diff --git a/lib/src/MethodNames.dart b/lib/src/MethodNames.dart
index ab6bf19..7acb513 100644
--- a/lib/src/MethodNames.dart
+++ b/lib/src/MethodNames.dart
@@ -14,5 +14,4 @@ class PlatformMethodNames {
 
   static const getSessionMessageNamespaces = "CastSession.getSessionMessageNamespaces";
   static const onMessageReceived = "CastSession.onMessageReceived";
-  static const sendMessage = "CastSession.sendMessage";
 }
\ No newline at end of file
diff --git a/lib/src/cast/CastContext.dart b/lib/src/cast/CastContext.dart
index 8d1abbb..fecd09a 100644
--- a/lib/src/cast/CastContext.dart
+++ b/lib/src/cast/CastContext.dart
@@ -1,13 +1,15 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
+import '../HostApis.dart';
 import '../MethodNames.dart';
 import 'SessionManager.dart';
 
 class CastContext {
   final ValueNotifier<CastState> state = ValueNotifier(CastState.unavailable);
   final MethodChannel _channel;
+  final CastApi castApi;
 
-  CastContext(this._channel);
+  CastContext(this._channel, this.castApi);
 
   void showCastChooserDialog() {
     _channel.invokeMethod(PlatformMethodNames.showCastDialog);
@@ -22,7 +24,7 @@ class CastContext {
   SessionManager get sessionManager {
     var result = _sessionManager;
     if (result == null) {
-      _sessionManager = result = SessionManager(_channel);
+      _sessionManager = result = SessionManager(castApi);
     }
     return result;
   }
diff --git a/lib/src/cast/SessionManager.dart b/lib/src/cast/SessionManager.dart
index 140f9e7..32cc0b4 100644
--- a/lib/src/cast/SessionManager.dart
+++ b/lib/src/cast/SessionManager.dart
@@ -1,11 +1,12 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
+import '../HostApis.dart';
 import '../MethodNames.dart';
 
 class SessionManager {
-  final MethodChannel _channel;
+  final CastApi castApi;
 
-  SessionManager(this._channel);
+  SessionManager(this.castApi);
 
   final ValueNotifier<SessionState> state = ValueNotifier(SessionState.idle);
 
@@ -54,8 +55,10 @@ class SessionManager {
   }
 
   void sendMessage(String namespace, String message) {
-    final argsMap = {'namespace': namespace, 'message': message};
-    _channel.invokeMethod(PlatformMethodNames.sendMessage, argsMap);
+    final castMessage = CastMessage();
+    castMessage.namespace = namespace;
+    castMessage.message = message;
+    castApi.sendMessage(castMessage);
   }
 }
 
diff --git a/lib/src/flutter_cast_framework.dart b/lib/src/flutter_cast_framework.dart
index 9ce0cc2..b2270de 100644
--- a/lib/src/flutter_cast_framework.dart
+++ b/lib/src/flutter_cast_framework.dart
@@ -1,12 +1,14 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 
+import 'HostApis.dart';
 import 'MethodNames.dart';
 import 'cast/CastContext.dart';
 
 class FlutterCastFramework {
   static const MethodChannel _channel =
       const MethodChannel('flutter_cast_framework');
+  static final castApi = CastApi();
 
   /// List of namespaces to listen for custom messages
   static List<String> namespaces = [];
@@ -58,7 +60,7 @@ class FlutterCastFramework {
   static CastContext get castContext {
     var castContext = _castContext;
     if (!_isInitiated || castContext == null) {
-      _castContext = castContext = CastContext(_channel);
+      _castContext = castContext = CastContext(_channel, castApi);
       // TODO: find a better way to init the plugin
       _isInitiated = true;
       _init();