Alpaca is an API-first brokerage platform that provides APIs to stock, options, ETF and cryptocurrency trading, real time market data, and end-to-end brokerage infrastructure. Alpaca allows fintech start-ups, digital wallets, broker dealers, hedge fund managers, proprietary trading firms, algorithmic traders, robo advisors, and crypto exchanges to create investing apps and enable algorithmic trading. In 2015, Alpaca was founded in San Mateo, CA and now serves hundreds of businesses worldwide.
The founders were Tsuyoshi Yokokawa, Hitoshi Harada, and Yuki Hayashi who created an API-first stock brokerage platform.
They have raised over $138M across four+ rounds of funding which included their most recent Series C of $52M and they are supported by Y Combinator, Spark Capital, Tribe Capital and many other top tier investors.
The company completed its $52M Series C funding round one month ago and extended its growth phase.
They have also extended their strategic partnership with Citadel Securities so that Japanese investors can gain access to US Stocks and Options Trading.
Cloud-based multi-region with low-latency trading execution
Algorithmic trading APIs supporting ML trading strategies and pattern recognition capabilities
Technology stack from RocketReach profile; infrastructure inferred from broker API requirements
| Service | Cost | Details | Source |
|---|---|---|---|
| Retail Trading | $0 commissions | US listed stocks, ETFs, and options. No minimum deposit. | — |
| Elite All-in Plan | $0.0040 per share | Predictable cost structure including all fees and rebates (excluding regulatory fees). For advanced traders. | — |
| Elite Cost Plus Plan | $0.0025 or lower per share | Volume tiering commission on top of pass-through exchange fees/rebates. Rebates may offset costs. | — |
| Elite (Deposit $100,000+) | Unlocks benefits | Lower margin rate 4.75%, free market data ($99/mo value), white-glove support, ETB short-selling $0 borrow fees. | — |
| Algo Trader Plus API | $99/month | Market data subscription for individual algorithmic traders. Free with Elite $100k+ deposit. | — |
| Margin Rate (Non-Elite) | 6.25% | Base rate + 2.5%. | — |
| ACH Return Fee | $25 | Rejected ACH transfers. | — |
| Feature | Alpaca | Interactive Brokers | TradeStation | Robinhood |
|---|---|---|---|---|
| Core Functionality | Stocks/ETFs/Options/Crypto/Fixed Income API | Full-service trading + futures/forex | Futures/options focus | Retail stocks/ETFs/crypto |
| Pricing (Stocks) | $0 commissions | $0 commissions | $0 commissions | $0 commissions |
| API Trading | Yes (broker API) | Yes (TWS API) | Yes (EasyLanguage) | Limited |
| Free Tier Availability | Yes (retail) | No | No | Yes |
| Enterprise Features | Excess SIPC, white-glove | Yes (IBKR Pro) | Yes | No |
| Margin Rate (base) | 4.75-6.25% | Lower (tiered) | Competitive | 12%+ |
| Crypto Trading | Yes (select regions) | Yes | Yes | Yes |
| Fixed Income | Yes (bonds/T-bills) | Yes | No | No |
| Support Options | API docs + Elite white-glove | Phone/chat | Phone/chat | Chat/email |
Alpaca provides broker API integration that is designed specifically for developers and API-first fintech companies; IBKR offers more comprehensive access to professional traders and their broader range of tradable assets (including futures and forex), although it has a steeper learning curve. Alpaca has lower barriers to entry than IBKR, but also less access to markets globally.
Alpaca for embedded trading applications; IBKR for sophisticated multi-asset strategies.
TradeStation excels at providing advanced charting and proprietary platforms for active traders; Alpaca focuses solely on providing API-based access to its platform for use in algorithmic trading applications - without a visual interface. TradeStation is more cost effective for API data than Alpaca; however, TradeStation provides stronger visualization tools for retail users.
Alpaca for pure API automation; TradeStation for a trader workstation experience.
Robinhood is a consumer-focused mobile application; Alpaca is a B2B2C broker API. Robinhood has a large number of retail users; however, Robinhood does not provide a robust set of development tools; Alpaca allows for white-labeled trading experiences, but does not provide the same level of polish as Robinhood.
Alpaca for individual DIY investors; Robinhood for fintech platforms creating trading solutions.
Polygon specializes in providing market data APIs; Alpaca provides the entire stack of broker + execution + data. Alpaca is more expensive if you are only looking for data; however, Alpaca reduces the number of vendors you would have to interact with.
Alpaca for full-service trading; Polygon for data feeds that are specific to your needs.
Alpaca offers a commission-free REST API for automated trading. This allows developers to manage accounts, send orders and retrieve market data programmatically. Test by using paper trading prior to making trades with actual funds.
Commission-free trading for U.S. Stocks and ETFs is offered by Alpaca. Developers have free access to API; however, they will require a sales contact for custom pricing, additional enterprise features, and/or increased limits.
Alpaca is an API-first brokerage that provides a developer-friendly experience without a traditional UI platform, ideal for algorithmic trading. Interactive Brokers has greater numbers of asset classes and more complex tools than Alpaca, which will likely provide a higher degree of difficulty for API users.
Industry-standards of security are utilized by Alpaca including API Key Authentication and Encrypted Connections. Because Alpaca is a U.S.-regulated Brokerage Firm, client Funds are SIPC protected up to $500K; detailed information regarding Compliance can be obtained from Sales.
Yes, Alpaca's API supports integration into your own custom applications using official SDKs for both Python and JavaScript as well as standard REST Calls. The sandbox environment allows for paper trading to test integration without financial risk.
For brokerage-related issues, contact support@alpaca.markets; for developer-specific questions, use the Slack Community and Forums. Although Live Chat is available 24 hours/day, the Quality of Response may vary.
Yes, unlimited paper trading with simulated funds is provided at no cost to test strategies and API integrations without financial risk. There is no time limit, nor will a credit card be required to begin.
Primarily US Equities, Crypto, and ETFs; very limited International Market Access. Rate Limits exist and Phone Support is unavailable for Technical Issues; best suited for developers who are comfortable utilizing APIs.
A Developer-Centric, API-First Brokerage Platform is what Alpaca offers, ideal for Algorithmic Trading and Fintech Integrations. While Quality of Support is average with potential Delays, the Free Commission Model, Paper Trading, and Robust REST/WebSocket APIs offer significant value to Builders, rather than Traditional Retail Traders.
Alpaca is a developer brokerage API platform that is ideal for US-based algo trading; however, it lacks retail support and lacks global asset exposure.
Alpaca is a company that specializes in providing an API-first commission free brokerage for developers and fintech companies. Alpaca has a comprehensive suite of REST/web socket APIs, paper trading, and officially supported SDKs. Alpaca's support is rated as average with 24/7 live chat available however Alpaca reports email delays and there have been many user complaints on its forum. Alpaca appears to be best suited for algorithmic trading rather than for general retail investing.
Good - details from official site, BrokerChooser review, forums, GitHub. Limited direct access to current docs; no G2/Capterra ratings found; pricing/SLA details sparse.
There are numerous active Slack communities for developers and over ten thousand developers are participating in these communities. They have regular office hour meetings via YouTube where they cover a variety of topics such as: API examples; backtesting; WebSocket usage etc. In addition to office hour meetings, there are forums where developers can receive assistance from peers regarding developing trading strategies and SDKs.
TDAmeritrade has partnerships with broker-dealers, financial planners/advisors and fintech applications all around the world. TDAmeritrade also works with payment processors and identity verification providers. Their sales teams are available to assist with large-scale integrations for enterprises.
TDAmeritrade provides help articles specifically for businesses, individuals and developers in regards to API usage; pricing; accessing international markets and many other business-related items. Additionally, TDAmeritrade maintains GitHub repositories for the official SDKs where users can contribute and create additional content for the community.
TDAmeritrade conducts regular YouTube Office Hour sessions and demonstrates how to utilize the API while creating strategies; managing orders and backtesting. These sessions include utilizing WebSockets to stream data; scheduling trades and much more.
The Trading API enforces position and buying power limitations based upon the user's account information.
TDAmeritrade offers a risk-free environment to test strategies using actual market data.
The Trading API utilizes API-enforced limits on order size and leverage (up to 4x intraday).
Users can view their current account balances, equity and positions via the REST/WebSocket APIs.
Users can create natural language trading commands by integrating with services such as: Zapier; FlowHunt; and ChatGPT.
Users can place and manage trades in real-time using the REST/WebSocket APIs.
Users can test strategies without risking capital using real-time market data.
Users can implement spreads, straddles and condors using the API.
Users can obtain streaming quotes, trades and historical data feeds.
Users can monitor portfolios and automatically rebalance them in real-time using the REST/WebSocket APIs.
| Benchmark Criteria | Product Capability | Compliance Status | Notes |
|---|---|---|---|
| REST/WebSocket API standards | Full implementation | COMPLIANT | Python, Node.js, Go SDKs available |
| Paper trading environment | Real-time market data simulation | COMPLIANT | Identical to live trading API |
| Commission-free execution | Stocks, ETFs, options | COMPLIANT | Zero payment for order flow conflicts |
| Real-time data feeds | Quotes, trades, historical | COMPLIANT | Free tier + premium data available |
| OAuth 2.0 authentication | Enterprise-grade security | COMPLIANT | API key management dashboard |
| FIX protocol support | Institutional connectivity | PARTIAL | Available for enterprise clients |
| Multi-asset execution | Stocks/ETFs/Options/Crypto | COMPLIANT | Single API across asset classes |
