Alpaca

Alpaca Broker API provides trading and market data. Accounts hold positions; activities log trades; assets/calendar/clock are reference data.

Data Model

• Accounts are brokerage accounts. Documents (statements, etc.) are account-scoped — need acc_id.
• Activities are account events (trades, transfers). Assets are tradable securities.
• Calendar returns market days. Clock returns market open/close status.
• Country info supports compliance. Documents require account id.

Gotchas

• acc_id required: Account-scoped tools (documents, activities) need account id from listing accounts.
• Market hours: Use clock to check if market is open before trading operations.