> For the complete documentation index, see [llms.txt](https://docs.gravity.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gravity.xyz/legacy-alpha-mainnet-l2/the-graph.md).

# Indexers (legacy L2)

> **Legacy.** This page documents The Graph on the legacy **Gravity Alpha Mainnet (L2)** — the `gravity-mainnet` subgraph listed below. It does not apply to Gravity Mainnet (L1).

## Overview

Blockchain indexers are specialized tools or services that extract, process, and organize data from blockchain networks, transforming it into formats that are easily queryable and accessible for developers and applications. Given that blockchain data is inherently decentralized and stored in a sequential manner, retrieving specific information can be challenging. Indexers address this by creating structured databases or APIs, enabling efficient data retrieval and analysis.

## Indexers

### The Graph

The Graph is a decentralized indexing protocol that allows developers to build and publish open APIs, known as subgraphs, which applications can query using GraphQL. Indexers in The Graph Network operate nodes that index these subgraphs and serve queries, earning rewards for their services.

#### Supported Networks

| Network                           | ID                | Documentation                                       |
| --------------------------------- | ----------------- | --------------------------------------------------- |
| Gravity Alpha Mainnet (legacy L2) | `gravity-mainnet` | [View Documentation](https://thegraph.com/docs/en/) |


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