---
title: "Bonus Lesson 2: Indexing"
description:
  Add indexing so product surfaces can query and present onchain data reliably.
---

## Lesson goal

Design the read layer that turns raw onchain data into something products can
use quickly and reliably.

## Checkpoints

- Identify which views should be served from indexed data.
- Decide how freshness and consistency should be handled.
- List the failure modes that would make a product UI misleading.