Lyris HQ is a hosted email marketing service for managing campaigns. The service lets users write email messages, create segments, edit lists, manage landing pages, track Web analytics and view reports. The API lets users access the service programmatically. Common uses of the API include synchronizing and centralizing data from in house CRMs and databases, automating the creation and delivery of newsletters and other messaging, and private label branding. The API uses HTTP calls and responses are formatted in XML. Full documentation is not publicly available.