On Swappable there are no additional transaction fees next to the Ethereum gas fees charged to the buyer.

There is no fee to list your item for sale on Swappable.

When you sell your item, there is a small marketing fee charged at the time of the sale. This marketing fee is 2% when paid in ETH, or 1% when paid in SWAP. 80% of the fees are returned to the community staking pool, 20% are burnt.