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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.
Blockchain data API: a complete guide
RPC, indexed data, decentralized networks, and market data APIs. What each does and when to use them.
What is an EVM indexer?
The data model EVM chains share, what an EVM indexer must handle, and how indexing patterns translate across Ethereum, Base, Arbitrum, Polygon, and BNB.
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.