Ceres is the infrastructure of Web 3.0 decentralized credit system, providing readable user identities for native DApps and a more human-acceptable user system. It also offers an Oracle Protocol and a Reputation Evaluation Model. The Oracle Protocol is used to efficiently and accurately analyze and estimate users' on-chain transaction data. Additionally, users/project parties can use the Evaluation Model to analyze the quality of the on-chain social graph and influence index.