In all dictionaries I looked at, there are examples of the structure, "swap something for something" and "trade something for something," but there are no examples of "swap something" or "trade something". So I wonder if we can use the structures "trade something" and "swap something". What I mean is, I only see sentences like "I swapped/traded my guitar for another," "I swapped/traded my computer for a gaming console" etc. instead of "I swapped/traded my guitar," "I swapped/traded my computer" etc. So I wonder if it is wrong to not add "for..." to those sentences. For example let's say I am having a guest. He asks, "Where is your blue guitar? It doesn't seem to be around." If I swapped/traded that guitar for another thing, and if I don't want to tell him what I swapped/traded it for, can I answer this question by saying,
"I traded it."
"I swapped it."
Or would they be grammatically wrong? Do we always have to add what we swapped/traded it for in sentences like these?