Overview

Acuity Index is a configurable event indexer for Substrate-based blockchains. It is primarily intended for dapps to query directly as an event indexer, although other consumers can use it too. It connects to a node over WebSocket RPC, decodes runtime events, stores queryable index entries in a local sled database, and exposes the indexed data through its own WebSockets API.

The project is intentionally config-driven:

• chain-specific indexing rules live in TOML instead of generated Rust types
• event payloads are decoded generically
• the on-disk index is built around explicit query keys
• returned events can include GRANDPA proofs so light clients can verify correctness
• operators can update accepted index specs without restarting the public service

Funding

Acuity Index was originally called Hybrid and was funded by two (1, 2) Web3 Foundation grants and a Kusama Treasury referendum. A second funding referendum failed. Treasury funding for a Kusama Forum based on Acuity Index has been secured.

Who This Book Is For

This book serves three overlapping audiences:

• operators running acuity-index against a live chain
• application developers integrating with the WebSockets API
• contributors working on the Rust codebase and benchmarks