Overview

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