Indexers The Graph Learn how to build APIs, called subgraphs, to store and fetch on-chain data for a given smart contract using The Graph indexing protocol on Moonbeam. Covalent API Querying blockchain data such as balances, transactions, transfers, token holders, and event logs on Moonbeam with the Covalent API. SubQuery Learn how to use SubQuery to index Substrate and EVM chain data for Moonbeam and Moonriver, and query the data using GraphQL. Subsquid Learn how to use Subsquid, a query node framework for Substrate-based chains, to index and process Substrate and EVM data for Moonbeam and Moonriver.