The auctions provided by Manifold below propose 6.9% of the sale to whom connects the winning collector to the piece: I will manually raise the "decentralised agent fee" to 10%

 - if the collector finds the piece through you and win for 5 eths, you get 0.5 eths.

The works can be found on SuperRare as well, although primary sales there would not grant agent fees. This page can take some time to load and is best experienced on desktop..