Indexer
Also known as: Blockchain Data Node, Web3 Data Aggregator, Subgraph Operator
A node or service that processes and organizes blockchain data for fast and efficient querying, often used in Web3 infrastructure.
An indexer is a specialized node or backend service that collects, processes, and structures blockchain data to make it easily accessible. Indexers are essential for enabling real-time querying in dApps, wallets, and analytics platforms. They listen to blockchain events and store relevant information in databases optimized for search. Protocols like The Graph use decentralized indexers to maintain subgraphs, while other platforms offer centralized indexing APIs. Indexers support scalability and user experience by eliminating the need to scan raw blockchain data directly.