# Indexers

Indexers play a crucial role in the Lumia L2 ecosystem by transforming on-chain data into easily queryable formats, enabling efficient access to historical blockchain data, and powering essential analytics for decentralized applications (dApps). While Lumia L2's RPC nodes provide real-time access to current blockchain state, indexers complement this by organizing historical data in optimized database structures for complex queries and analytics.

### Understanding Blockchain Indexing

At its core, blockchain indexing involves:

1. **Data Extraction**: Continuously monitoring and processing blockchain events, transactions, and state changes
2. **Data Transformation**: Converting raw blockchain data into structured formats optimized for querying
3. **Data Storage**: Maintaining organized databases that allow for efficient retrieval and complex queries
4. **Query Interface**: Providing APIs (typically GraphQL) for applications to access the processed data

For Lumia L2, indexing is particularly important for many things but some examples could be:

* Tracking liquidity positions and historical trading activity across Lumia Stream
* Monitoring Real World Asset (RWA) tokenization events and ownership changes
* Analyzing cross-chain bridge transactions and token movements
* Supporting complex DeFi analytics and portfolio tracking

### Available Indexing Solutions

Lumia L2 supports two primary indexing solutions:

#### The Graph Protocol

A decentralized indexing protocol that enables the creation of open APIs (subgraphs) for accessing blockchain data. The Graph uses a decentralized network of indexers who process blockchain data and serve queries.

#### Goldsky

A high-performance indexing solution that offers managed indexing infrastructure with advanced features like real-time indexing and customizable data transformations.