I think the OP means the Bid/Ask spreads. @maxoptions Just list the Futures you are considering. You can't trade all the futures...practically speaking.
You mean I have to click the future and look the current spread? No average spread list of sorts? I clicked this and was able to see the spread https://www.barchart.com/futures/quotes/GCG20/overview
maxoptions, pay for any good futures software, create a watch list, include the symbols you want to watch, add columns for BID and ASK, then export to a spreadsheet to do your math. What value does this have?