01 to 1 usd at pre-ICO. Both are over valued in my opinion, because value is derived from its popularity, not from its usefulness. If I say a pebble on the beach is worth 10 usd, and this is popularly accepted, this is its value, but it is still a plain useless pebble found freely on a beach.