APSARA (Apsara Cryptocurrency Benchmark Index, abbreviated as ACI, and translated as "Feitian" in Chinese) is a public chain ecosystem designed for the token index economy. Its goal is to establish a decentralized token index infrastructure using blockchain technology. By leveraging forward-thinking blockchain technology, it provides technical solutions for the token industry, building a fair, free, and convenient ecosystem for various participants in the token economy, including individuals, businesses, and developers. ACI refers to the basic unit of circulation within the APSARA ecosystem and serves as its sole medium for commercial and financial transactions. It functions both as a medium of exchange and a store of value.