Market Data Alpaca Data API v2 Alpaca Data API v2 provides market data in 2 two different plans, Free and Unlimited. The Free plan is included in both paper-only and live trading accounts as the default plan for free. Alpaca Data API v1 Alpaca Data API v1 provides the market data available to the client user through the REST and websocket streaming interfaces and it consolidates data sources from five different exchanges. Suggestions or questions? We're always happy to hear from you. You can contribute to these docs on GitHub, or you can join our Community Forum or Community Slack to get help from other community members and the Alpaca team.