The Sonde Health Check API measures the level of wellness/health in a given voice sample. A Respiratory Symptoms Risk score is returned from a voice input. This service could be useful to catch early symptoms of COVID-19 and distinguish between that and flu. The API can also be used to determine an Emotional Fitness score from voice input. Methods are available to manage users, authentication, storage, measures and inference. The API is available to partners of Sonde Health. Sonde's platform is HIPAA compliant and has banked over 200,000 voice samples from over 50,000 subjects to develop its Health Check models.