Casper API is an infrastructure project designed for decentralized data storage compatible with any blockchain platform with smart contract capabilities. Users can store documents, photo, video, 3D model and audio files. Through the Casper API system, users pay for data storage and providers are rewarded for supplying these services. When a CST token holder decides to become a provider they have to purchase a certain storage volume quota which they must then register in the smart contract. The quota is attributed according to the rate of 25.6 GB for 1 CST. The smart contract regulates the storage network and supervises the work of providers.

CST is an Ethereum-based token that is used in every transaction within Casper API project on any blockchain platform as well as by providers when they acquire a franchise.