Astra is a cloud platform for media applications, enabling the storing and transcoding of images and videos. Using the Astra API, developers can implement storing static files with key-values, perform type-specific transformations such as resizing or cutting video, and process content delivery methods such as a URL link or channelling through a content delivery network. The API uses HTTP and responds in JSON exclusively. Astra charges a flat rate for disk space and bandwidth, and does not charge for API usage. The infrastructure behind Astra has powered PhotoShelter, an portfolio and eCommerce site since 2005. Astra's storage system currently handles billions of objects, comprising several PBs of data.