---
name: Indexing
description: "How to read and query onchain data — events, The Graph, Dune, Ponder, Multicall3, and WebSocket subscriptions. Why you cannot loop through blocks and what to use instead."
metadata:
  homepage: https://ethskills.com
  install: external
---

# Indexing

Provided by EthSkills. Installs outside this repo — see `catalog.json` `install.command`.