using System;
using System.Runtime.CompilerServices;

namespace TradingAPI
{
    class TradeAPI
    {
        static void Main()
        {
            string input;

            APICalls calls = new APICalls();
            TradeAPI main = new TradeAPI();

            input = calls.GetSpecificBalance("btcusd");
            Console.WriteLine(input);
            Console.ReadLine();
        }
    }
}


using System;
using RestSharp;
using System.Collections.Generic;
using System.Text;

namespace TradingAPI
{
    class APICalls
    {
        Authentication auth = new Authentication();
        Credentials c = new Credentials();

        #region || BITSTAMP API CALLS ||
        public string GetSpecificBalance(string pair1pair2)
        {
            c.SetResourceURL($"api/v2/balance/{pair1pair2}/");
            RestRequest request = new RestRequest($"api/v2/balance/{pair1pair2}/", Method.POST);
            var response = auth.BitstampAuthentication(request);
            Console.WriteLine(c.BIT_ResourceURL);
            return response;
        }
        #endregion

    }
}


using System;
using RestSharp;
using System.Collections.Generic;
using System.Text;

namespace TradingAPI
{
    class Authentication
    {
        readonly Encryption e = new Encryption();
        readonly Credentials c = new Credentials();

        #region || BITSTAMP API AUTHENTICATION ||
        public string BitstampAuthentication(RestRequest restRequest)
        {
            var signature = e.GetBitstampSignature(c.Nonce, c.BIT_Key, c.BIT_Secret, c.Timestamp, c.BIT_noSSLBaseURL, c.BIT_ResourceURL);

            restRequest.AddHeader("X-Auth", $"BITSTAMP {c.BIT_Key}");
            restRequest.AddHeader("X-Auth-Signature", signature);
            restRequest.AddHeader("X-Auth-Nonce", c.Nonce.ToString()); ;
            restRequest.AddHeader("X-Auth-Timestamp", c.Timestamp.ToString()); ;
            restRequest.AddHeader("X-Auth-Version", c.BIT_Version);

            RestClient client = new RestClient(c.BIT_BaseURL);
            IRestResponse response = client.Execute(restRequest);

            return response.Content;
        }
        #endregion
    }
}


using System;
using System.Security.Cryptography;
using System.Text;

namespace TradingAPI
{
    class Encryption
    {

        #region || HMAC ENCRYPTION ||
        public byte[] SignHMACSHA256(String key, byte[] data)
        {
            HMACSHA256 hashMaker = new HMACSHA256(Encoding.ASCII.GetBytes(key));
            return hashMaker.ComputeHash(data);
        }

        private byte[] StringToByteArray(string str)
        {
            return System.Text.Encoding.ASCII.GetBytes(str);
        }

        private string ByteArrayToString(byte[] hash)
        {
            return BitConverter.ToString(hash).Replace("-", "").ToLower();
        }
        #endregion

        #region || BITSTAMP SIGNATURE ENCRYPTION ||
        public string GetBitstampSignature(Guid nonce, string key, string secret, long timer, string baseURL, string resURL)
        {
            string msg = $"BITSTAMP {key}POST{baseURL}{resURL}{nonce}{timer}v2";
            Console.WriteLine(msg);
            return ByteArrayToString(SignHMACSHA256(secret, StringToByteArray(msg))).ToUpper();
        }
        #endregion

    }
}


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading;

namespace TradingAPI
{
    class Credentials
    {
        #region || GENERAL CREDENTIALS ||
        public long Timestamp { get; } = (long)(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1)).TotalMilliseconds);
        public Guid Nonce { get; } = Guid.NewGuid();
        #endregion

        #region || BITSTAMP CREDENTIALS ||
        public string BIT_Key { get; }  = "x";
        public string BIT_Secret { get; } = "x";
        public string BIT_BaseURL { get; } = "https://www.bitstamp.net/";
        public string BIT_noSSLBaseURL { get; } = "www.bitstamp.net/";

        public string BIT_ResourceURL;
        public string BIT_Version { get; set; } = "v2";
        #endregion

        public void SetResourceURL(string resourceURL)
        {
            BIT_ResourceURL = resourceURL;
        }
    }
}