where do i begin the json statement to login and authorise my API token where i have an open 'BUY...

5ew5ja · August 2021

so where do i begin the json statement to login and authorise my API token where i have an open 'BUY' position but want to develop my
script with MA conditions to adjust my 'BUY' and 'SELL' according to price action .My DTRADER is trading the Volatility 25 Index , so i wish to
monitor my price action by as if continuous automated scanning that almost anticipates ahead of market value to make that calculative decision on appropriate SL or TP or Trailing Stop Loss . So to begin the json script to program at the API PLAYGROUND please send me
information to begin the initial steps .

michael_mueller · August 2021

Hi @5ew5ja
Here is a sample in C# of buying a contract. It seems what you would need to add to this a subscribe to a tick stream and when the price matched what you want send a buy request.

using System;
using System.Text;
using System.Threading.Tasks;
using System.Net.WebSockets;
using System.Threading;
using System.Net;
using Newtonsoft.Json.Linq;
/*
 * This is an example of using C# to buy a contract.
 * This is a simple script as it does not check if the account has access to the
 * asset before placing the trade. You can use `asset_index` call https://developers.deriv.com/playground/#asset_index to check this
 * The example was originally written in dotnet version 5.0.  
 * it uses the Newtonsoft Json.net Library https://www.newtonsoft.com/json
 * This can be run on Windows/linux or Mac
 *  
 * To run this example 
 * - Ensure you have dotnet SDK installed https://dotnet.microsoft.com/download/dotnet. 
 * - Run `dotnet new console --output buy_contract` In a dir on your computer
 * - Then run `dotnet add buy_contract package Newtonsoft.Json` 
 * - Change to the new buy_contract dir and edit the `Program.cs` file, paste in the contents of this script and save.
 * - Run `dotnet run --project buy_contract ` in the parent dir.  
 *
 * The api token should be from the same account that the contract is to be purchased for.
 */
namespace DerivWSDemo
{
    class DerivWS
    {
        private ClientWebSocket ws = new ClientWebSocket();

        private string app_id = "1089"; // Change this to yor app_id. Get it from here https://developers.deriv.com/docs/app-registration/
        public static string token = ""; //Change this to your token. Get it from here https://app.deriv.com/account/api-token 
        private string websocket_url = "wss://ws.binaryws.com/websockets/v3?app_id=";

        public async Task SendRequest(string data)
        {

            while (this.ws.State == WebSocketState.Connecting) { };
            if (this.ws.State != WebSocketState.Open)
            {
                throw new Exception("Connection is not open.");
            }

            var reqAsBytes = Encoding.UTF8.GetBytes(data);
            var ticksRequest = new ArraySegment<byte>(reqAsBytes);

            await this.ws.SendAsync(ticksRequest,
                WebSocketMessageType.Text,
                true,
                CancellationToken.None);

            Console.WriteLine("The request has been sent: ");
            Console.WriteLine(data);
            Console.WriteLine("\r\n \r\n");


        }

        public async Task StartListen()
        {
            WebSocketReceiveResult result;
            while (this.ws.State == WebSocketState.Open)
            {
                var buffer = new ArraySegment<byte>(new byte[4096]);
                result = await this.ws.ReceiveAsync(new ArraySegment<byte>(buffer.Array), CancellationToken.None);

                if (result.MessageType == WebSocketMessageType.Close)
                {
                    Console.WriteLine("Connection Closed!");
                    break;
                }
                else
                {
                    var str = Encoding.UTF8.GetString(buffer.Array, 0, result.Count);
                    // Console.WriteLine(str); //uncomment to see full json response
                    JObject resultObject = JObject.Parse(str);
                    /*
                    * Since we can not ensure calls to websocket are made in order we must wait for 
                    * the response to the authorize call before sending the buy request. 
                    */
                    if ((resultObject["error"] != null))
                    {
                        Console.WriteLine(resultObject["error"]["code"]);
                        Console.WriteLine(resultObject["error"]["message"]);
                    }
                    else if (string.Equals((string)resultObject["msg_type"], "authorize"))
                    {
                        string parameters = " \"parameters\": { \"amount\": 10, \"basis\": \"stake\", \"contract_type\": \"CALL\", \"currency\": \"USD\", \"duration\": 1, \"duration_unit\": \"m\", \"symbol\": \"R_10\" }}";
                        string data = "{\"buy\": 1, \"subscribe\": 1, \"price\": 10," + parameters;
                        this.SendRequest(data).Wait();
                    }
                    else if (string.Equals((string)resultObject["msg_type"], "buy"))
                    {
                        Console.WriteLine("contract Id {0}", resultObject["buy"]["contract_id"]);
                        Console.WriteLine("Details {0}", resultObject["buy"]["longcode"]);
                    }
                    else if (string.Equals((string)resultObject["msg_type"], "buy"))
                    {
                        Console.WriteLine("contract Id {0}", resultObject["buy"]["contract_id"]);
                        Console.WriteLine("Details {0}", resultObject["buy"]["longcode"]);
                    }
                    else if (string.Equals((string)resultObject["msg_type"], "proposal_open_contract"))
                    { //Because we subscribed to the buy request we will receive updates on our open contract. 
                        bool isSold = (bool)resultObject["proposal_open_contract"]["is_sold"];
                        if (isSold)
                        { //if `isSold` is true it means our contract has finished and we can see if we won or not.
                            Console.WriteLine("Contract {0}", resultObject["proposal_open_contract"]["status"]);
                            Console.WriteLine("Profit {0}", resultObject["proposal_open_contract"]["profit"]);
                            ws.Abort();
                            ws.Dispose();
                        }
                        else
                        { // we can track the status of our contract as updates to the spot price occur. 
                            float currentSpot = (float)resultObject["proposal_open_contract"]["current_spot"];
                            float entrySpot = 0;
                            if (!String.IsNullOrEmpty((string)resultObject["proposal_open_contract"]["entry_tick"]))
                            {
                                entrySpot = (float)resultObject["proposal_open_contract"]["entry_tick"];
                            }
                            Console.WriteLine("Entry spot {0}", entrySpot);
                            Console.WriteLine("Current spot {0}", currentSpot);
                            Console.WriteLine("Difference {0}", (currentSpot - entrySpot));
                            Console.WriteLine("\r\n");
                        }
                    }
                }
            }
        }

        public async Task Connect()
        {

            Uri uri = new Uri(websocket_url + app_id);
            Console.WriteLine("Prepare to connect to: " + uri.ToString());
            Console.WriteLine("\r\n");
            //WebProxy proxyObject = new WebProxy("http://172.30.160.1:1090",true); //these 2 lines allow proxying set the proxy url as needed
            //ws.Options.Proxy = proxyObject;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11;
            await ws.ConnectAsync(uri, CancellationToken.None);

            Console.WriteLine("The connection is established!");
            Console.WriteLine("\r\n");
        }

        static void Main(string[] args)
        {
            var bws = new DerivWS();
            bws.Connect().Wait();

            string data = "{ \"authorize\": \"" + token + "\"}";
            bws.SendRequest(data).Wait();
            bws.StartListen().Wait();

        }
    }
}

5ew5ja · August 2021

compliments to Michael Mueller -
DERIV community what do you think of Michael Mueller,s supportive example to our benefit . Good fortune !!

5ew5ja · September 2021

@michael_mueller said:
Hi @5ew5ja
Here is a sample in C# of buying a contract. It seems what you would need to add to this a subscribe to a tick stream and when the price matched what you want send a buy request.

using System;
using System.Text;
using System.Threading.Tasks;
using System.Net.WebSockets;
using System.Threading;
using System.Net;
using Newtonsoft.Json.Linq;
/*
 * This is an example of using C# to buy a contract.
 * This is a simple script as it does not check if the account has access to the
 * asset before placing the trade. You can use `asset_index` call https://developers.deriv.com/playground/#asset_index to check this
 * The example was originally written in dotnet version 5.0.  
 * it uses the Newtonsoft Json.net Library https://www.newtonsoft.com/json
 * This can be run on Windows/linux or Mac
 *  
 * To run this example 
 * - Ensure you have dotnet SDK installed https://dotnet.microsoft.com/download/dotnet. 
 * - Run `dotnet new console --output buy_contract` In a dir on your computer
 * - Then run `dotnet add buy_contract package Newtonsoft.Json` 
 * - Change to the new buy_contract dir and edit the `Program.cs` file, paste in the contents of this script and save.
 * - Run `dotnet run --project buy_contract ` in the parent dir.  
 *
 * The api token should be from the same account that the contract is to be purchased for.
 */
namespace DerivWSDemo
{
    class DerivWS
    {
        private ClientWebSocket ws = new ClientWebSocket();

        private string app_id = "1089"; // Change this to yor app_id. Get it from here https://developers.deriv.com/docs/app-registration/
        public static string token = ""; //Change this to your token. Get it from here https://app.deriv.com/account/api-token 
        private string websocket_url = "wss://ws.binaryws.com/websockets/v3?app_id=";

        public async Task SendRequest(string data)
        {

            while (this.ws.State == WebSocketState.Connecting) { };
            if (this.ws.State != WebSocketState.Open)
            {
                throw new Exception("Connection is not open.");
            }

            var reqAsBytes = Encoding.UTF8.GetBytes(data);
            var ticksRequest = new ArraySegment<byte>(reqAsBytes);

            await this.ws.SendAsync(ticksRequest,
                WebSocketMessageType.Text,
                true,
                CancellationToken.None);

            Console.WriteLine("The request has been sent: ");
            Console.WriteLine(data);
            Console.WriteLine("\r\n \r\n");


        }

        public async Task StartListen()
        {
            WebSocketReceiveResult result;
            while (this.ws.State == WebSocketState.Open)
            {
                var buffer = new ArraySegment<byte>(new byte[4096]);
                result = await this.ws.ReceiveAsync(new ArraySegment<byte>(buffer.Array), CancellationToken.None);

                if (result.MessageType == WebSocketMessageType.Close)
                {
                    Console.WriteLine("Connection Closed!");
                    break;
                }
                else
                {
                    var str = Encoding.UTF8.GetString(buffer.Array, 0, result.Count);
                    // Console.WriteLine(str); //uncomment to see full json response
                    JObject resultObject = JObject.Parse(str);
                    /*
                    * Since we can not ensure calls to websocket are made in order we must wait for 
                    * the response to the authorize call before sending the buy request. 
                    */
                    if ((resultObject["error"] != null))
                    {
                        Console.WriteLine(resultObject["error"]["code"]);
                        Console.WriteLine(resultObject["error"]["message"]);
                    }
                    else if (string.Equals((string)resultObject["msg_type"], "authorize"))
                    {
                        string parameters = " \"parameters\": { \"amount\": 10, \"basis\": \"stake\", \"contract_type\": \"CALL\", \"currency\": \"USD\", \"duration\": 1, \"duration_unit\": \"m\", \"symbol\": \"R_10\" }}";
                        string data = "{\"buy\": 1, \"subscribe\": 1, \"price\": 10," + parameters;
                        this.SendRequest(data).Wait();
                    }
                    else if (string.Equals((string)resultObject["msg_type"], "buy"))
                    {
                        Console.WriteLine("contract Id {0}", resultObject["buy"]["contract_id"]);
                        Console.WriteLine("Details {0}", resultObject["buy"]["longcode"]);
                    }
                    else if (string.Equals((string)resultObject["msg_type"], "buy"))
                    {
                        Console.WriteLine("contract Id {0}", resultObject["buy"]["contract_id"]);
                        Console.WriteLine("Details {0}", resultObject["buy"]["longcode"]);
                    }
                    else if (string.Equals((string)resultObject["msg_type"], "proposal_open_contract"))
                    { //Because we subscribed to the buy request we will receive updates on our open contract. 
                        bool isSold = (bool)resultObject["proposal_open_contract"]["is_sold"];
                        if (isSold)
                        { //if `isSold` is true it means our contract has finished and we can see if we won or not.
                            Console.WriteLine("Contract {0}", resultObject["proposal_open_contract"]["status"]);
                            Console.WriteLine("Profit {0}", resultObject["proposal_open_contract"]["profit"]);
                            ws.Abort();
                            ws.Dispose();
                        }
                        else
                        { // we can track the status of our contract as updates to the spot price occur. 
                            float currentSpot = (float)resultObject["proposal_open_contract"]["current_spot"];
                            float entrySpot = 0;
                            if (!String.IsNullOrEmpty((string)resultObject["proposal_open_contract"]["entry_tick"]))
                            {
                                entrySpot = (float)resultObject["proposal_open_contract"]["entry_tick"];
                            }
                            Console.WriteLine("Entry spot {0}", entrySpot);
                            Console.WriteLine("Current spot {0}", currentSpot);
                            Console.WriteLine("Difference {0}", (currentSpot - entrySpot));
                            Console.WriteLine("\r\n");
                        }
                    }
                }
            }
        }

        public async Task Connect()
        {

            Uri uri = new Uri(websocket_url + app_id);
            Console.WriteLine("Prepare to connect to: " + uri.ToString());
            Console.WriteLine("\r\n");
            //WebProxy proxyObject = new WebProxy("http://172.30.160.1:1090",true); //these 2 lines allow proxying set the proxy url as needed
            //ws.Options.Proxy = proxyObject;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11;
            await ws.ConnectAsync(uri, CancellationToken.None);

            Console.WriteLine("The connection is established!");
            Console.WriteLine("\r\n");
        }

        static void Main(string[] args)
        {
            var bws = new DerivWS();
            bws.Connect().Wait();

            string data = "{ \"authorize\": \"" + token + "\"}";     (can the "authorise\":\ + token + "\")  be typed into the  'REQUEST FIELD ' to 
            bws.SendRequest(data).Wait();                                      have 'success' as  REQUEST for authorisation on the API PLAYGROUND ?)
            bws.StartListen().Wait();

        }

}

where do i begin the json statement to login and authorise my API token where i have an open 'BUY...

Answers