Hack Financial Systems

Alpaca API lets you build and trade with real-time market data for free.

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Technology and services are offered by AlpacaDB, Inc. Securities are offered through Alpaca Securities LLC

Commission Free
Stock Trading API

With Alpaca Securities LLC’s commission-free API, you can run algorithmic trading & portfolio management bots and build your own mobile app with ease.

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Commission Free Stock Trading
Alpaca is a Registered Securities Broker

Registered Securities Broker

Alpaca Securities LLC is a member of FInancial Industry Regulatory Authority, Inc. (FINRA). You can check the background of Alpaca Securities on FINRA’s BrokerCheck. Alpaca Securities is also a member of SIPC - securities in your account are protected up to $500,000. For details, please visit www.sipc.org.

Built For Makers
In Open source & Community

We truly believe open source changes the financial systems and how we interact with them. Alpaca grows with our community and knowledges we build together.


Technology and services are offered by AlpacaDB, Inc.

What our Users are Saying


Finally, a professional and easy to use API to connect to the markets courtesy of Alpaca. Their team is the real deal. I can't wait to see what's next.


John S.
from Stamford, CT


I love Alpaca and their API first approach to trading, I now can add smarter rules for buying and selling stocks for free.


Kiran H.
Software Engineer, San Francisco


The Alpaca API is elegant, fast, and easy to understand and work with.


Jesse C.
Software Engineer, Seattle

These testimonials may not be representative of the experience of other customers and are not a guarantee of future performance or success. Technology and services are offered by AlpacaDB, Inc.

Free features. Forever.

Market Data

REST API + WebSocket stream

Agile Management Dashboard

Unlimited Live Paper Trading