Substrate indexing squids

This repo contains sample squid ETLs for indexing, transforming and presenting on-chain data of Substrate networks as GraphQL APIs. Each squid highlights a specific feature of the Subquid SDK.

Overview

• 1-events: Indexes Balance.Transfer events on Kusama.
• 2-calls: Indexes calls to Identity.set_identity and Identity.clear_indentity.
• 3-storage: Queries the historical network storage state to enrich event data.
• 4-constants: TBA
• 5-frontier: Indexes EVM logs emitted by a contract on Moonriver. The approach shown in this example is suitable for use cases requiring a mixture of Substrate and EVM data; consider using EVM processor instead if you only need EVM data.
• 6-remark: Indexes on-chain footnotes made by the System.remark extrinsic.
• 8-custom-resolver: Indexes Balance.Transfer events and outputs total daily volumes via a custom GraphQL resolver.

Prerequisites

• Node v16.x
• Docker
• Squid CLI

To install the Squid CLI, run

npm i -g @subsquid/cli

Running

Navigate to the example folder.

npm ci
sqd build
# start the database
sqd up
# starts a long-running ETL and blocks the terminal
sqd process

# starts the GraphQL API server at localhost:4350/graphql
sqd serve