---
title: "QuantConnect"
description: "Purchase and download data from QuantConnect Datasets using Lean CLI."
canonical: https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect
markdown: https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect.md
language: python
source: https://github.com/QuantConnect/Documentation/tree/master/05%20Lean%20CLI/05%20Datasets/05%20QuantConnect
modified: 2026-10-29
index: https://www.quantconnect.com/llms.txt
---

# QuantConnect

[Documentation](https://www.quantconnect.com/docs/v2.md) > [Lean CLI](https://www.quantconnect.com/docs/v2/lean-cli.md) > Datasets > QuantConnect

> Code examples are shown in Python. Append `?lang=csharp` to this URL for the C# version of this page.

QuantConnect was founded in 2012 to serve quants everywhere with the best possible algorithmic trading technology. Seeking to disrupt a notoriously closed-source industry, QuantConnect takes a radically open-source approach to algorithmic trading. Through the QuantConnect web platform, more than 50,000 quants are served every month.

To locally run the LEAN engine, you need local data. We recommend you source local data from our [Dataset Market](https://www.quantconnect.com/datasets), so you can use the same data that is available to your algorithm when you run it in the cloud. There are two methods of downloading data. You can download smaller discrete datasets at a low cost or download complete collections in bulk to avoid selection bias.

- [Key Concepts](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/key-concepts.md): Key concepts for downloading data with the CLI
- [US Equity](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/us-equity.md): Download US Equity trade and quote data
- [Equity Options](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/equity-options.md): Download US Equity Options data
- [Forex](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/forex.md): Download Forex data
- [Futures](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/futures.md): Download US Futures data
- [Future Options](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/future-options.md): Download US Future Options data
- [Index Options](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/index-options.md): Download US Index Options data
- [CFD](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/cfd.md): Download CFD data
- [US Equity Coarse Fundamental](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/us-equity-coarse-fundamental.md): Download US Equity coarse fundamental universe data
- [US ETF Constituents](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/us-etf-constituents.md): Download US ETF constituents data

### See Also

- [Datasets](https://www.quantconnect.com/docs/v2/writing-algorithms/datasets/overview.md)

## Pages in This Section

- [Key Concepts](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/key-concepts.md): Downloading data by the ticker is the ideal, low cost option to aquiring local trading data.
- [US Equity](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/us-equity.md): Download and update the US Equities dataset through the LEAN CLI.
- [Equity Options](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/equity-options.md): Download and update the US Equity Options dataset through the LEAN CLI.
- [Forex](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/forex.md): Download and update the FOREX dataset through the LEAN CLI.
- [Futures](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/futures.md): Download and update the US Futures dataset through the LEAN CLI.
- [Future Options](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/future-options.md): Download and update the US Future Options dataset through the LEAN CLI.
- [Index Options](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/index-options.md): Download and update the US Index Options dataset through the LEAN CLI.
- [CFD](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/cfd.md): Download and update the CFD dataset through the LEAN CLI.
- [US Equity Coarse Fundamental](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/us-equity-coarse-fundamental.md): Download and update the US Equity Coarse Universe dataset through the LEAN CLI.
- [US ETF Constituents](https://www.quantconnect.com/docs/v2/lean-cli/datasets/quantconnect/us-etf-constituents.md): Download and update the US ETF Constituents dataset through the LEAN CLI.