The unique opportunity to obtain the most updated and historical snapshots of NDVI access is now available through PreAgri REST API. For just $0.2, you can get an NDVI snapshot with a biomass analysis of polygon, satellite, and date specified in the inquery. You can also download the result in Json and Png format using a unique identifier. To form the API requests, just register and top up your account with $5. You can perform requests on the Explorer API page, using an access key or simple authentication.