If you're interested in swapping items with another Seller (you send them your item and they send theirs), then we'd suggest still making the purchases through Yaga to ensure transaction safety. You can both set the same price for the items you're swapping --> both ship the items to each other --> once received, then each can release the money.
PS! We highly recommend to set the actual value of the item as the price and not Ksh 0 to avoid possible fraud.
If you'd like to swap items as a Buyer - this can be done if a Seller agrees to a swap, however, bear in mind that this creates extra shipping costs (1x shipping fee to return the initial item + 1x shipping to send the swapped item).