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Blockchain data infrastructure, explained
Guides to blockchain indexers, onchain data APIs, and the infrastructure underneath them. Written by the SQD team.
What is a blockchain indexer?
How indexers work, the types of indexer that exist today, and how teams choose one.
Multi-chain indexing explained
How to index data from many blockchains into one schema, the validation problem, and common architectural patterns.
What is a Solana indexer?
The Solana data model, the discriminator system, fork handling, and the SVM family. Concrete details from SQD's production Solana data lake.
What is a subgraph?
Subgraphs explained: the data model, mappings, schema.graphql, and what migrating one to another stack involves.
RPC vs indexed data: which do you actually need?
When an RPC endpoint is enough, when you need an indexer, and the costs of each.
More guides land every few weeks. For step-by-step tutorials, browse the documentation. For news and case studies, see the blog.