"volumeto" means the volume in the currency that is being traded
"volumefrom" means the volume in the base currency that things are traded into.
lets say you are looking at the Doge/BTC market.
the volumeto is the Doge volume for example 1,000,000
the volumefrom is the BTC volume which if we assume Doge price was 100 fixed it will be 10,000
thanks, I was searching for the meaning and isn't mentioned in the description