Understand market data access
How candles, quotes, trades, depth, and history depend on the connected source.
Data depends on the source
Live candles, quotes, trades, order book depth, and historical data depend on the broker, exchange, data feed, and subscription level.
Symbol coverage can differ
A symbol may be tradable but still require a separate market data permission or subscription.
Test before execution
Review data quality and symbol mapping in a controlled setup before using it for live decisions.