Introducing Hydra, a GraphQL query node for substrate chains

Bird-eye overview

Hydra has two principal components: Hydra Indexer and Hydra Processor. Hydra Indexer ingests raw data from a substrate chain. Hydra Processor is responsible for transforming the raw data into domain-level entities as defined in schema.graphl and the event handlers, both provided by the user. hydra-cli provides additional scaffolding and codegen tooling for running and developing a Hydra Processor tailored for the provided schema file.

Hydra Indexer (top) and Hydra Processor (bottom) data flows

What's next?

  • Explore live Hydra Indexer playground and query Kusama events and extrinsics

  • Install Hydra toolkit

  • Hydra tutorial: spin a query node in under five minutes

  • Look at the examples

  • Learn how to define your own data schema and mappings to run a Hydra Indexer