Well lol, sweat DOES have a TT price, i.e. you can sell it at the Terminal, but it's only 0.01 PEC per 1000... so it's not advisable at all tbh. ;)
Like Humbll said, you sell it to other players. The price per 100 sweat at the moment is about 0.45-0.50 PEC - i wouldn't sell it any lower than...