# Frequently Asked Questions

## What kind of data does Leandexer display?

Leandexer's indexing engine systematically captures every event emitted by a smart contract on a blockchain network. This advanced capability allows users to selectively filter the types of data they wish to access and display, either through Leandexer user interface or API.

For instance, a user who needs to track a specific smart contract address can choose to monitor one or multiple events (such as minting, burning, or transferring) from that smart contract and receive notifications about them.

## Which types of ERC tokens can Leandexer track?

Currently, Leandexer is able to track ERC-20 and ERC-3643 standards. The next release will include capabilities of tracking any kind of ERC standard thanks to a custom ABI allowing users to upload their own custom standard.

## Can historical data be retrieved from a previous block?

The indexing engine archives all blockchain data, storing it in a database. This enables querying of the entire blockchain history, from the genesis block to the latest transactions. It covers comprehensive historical details of smart contracts across supported blockchain networks.

## Can Leandexer handle chain reorganizations effectively?

The Leandexer indexing engine is adept at processing chain reorganizations, ensuring the delivery of coherent and accurate data.

## What types of events is Leandexer capable of indexing?

All types of events are indexed by Leandexer indexing engine.

## How many networks are compatible with Leandexer?

Leandexer is compatible with all EVM-based blockchain networks, including both public and private ones.

To begin indexing data with Leandexer on custom networks, simply input the appropriate RPC endpoint.

## Where the blockchain data come from ?

Blockchain data is sourced directly from nodes managed by a leading Blockchain infrastructure provider, guaranteeing uninterrupted access to data 24/7.

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