GDAX API Client Library (C# / .NET Core)
var baseUrl = "https://api.gdax.com/";
var apiKey = "<api-key>";
var secret = "<secret>";
var passphrase = "<passphrase>";
var requestAuthenticator = new RequestAuthenticator(apiKey, passphrase, secret);
var productClient = new ProductClient(baseUrl, requestAuthenticator);
var productResponse = await productClient.GetProductTickerAsync("BTC-USD");
if(productResponse.StatusCode == HttpStatusCode.OK)
{
var ticker = productResponse.Value;
Console.WriteLine("Price: {0}", ticker.price);
}