Use the coinmarketcap site for such details and use the exchanges for trading purpose, there are exchanges which is giving the details you are looking for but how do you end up getting those altcoin in first before even doing basic information about them?
I'm mining, not investing, thus I want to find some new (preferably obscure) coins to play with. That's why I specified that I didn't want any ERC20 tokens. I currently have 166 coin clients installed, but most of their blockchains are dead, and very few are still listed on an exchange.
I'd prefer to find an exchange I like and work backwards to see what coins they have available, rather than find a coin via a third party then figure out the exchange(s) to use for it.
I know it seems like a weird approach, but remember my perspective is like that of a multipool operator, rather than a retail investor.
Okay let's assume the coin you want to mine has been listed on an exchange so you will start to mine those coins more? What if the exchange volume is fake because there are many incidents proved that most exchanges fake the trading volume and also report fake prices just to boost the coin sales for a while.