Casper API is a decentralized data storage system for DApps (decentralized applications) on any blockchain with smart-contracts. Casper API is a cross-chain solution allows creating new DApps never before possible. For example: decentralized blogging platforms (like Medium), marketplace or social media. Casper API raises the level of the blockchain ecosystem, thereby developing the blockchain market. The technologies by which the Casper API complements any blockchain with smart-contracts are decentralized p2p storage and CDN. Imagine our nearest future, when information will not only be generated by you, but billions of IT devices: drones, self-driving cars, robots, AR/VR. All of them require an immense storage volume for information, which will cause significant demand for the service in question from both classic-style applications and DApp. Casper API can help solve the issue of high data storage prices. After switching to a decentralized storage you can save up to 66% compared to the cloud storage giants of today. This is made possible with the help of providers putting up their hard drive capacity, both private persons and data centers can put up as little as 25.6 GB for rent and enjoy monthly rewards in CST – the system's tokens. It will help increase the reliability and security of the data stored due to decentralization. You will never lose your data and will always have access to it. By uploading your data you can be sure that you alone is the only person with the access. Located all around the world, providers ensure the operation and security of the entire network, and the smart-contract automatically runs hourly check-ups when copies are created. Thus upon finding a disconnected provider, the system immediately copies all the data stored on his HDD, keeping the number of proper copies. Cloud storage market looks like the most perspective out there at the moment, projected to reach $72 billion by 2020. This makes the solution put forth by Casper API all the more attractive.