How do I add API Endpoints in ASP.NET?

I would like to register API Endpoints in ASP.NET by just adding few methods in ApiController. A new method there means a new API.

In a random example below:

public class ProductController : ApiController

needs to serve the following Endpoints:

/
/price
/price/discount

Problem here is all endpoints are having a GET request to /, and result in same output as /.

Reference URL and Service Contract

You can place Route annotation at method for which you want to use custom route.

public class CustomersController : ApiController
{
    // this will be called on GET /Customers or api/Customers can't remember what default
    //config is
    public List<Customer> GetCustomers()
    {
        ...
    }

    // this will be called on GET /My/Route/Customers
    [HttpGet, Route("My/Route/Customers)]
    public List<Customer> GetCustomersFromMyRoute()
    {
        ...
    }

}