I use Binance, Bittrex, Kraken (mainly for margin trading). I use dollar values whenever possible. As I use concentrated ladders or no laddering at all little differences in value doesn't matter. So I use the BTC/ETH price approximately. Maximum time I leave my ladders open is 12 hours (in practice it's mostly 2-8 hours). I actively watch charts for a bottom/reversal or top/reversal using fundamentals, MACD and Chart patterns. When I sense a good buy/sell opportunity I jump in.

You have to be a very assertive and emotionless person or you could end up getting burnt using this strategy. It's safer to use a set of entry/exit points (ladders) spread across like a shotgun and just leave things be.