DIA is a cross-chain, end-to-end, open-source data and oracle platform for Web3. DIA is an ecosystem for open financial data in a financial smart contract ecosystem. The target of DIA is to bring together data analysts, data providers, and data users. In general, DIA provides a reliable and verifiable bridge between off-chain data from various sources and on-chain smart contracts that can be used to build a variety of financial dApps. DIA is setup as a hybrid system with off-chain components for storing and processing large amounts of data and on-chain components providing data sources for financial smart contracts.