Go Pro! Pro is now free and gives you unlimited Bot Trading, access to Good Deals and more.

Steam Trade Volume

This chart represents live trade volume data from across the Steam network and annotates it with major events. (Note that most of the spikes are summer/winter Steam sales during which a lot of card trading happens):

Feel free to grab the raw data. Updates daily.

TradeTF has been collecting this data since April of 2019. Data from 2013-2018 was provided by BazaarTF. Special thanks to Spyfly from STN.tf for providing 5 months worth of data that I was missing.