diff --git a/5sim_api/5sim_api.csproj b/5sim_api/5sim_api.csproj
index 2c08497..ea2d910 100644
--- a/5sim_api/5sim_api.csproj
+++ b/5sim_api/5sim_api.csproj
@@ -5,4 +5,9 @@
     <RootNamespace>_5sim_api</RootNamespace>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="RestSharp" Version="106.10.1" />
+  </ItemGroup>
+
 </Project>
diff --git a/5sim_api/Api.cs b/5sim_api/Api.cs
new file mode 100644
index 0000000..001b243
--- /dev/null
+++ b/5sim_api/Api.cs
@@ -0,0 +1,286 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using RestSharp;
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Text;
+using YoutubeBot._5sim.Exceptions;
+using YoutubeBot._5sim.Objects;
+
+namespace YoutubeBot._5sim
+{
+    public class Api
+    {
+        public const string endpoint = "https://5sim.net/v1/";
+        private const string referral_key = null;
+
+        string token;
+        private RestClient client = new RestClient(endpoint);
+
+        public Api(string token)
+        {
+            this.token = token;
+        }
+
+
+        public Service getService(string service_name, string country = "any", string carrier = "any")
+        {
+            String uri = $"guest/products/{country}/{carrier}";
+            RestRequest request = new RestRequest(uri, Method.GET);
+
+            IRestResponse response = client.Execute(request);
+
+            // Client-error handling
+            Exception ex = response.ErrorException;
+            if (ex != null) throw ex;
+
+            // Check for expected errors and throw the corresponding exception of necessary
+            checkAndThrowException(response.StatusCode, response.Content);
+
+            if (response.StatusCode == HttpStatusCode.OK)
+            {
+                JObject services_json = (JObject)JsonConvert.DeserializeObject(response.Content);
+
+                JObject service_json = (JObject)services_json[service_name];
+                return service_json.ToObject<Service>();
+            }
+            else
+                throw new InvalidOperationException($"Invalid response: {response.StatusCode}");
+        }
+
+        public Account getAccount()
+        {
+            String uri = "user/profile";
+            RestRequest request = new RestRequest(uri, Method.GET);
+
+            request.AddHeader("Authorization", $"Bearer {token}");
+
+            IRestResponse response = client.Execute(request);
+
+            // Client-error handling
+            Exception ex = response.ErrorException;
+            if (ex != null) throw ex;
+
+            // Check for expected errors and throw the corresponding exception of necessary
+            checkAndThrowException(response.StatusCode, response.Content);
+
+            if (response.StatusCode == HttpStatusCode.OK)
+            {
+                JObject account_json = (JObject)JsonConvert.DeserializeObject(response.Content);
+                return account_json.ToObject<Account>();
+            }
+            else
+                throw new InvalidOperationException($"Invalid response: {response.StatusCode}");
+        }
+
+        /// <summary>
+        /// Buy a activation-number
+        /// </summary>
+        public Number buyActivationNumber(string service_name, string country = "any", string carrier = "any")
+        {
+            return buyNumber("activation", service_name, country, carrier);
+        }
+        /// <summary>
+        /// Buy a hosting-number
+        /// </summary>
+        /// <param name="duration">One of: {3hours, 1day}</param>
+        public Number buyHostingNumber(string duration, string country = "any", string carrier = "any")
+        {
+            return buyNumber("hosting", duration, country, carrier);
+        }
+        public Number buyNumber(string type, string product, string country = "any", string provider = "any")
+        {
+            String uri = $"user/buy/{type}/{country}/{provider}/{product}";
+            RestRequest request = new RestRequest(uri, Method.GET);
+
+            // Add referral_key if any
+            if (!String.IsNullOrEmpty(referral_key)) request.AddQueryParameter("ref", referral_key);
+
+            request.AddHeader("Authorization", $"Bearer {token}");
+
+            IRestResponse response = client.Execute(request);
+
+            // Client-error handling
+            Exception ex = response.ErrorException;
+            if (ex != null) throw ex;
+
+            // Check for expected errors and throw the corresponding exception of necessary
+            checkAndThrowException(response.StatusCode, response.Content);
+
+            if (response.StatusCode == HttpStatusCode.OK)
+            {
+                JObject activationNumber_json = (JObject)JsonConvert.DeserializeObject(response.Content);
+
+                Number activationNumber = activationNumber_json.ToObject<Number>();
+                activationNumber.carrier = (string)activationNumber_json["operator"];
+                return activationNumber;
+            }
+            else
+                throw new InvalidOperationException($"Invalid response: {response.StatusCode}");
+        }
+
+
+        public Number checkNumber(int id)
+        {
+            String uri = $"user/check/{id}";
+            RestRequest request = new RestRequest(uri, Method.GET);
+
+            request.AddHeader("Authorization", $"Bearer {token}");
+
+            IRestResponse response = client.Execute(request);
+
+            // Client-error handling
+            Exception ex = response.ErrorException;
+            if (ex != null) throw ex;
+
+            // Check for expected errors and throw the corresponding exception of necessary
+            checkAndThrowException(response.StatusCode, response.Content);
+
+            if (response.StatusCode == HttpStatusCode.OK)
+            {
+                JObject activationNumber_json = (JObject)JsonConvert.DeserializeObject(response.Content);
+
+                Number activationNumber = activationNumber_json.ToObject<Number>();
+                activationNumber.carrier = (string)activationNumber_json["operator"];
+                return activationNumber;
+            }
+            else
+                throw new InvalidOperationException($"Invalid response: {response.StatusCode}");
+        }
+
+        public Number finishNumber(int id)
+        {
+            String uri = $"user/finish/{id}";
+            RestRequest request = new RestRequest(uri, Method.GET);
+
+            request.AddHeader("Authorization", $"Bearer {token}");
+
+            IRestResponse response = client.Execute(request);
+
+            // Client-error handling
+            Exception ex = response.ErrorException;
+            if (ex != null) throw ex;
+
+            // Check for expected errors and throw the corresponding exception of necessary
+            checkAndThrowException(response.StatusCode, response.Content);
+
+            if (response.StatusCode == HttpStatusCode.OK)
+            {
+                JObject activationNumber_json = (JObject)JsonConvert.DeserializeObject(response.Content);
+
+                Number activationNumber = activationNumber_json.ToObject<Number>();
+                activationNumber.carrier = (string)activationNumber_json["operator"];
+                return activationNumber;
+            }
+            else
+                throw new InvalidOperationException($"Invalid response: {response.StatusCode}");
+        }
+
+        public Number cancelNumber(int id)
+        {
+            String uri = $"user/cancel/{id}";
+            RestRequest request = new RestRequest(uri, Method.GET);
+
+            request.AddHeader("Authorization", $"Bearer {token}");
+
+            IRestResponse response = client.Execute(request);
+
+            // Client-error handling
+            Exception ex = response.ErrorException;
+            if (ex != null) throw ex;
+
+            // Check for expected errors and throw the corresponding exception of necessary
+            checkAndThrowException(response.StatusCode, response.Content);
+
+            if (response.StatusCode == HttpStatusCode.OK)
+            {
+                JObject activationNumber_json = (JObject)JsonConvert.DeserializeObject(response.Content);
+
+                Number activationNumber = activationNumber_json.ToObject<Number>();
+                activationNumber.carrier = (string)activationNumber_json["operator"];
+                return activationNumber;
+            }
+            else
+                throw new InvalidOperationException($"Invalid response: {response.StatusCode}");
+        }
+
+        public Number banNumber(int id)
+        {
+            String uri = $"user/ban/{id}";
+            RestRequest request = new RestRequest(uri, Method.GET);
+
+            request.AddHeader("Authorization", $"Bearer {token}");
+
+            IRestResponse response = client.Execute(request);
+
+            // Client-error handling
+            Exception ex = response.ErrorException;
+            if (ex != null) throw ex;
+
+            // Check for expected errors and throw the corresponding exception of necessary
+            checkAndThrowException(response.StatusCode, response.Content);
+
+            if (response.StatusCode == HttpStatusCode.OK)
+            {
+                JObject activationNumber_json = (JObject)JsonConvert.DeserializeObject(response.Content);
+
+                Number activationNumber = activationNumber_json.ToObject<Number>();
+                activationNumber.carrier = (string)activationNumber_json["operator"];
+                return activationNumber;
+            }
+            else
+                throw new InvalidOperationException($"Invalid response: {response.StatusCode}");
+        }
+
+
+
+
+        // ----------
+
+        private static void checkAndThrowException(HttpStatusCode statusCode, string content)
+        {
+            switch (statusCode)
+            {
+                case HttpStatusCode.OK:
+                    switch (content)
+                    {
+                        case "no free phones":
+                            throw new NoFreePhonesException();
+                    }
+                    break;
+
+                case HttpStatusCode.BadRequest:
+                    switch (content)
+                    {
+                        case "not enough product qty":
+                            throw new NotEnoughProductQuantityException();
+
+                        case "not enough user balance":
+                            throw new NotEnoughUserBalanceException();
+
+                        case "not enough rating":
+                            throw new NotEnoughRatingException();
+                    }
+                    break;
+
+                case HttpStatusCode.NotFound:
+                    switch (content)
+                    {
+                        case "order not found":
+                            throw new OrderNotFoundException();
+
+                        case "order expired":
+                            throw new OrderExpiredException();
+
+                        case "order has sms":
+                            throw new OrderHasSmsException();
+
+                        case "hosting order":
+                            throw new HostingOrderException();
+                    }
+                    break;
+            }
+        }
+    }
+}
diff --git a/5sim_api/Class1.cs b/5sim_api/Class1.cs
deleted file mode 100644
index 7836e12..0000000
--- a/5sim_api/Class1.cs
+++ /dev/null
@@ -1,8 +0,0 @@
-using System;
-
-namespace _5sim_api
-{
-    public class Class1
-    {
-    }
-}
diff --git a/5sim_api/Exceptions/HostingOrderException.cs b/5sim_api/Exceptions/HostingOrderException.cs
new file mode 100644
index 0000000..37ce801
--- /dev/null
+++ b/5sim_api/Exceptions/HostingOrderException.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Exceptions
+{
+    [Serializable]
+    class HostingOrderException : Exception
+    {
+        public HostingOrderException()
+        {
+        }
+        public HostingOrderException(String message)
+            : base(message)
+        { 
+        }
+    }
+}
diff --git a/5sim_api/Exceptions/NoFreePhonesException.cs b/5sim_api/Exceptions/NoFreePhonesException.cs
new file mode 100644
index 0000000..7c53b6f
--- /dev/null
+++ b/5sim_api/Exceptions/NoFreePhonesException.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Exceptions
+{
+    [Serializable]
+    class NoFreePhonesException : Exception
+    {
+        public NoFreePhonesException()
+        {
+        }
+        public NoFreePhonesException(String message)
+            : base(message)
+        { 
+        }
+    }
+}
diff --git a/5sim_api/Exceptions/NotEnoughProductQuantityException.cs b/5sim_api/Exceptions/NotEnoughProductQuantityException.cs
new file mode 100644
index 0000000..99f73ce
--- /dev/null
+++ b/5sim_api/Exceptions/NotEnoughProductQuantityException.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Exceptions
+{
+    [Serializable]
+    class NotEnoughProductQuantityException : Exception
+    {
+        public NotEnoughProductQuantityException()
+        {
+        }
+        public NotEnoughProductQuantityException(String message)
+            : base(message)
+        { 
+        }
+    }
+}
diff --git a/5sim_api/Exceptions/NotEnoughRatingException.cs b/5sim_api/Exceptions/NotEnoughRatingException.cs
new file mode 100644
index 0000000..5aa7714
--- /dev/null
+++ b/5sim_api/Exceptions/NotEnoughRatingException.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Exceptions
+{
+    [Serializable]
+    class NotEnoughRatingException : Exception
+    {
+        public NotEnoughRatingException()
+        {
+        }
+        public NotEnoughRatingException(String message)
+            : base(message)
+        { 
+        }
+    }
+}
diff --git a/5sim_api/Exceptions/NotEnoughUserBalanceException.cs b/5sim_api/Exceptions/NotEnoughUserBalanceException.cs
new file mode 100644
index 0000000..357de19
--- /dev/null
+++ b/5sim_api/Exceptions/NotEnoughUserBalanceException.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Exceptions
+{
+    [Serializable]
+    class NotEnoughUserBalanceException : Exception
+    {
+        public NotEnoughUserBalanceException()
+        {
+        }
+        public NotEnoughUserBalanceException(String message)
+            : base(message)
+        { 
+        }
+    }
+}
diff --git a/5sim_api/Exceptions/OrderExpiredException.cs b/5sim_api/Exceptions/OrderExpiredException.cs
new file mode 100644
index 0000000..5d95a9f
--- /dev/null
+++ b/5sim_api/Exceptions/OrderExpiredException.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Exceptions
+{
+    [Serializable]
+    class OrderExpiredException : Exception
+    {
+        public OrderExpiredException()
+        {
+        }
+        public OrderExpiredException(String message)
+            : base(message)
+        { 
+        }
+    }
+}
diff --git a/5sim_api/Exceptions/OrderHasSmsException.cs b/5sim_api/Exceptions/OrderHasSmsException.cs
new file mode 100644
index 0000000..b4596da
--- /dev/null
+++ b/5sim_api/Exceptions/OrderHasSmsException.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Exceptions
+{
+    [Serializable]
+    class OrderHasSmsException : Exception
+    {
+        public OrderHasSmsException()
+        {
+        }
+        public OrderHasSmsException(String message)
+            : base(message)
+        { 
+        }
+    }
+}
diff --git a/5sim_api/Exceptions/OrderNotFoundException.cs b/5sim_api/Exceptions/OrderNotFoundException.cs
new file mode 100644
index 0000000..93bd838
--- /dev/null
+++ b/5sim_api/Exceptions/OrderNotFoundException.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Exceptions
+{
+    [Serializable]
+    class OrderNotFoundException : Exception
+    {
+        public OrderNotFoundException()
+        {
+        }
+        public OrderNotFoundException(String message)
+            : base(message)
+        { 
+        }
+    }
+}
diff --git a/5sim_api/Objects/Account.cs b/5sim_api/Objects/Account.cs
new file mode 100644
index 0000000..b75b611
--- /dev/null
+++ b/5sim_api/Objects/Account.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Objects
+{
+    public class Account
+    {
+        public int id;
+        public string email;
+        /// <summary>Funds in Rubel (RUB)</summary>
+        public float balance;
+        /// <summary>Total numbers of orders</summary>
+        public int rating;
+
+        public Account()
+        {
+        }
+    }
+}
diff --git a/5sim_api/Objects/Number.cs b/5sim_api/Objects/Number.cs
new file mode 100644
index 0000000..49ea46e
--- /dev/null
+++ b/5sim_api/Objects/Number.cs
@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Objects
+{
+    // Number from 5sim
+    public class Number
+    {
+        public int id;
+
+        /// <summary>The phone-number</summary>
+        public string number;
+        
+        /// <summary>The recieved sms (Activation only has 1 sms)</summary>
+        public List<Sms> sms;
+
+        public DateTime created_at;
+        public DateTime expires;
+
+        public bool forwarding;
+        public string forwarding_number;
+
+        public string product;
+        public float price;
+
+        public string carrier;
+        public string country;
+
+        public string status;
+
+        public Number()
+        {
+        }
+    }
+}
diff --git a/5sim_api/Objects/Service.cs b/5sim_api/Objects/Service.cs
new file mode 100644
index 0000000..d393aec
--- /dev/null
+++ b/5sim_api/Objects/Service.cs
@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Objects
+{
+    /// <summary>
+    /// Service from 5sim
+    /// </summary>
+    public class Service
+    {
+        public String name;
+        public String category;
+        public int quantity;
+        /// <summary>Price in Rubel (RUB)</summary>
+        public float price;
+
+        public Service()
+        {
+        }
+        public Service(String name, String category, int quantity, float price)
+        {
+            this.name = name;
+            this.category = category;
+            this.quantity = quantity;
+            this.price = price;
+        }
+    }
+}
diff --git a/5sim_api/Objects/Sms.cs b/5sim_api/Objects/Sms.cs
new file mode 100644
index 0000000..33bb72e
--- /dev/null
+++ b/5sim_api/Objects/Sms.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace YoutubeBot._5sim.Objects
+{
+    /// <summary>
+    /// SMS received by a 5sim number
+    /// </summary>
+    public class Sms
+    {
+        public int id;
+        public DateTime created_at;
+        public DateTime date;
+        public string sender;
+        public string text;
+        public string code;
+    }
+}