Is there any way to trade weapons, warframes, blueprints, or materials in warframe? There isn't a page for it in my steam inventory, but I figured that that might just be because it can also be played without downloading it through steam (by downloading through the original developer's site instead). Is there in fact a way to do it in-game, or am I forced to sell my gear that I don't want, even if a friend needs it?
You can trade mods, keys and platinum with other players in the clan dojos, if both of you are over mastery rank 2. You have a limit on how many trades you can do each day and each trade costs credits as a trading tax.