The Den Transaction is an experiment in which overnight stays in this space are bartered for services or goods. Services such as gardening, composting, painting, repairing, chicken coop construction, construction of other items such as furniture, organizing, cleaning and cooking are all acceptable for trades. Products such as art, food, plant material, jewelry, livestock and other goods may also be traded. One service or item can be bartered for one night at The Den. Services are to be preformed either the afternoon before or the morning after the stay.
(Text from Den Transaction webpage)