Upstar MLS (UMLS) – MLS/IDX Search for Real Estate Websites. Add the Upstar MLS (UMLS) IDX feed to your real estate website today. As a member of Upstar MLS (UMLS) , you have access to home search tools that will help you close on more listings. IDX Broker does this by integrating your design with … Continue reading Upstar MLS (UMLS)