I'm trading on Bittrex. I input the values for each trade into Cryptocompare so I can get an idea of how well I'm doing. However, since most of these coins are only traded with bitcoin, when bitcoin goes up, the theoretical value of the coin goes up. I can't get my head around this. The best way I've found so far is when I let Gunbot run (the automated buying/selling app) in Bittrex it constantly buys and sells (in btc) so I can look at my total btc to give me an idea of how well I'm doing.
How are you keeping track?
You sound like you bother about USD value but you are trading against BTC, am I right? If you trade against bitcoins then do not bother dollar values. Commonly, I do see people are comparing values of altcoins in dollars but they do trade in BTC pairs. These traders must choose USDT pair as now a days most crypto exchanges are having this option. In 2014/2015, we started to have trading pairs with LTC/Doge but now a days ETH/USDT pairs are famous. I guess a stablecoin pair will be good for the people who concern fiat value.
I bother only BTC value. So, I trade with BTC paired instruments and I do calculate my profit/loss things in terms of BTC/satoshi regardless of where BTC prices are doing. It became possible for me because I value bitcoins and I save them for longer holding regardless of where bitcoin market is heading.