> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gomaestro.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Blockchain Indexer

> Blockchain indexer infrastructure for Web3 applications providing optimized on-chain data access across Bitcoin, Cardano, and Dogecoin networks.

A blockchain indexer is a key piece of infrastructure required to power any Web3 ecosystem. It provides applications with access to a wide range of on-chain data through a flexible and optimized interface. One well-known example is [**The Graph**](https://thegraph.com/en/), a popular blockchain indexer on Ethereum, which simplifies data availability for Web3 applications.

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  <img src="https://mintcdn.com/gomaestroinc/8PISEioy97Ta9gmw/images/Gtwhlf9BeqPdAg4DmZ-pP-aeEWwEuLyMhuYfAydDNQC-20240919-172304.gif?s=5aa8c10e36ee9c8a7e6a25d47e98970b" alt="" width="990" height="840" data-path="images/Gtwhlf9BeqPdAg4DmZ-pP-aeEWwEuLyMhuYfAydDNQC-20240919-172304.gif" />
</Frame>

***

# Service Availability

The Blockchain Indexer service is available on the following blockchains:

| Service                | Bitcoin                                                   | Cardano                                                   | Dogecoin                                                   |
| :--------------------- | :-------------------------------------------------------- | :-------------------------------------------------------- | :--------------------------------------------------------- |
| **Blockchain Indexer** | [API Reference](/bitcoin/blockchain-indexer-api/overview) | [API Reference](/cardano/blockchain-indexer-api/overview) | [API Reference](/dogecoin/blockchain-indexer-api/overview) |

***

# Indexing Data

## Real-Time Data

Maestro’s blockchain indexer is specifically optimized for [**UTXO**](https://docs.cardano.org/learn/eutxo-explainer)\*\* ledger primitives\*\* and focuses on delivering both **real-time data liveness** and **data accuracy**. Blockchains operate as an **event-driven system** with probabilistic transaction finality, meaning the ledger’s "ground truth" isn't instantly finalized—it can take some time to reach global consensus.

<Note>
  Learn More: What are chain [reorgs](https://learnmeabitcoin.com/technical/blockchain/chain-reorganisation/) or [rollbacks](https://plutus-apps.readthedocs.io/en/latest/plutus/explanations/rollback.html)?
</Note>

Accessing “real-time” onchain data requires rigorous data integrity checks. Traditional solutions, like adding a **block buffer** to indexers, only mitigate rollbacks by providing outdated data.

Maestro has designed a system that handles rollbacks gracefully and in **real-time**, giving users live data without sacrificing data integrity. Let's take a closer look at the components that make up the indexer:

1. **Indexer** - Specialized pipelines that extract, match, and process on-chain information, including handling rollbacks.
2. **Storage** - A data lake optimized for storing various types of data.
3. **Access** - A REST API providing flexible and performant querying capabilities.

***

## Common Use Cases

Accurate and live on-chain data is critical for delivering an optimal user experience in blockchain applications. Some common use cases  for blockchain indexers include:

* **Smart contract-based dApps** – Time-sensitive DeFi apps like DEXs, NFT marketplaces, lending protocols, games, and metaverses.
* **Wallets and Decentralized IDs (DIDs)** – Real-time UTxO states are crucial for Cardano wallets, cross-chain wallets, and DID systems.
* **Blockchain explorers** – Analytics platform require reliable access to large sets of on-chain data.
* **Bridges & Web2 integrations** – Blockchain bridges and integrations with traditional Web2 software require access to on-chain information.