To access the API data for a lead trader for copy trading, normally one requires the following steps:

Select a Platform: Choose a copy trading platform, such as Combiz Services Pvt Ltd, which allows the integration of API. Register and Authenticate Register with the platform to receive your API key for authentication.

API Integration: The use of API documentation is provided to integrate the entire platform into your trading system.

Data Access: Once combined, data available for lead traders such as trading signals, positions, and performance would be accessible via API calls.

Ensure you follow all security measures and platform guidelines to protect your data.