Question: I'm looking for a platform that allows me to integrate commission-free stock trading into my app or service.

If you want a platform to build commission-free stock trading into your app or service, Alpaca is a top contender. It's an API-based service that lets developers add stock, options and crypto trading with modern APIs and OAuth integration for secure key handling. Alpaca offers commission-free stock trading and supports several programming languages. The company also offers margin and short selling tools, so it's a good choice for businesses and individuals who want to build trading into their apps.

Another contender is FinChat. Although it's geared for institutional-quality financial data and analytics combined with conversational AI, you can use it to do deep research on investments, too. FinChat offers a customizable terminal, advanced data visualization, and a range of pricing options for different customers, so it's a good choice for both individual investors and financial services companies.

If you're interested in AI-generated signals and more advanced chart patterns, TradeUI could be a good choice. The service uses AI sentiment and option flow data to help you make trading decisions. It offers features like RealTime Signals, AI Sentiment and Automated Charts, and has a range of pricing plans for different trading needs.

Tradytics (project/tradytics) is another contender, particularly if you're interested in options flow data and AI tools. It offers premium options flow data, AI-powered news feeds and advanced analytics tools to help traders make decisions. With three pricing tiers, Tradytics is designed to span the gap between retail traders and Wall Street pros.