You can see the first (public) version of One Marketplace at inc.one/marketplace. To submit your offers, login to inc.one/login and click the yellow button that says 'Submit an Offer to Marketplace'. Once submitted, you can manage your offers (change/add details, etc.) at inc.one/marketplace-manager.
Soon, there will be a button for each offer that enables anyone to purchase the offer through One Economy—using R$ that represent all different types of capital.
Would love reflections, feedback, bug reports, etc. on this!