读取coinbase api时无法获取newtonsoft.Json.LinqJvalue上的子值？

using Newtonsoft.Json.Linq;
using System;
using System.Net;

public class Program
{
    public static void Main()
    {
        string apiUrl = "https://api.coinbase.com/v2/prices/BTC-USD/spot";
        
        using (WebClient client = new WebClient())
        {
            string json = client.DownloadString(apiUrl);
            JObject jsonObject = JObject.Parse(json);
            
            JToken amountToken = jsonObject["data"]["amount"];
            if (amountToken != null)
            {
                string amount = amountToken.ToString();
                Console.WriteLine("BTC-USD spot price: " + amount);
            }
            else
            {
                Console.WriteLine("Failed to retrieve BTC-USD spot price.");
            }
        }
    }
}