diff --git a/SharpPusher/Services/Api.cs b/SharpPusher/Services/Api.cs
deleted file mode 100644
index c22aca0..0000000
--- a/SharpPusher/Services/Api.cs
+++ /dev/null
@@ -1,66 +0,0 @@
-// SharpPusher
-// Copyright (c) 2017 Coding Enthusiast
-// Distributed under the MIT software license, see the accompanying
-// file LICENCE or http://www.opensource.org/licenses/mit-license.php.
-
-using Newtonsoft.Json.Linq;
-using SharpPusher.Models;
-using System;
-using System.Net.Http;
-using System.Threading.Tasks;
-
-namespace SharpPusher.Services
-{
-    public abstract class Api
-    {
-        /// <summary>
-        /// Name of the Api service. Used for showing the name in GUI.
-        /// </summary>
-        public abstract string ApiName { get; }
-
-
-        /// <summary>
-        /// Broadcasts a signed raw transactions in hex format.
-        /// </summary>
-        /// <param name="txHex">Signed raw transaction in hex format</param>
-        /// <returns>Result of broadcasting.</returns>
-        public abstract Task<Response> PushTx(string txHex);
-
-
-        /// <summary>
-        /// Broadcasts a signed raw transactions in hex format.
-        /// </summary>
-        /// <param name="txHex">Signed raw transaction in hex format</param>
-        /// <param name="jKey">The JSON key used for making the HttpContent in JSON format.</param>
-        /// <param name="url">Api url to use.</param>
-        /// <returns>Result of broadcasting.</returns>
-        protected static async Task<Response> PushTx(string txHex, string jKey, string url)
-        {
-            Response resp = new();
-
-            using HttpClient client = new();
-            try
-            {
-                JObject tx = new()
-                {
-                    {jKey, txHex}
-                };
-
-                HttpResponseMessage httpResp = await client.PostAsync(url, new StringContent(tx.ToString()));
-                if (!httpResp.IsSuccessStatusCode)
-                {
-                    resp.SetError("API response doesn't indicate success.");
-                }
-                resp.SetMessage(await httpResp.Content.ReadAsStringAsync());
-            }
-            catch (Exception ex)
-            {
-                string errMsg = (ex.InnerException == null) ? ex.Message : ex.Message + " " + ex.InnerException;
-                resp.SetError(errMsg);
-            }
-
-            return resp;
-        }
-
-    }
-}
diff --git a/SharpPusher/Services/IApi.cs b/SharpPusher/Services/IApi.cs
new file mode 100644
index 0000000..4f11756
--- /dev/null
+++ b/SharpPusher/Services/IApi.cs
@@ -0,0 +1,16 @@
+// SharpPusher
+// Copyright (c) 2017 Coding Enthusiast
+// Distributed under the MIT software license, see the accompanying
+// file LICENCE or http://www.opensource.org/licenses/mit-license.php.
+
+using SharpPusher.Models;
+using System.Threading.Tasks;
+
+namespace SharpPusher.Services
+{
+    public interface IApi
+    {
+        string ApiName { get; }
+        Task<Response> PushTx(string txHex);
+    }
+}
diff --git a/SharpPusher/Services/P2P.cs b/SharpPusher/Services/P2P.cs
index e1b25a8..9dd465e 100644
--- a/SharpPusher/Services/P2P.cs
+++ b/SharpPusher/Services/P2P.cs
@@ -13,7 +13,7 @@
 
 namespace SharpPusher.Services
 {
-    public class P2P : Api
+    public class P2P : IApi
     {
         public P2P(bool isMainNet)
         {
@@ -45,9 +45,9 @@ public P2P(bool isMainNet)
         };
 
 
-        public override string ApiName => "P2P";
+        public string ApiName => "P2P";
 
-        public override async Task<Response> PushTx(string txHex)
+        public async Task<Response> PushTx(string txHex)
         {
             Response resp = new();
 
diff --git a/SharpPusher/Services/PushServices/BlockCypher.cs b/SharpPusher/Services/PushServices/BlockCypher.cs
index 8fe66c1..c714850 100644
--- a/SharpPusher/Services/PushServices/BlockCypher.cs
+++ b/SharpPusher/Services/PushServices/BlockCypher.cs
@@ -5,31 +5,52 @@
 
 using Newtonsoft.Json.Linq;
 using SharpPusher.Models;
+using System.Net.Http;
+using System;
 using System.Threading.Tasks;
 
 namespace SharpPusher.Services.PushServices
 {
-    public sealed class BlockCypher : Api
+    public sealed class BlockCypher : IApi
     {
-        public override string ApiName => "BlockCypher";
+        public string ApiName => "BlockCypher";
 
 
-        public override async Task<Response> PushTx(string txHex)
+        public async Task<Response> PushTx(string txHex)
         {
-            Response resp = await PushTx(txHex, "tx", "https://api.blockcypher.com/v1/bcy/test/txs/push");
-            if (!resp.IsSuccess)
-            {
-                return resp;
-            }
+            Response resp = new();
+            using HttpClient client = new();
 
-            JObject jResult = JObject.Parse(resp.Message);
-            if (jResult["error"] != null)
+            try
             {
-                resp.SetError(jResult["error"].ToString());
+                JObject tx = new()
+                {
+                    {"tx", txHex}
+                };
+
+                string url = "https://api.blockcypher.com/v1/bcy/test/txs/push";
+                HttpResponseMessage httpResp = await client.PostAsync(url, new StringContent(tx.ToString()));
+                if (!httpResp.IsSuccessStatusCode)
+                {
+                    resp.SetError("API response doesn't indicate success.");
+                    return resp;
+                }
+
+                string t = await httpResp.Content.ReadAsStringAsync();
+                JObject jResult = JObject.Parse(t);
+                if (jResult["error"] != null)
+                {
+                    resp.SetError(jResult["error"]?.ToString() ?? "");
+                }
+                else
+                {
+                    resp.SetMessage($"Successfully done. Tx ID: {jResult["hash"]}");
+                }
             }
-            else
+            catch (Exception ex)
             {
-                resp.SetMessage($"Successfully done. Tx ID: {jResult["hash"]}");
+                string errMsg = (ex.InnerException == null) ? ex.Message : ex.Message + " " + ex.InnerException;
+                resp.SetError(errMsg);
             }
 
             return resp;
diff --git a/SharpPusher/Services/PushServices/BlockchainInfo.cs b/SharpPusher/Services/PushServices/BlockchainInfo.cs
index 73ac71c..35bf797 100644
--- a/SharpPusher/Services/PushServices/BlockchainInfo.cs
+++ b/SharpPusher/Services/PushServices/BlockchainInfo.cs
@@ -13,11 +13,11 @@
 
 namespace SharpPusher.Services.PushServices
 {
-    public sealed class BlockchainInfo : Api
+    public sealed class BlockchainInfo : IApi
     {
-        public override string ApiName => "Blockchain.Info";
+        public string ApiName => "Blockchain.Info";
 
-        public async override Task<Response> PushTx(string txHex)
+        public async Task<Response> PushTx(string txHex)
         {
             using HttpClient client = new();
             Response resp = new();
@@ -40,11 +40,11 @@ public async override Task<Response> PushTx(string txHex)
                     if (sResult != null && sResult.StartsWith("{\"error\":"))
                     {
                         JObject jObject = JObject.Parse(sResult);
-                        resp.SetError(jObject["error"].ToString());
+                        resp.SetError(jObject["error"]?.ToString() ?? "");
                     }
                     else
                     {
-                        resp.SetMessage(sResult);
+                        resp.SetMessage(sResult ?? "");
                     }
                 }
                 else
diff --git a/SharpPusher/Services/PushServices/Blockchair.cs b/SharpPusher/Services/PushServices/Blockchair.cs
index 4e22475..ec22410 100644
--- a/SharpPusher/Services/PushServices/Blockchair.cs
+++ b/SharpPusher/Services/PushServices/Blockchair.cs
@@ -13,7 +13,7 @@
 
 namespace SharpPusher.Services.PushServices
 {
-    public sealed class Blockchair : Api
+    public sealed class Blockchair : IApi
     {
         public Blockchair(Chain chain)
         {
@@ -45,9 +45,9 @@ public enum Chain
 
         private readonly Chain chain;
 
-        public override string ApiName => "Blockchair";
+        public string ApiName => "Blockchair";
 
-        public override async Task<Response> PushTx(string txHex)
+        public async Task<Response> PushTx(string txHex)
         {
             using HttpClient client = new();
             Response resp = new();
@@ -83,7 +83,7 @@ public override async Task<Response> PushTx(string txHex)
 
                 var content = new FormUrlEncodedContent(
                 [
-                        new KeyValuePair<string, string>("data", txHex)
+                    new KeyValuePair<string, string>("data", txHex)
                 ]);
 
                 HttpResponseMessage httpResp = await client.PostAsync(url, content);
diff --git a/SharpPusher/ViewModels/MainWindowViewModel.cs b/SharpPusher/ViewModels/MainWindowViewModel.cs
index b0ed8a7..7d9ebec 100644
--- a/SharpPusher/ViewModels/MainWindowViewModel.cs
+++ b/SharpPusher/ViewModels/MainWindowViewModel.cs
@@ -189,16 +189,16 @@ private void SetApiList()
         }
 
 
-        private ObservableCollection<Api> _apiList = new();
-        public ObservableCollection<Api> ApiList
+        private ObservableCollection<IApi> _apiList = new();
+        public ObservableCollection<IApi> ApiList
         {
             get => _apiList;
             set => SetField(ref _apiList, value);
         }
 
 
-        private Api _selApi;
-        public Api SelectedApi
+        private IApi _selApi;
+        public IApi SelectedApi
         {
             get => _selApi;
             set