I use 3 tools to help me decide if its time to Buy or its a time to Sell. In Bittrex they have different tools there and my most used are RSI (Relative Strength Index), Parabolic SAR and Bollinger Bands. First one will tell you if its overbought or is oversold, if its oversold, most likely there will be a change of trend and it will go up, but its not a signal for you to start buying you still need to dyor. Now with Parabolic SAR, it will tell you if its time to Buy or Sold but it depends on your settings, still it needs further research.