diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6a4c265f91..6493302ba7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@
 - expect a sdkName based on the test platform #105
 - Added Scope and Breadcrumb ring buffer #109
 - Added Hub to SDK #113
+- Ref: Hub passes the Scope to SentryClient
 - feat: sentry options #116
 
 # `package:sentry` changelog
diff --git a/dart/lib/src/client.dart b/dart/lib/src/client.dart
index b6bf185a81..6f19a952ed 100644
--- a/dart/lib/src/client.dart
+++ b/dart/lib/src/client.dart
@@ -197,12 +197,13 @@ abstract class SentryClient {
   }
 
   /// Reports the [throwable] and optionally its [stackTrace] to Sentry.io.
-  Future<SentryId> captureException(dynamic throwable, {dynamic stackTrace}) {
+  Future<SentryId> captureException(dynamic throwable,
+      {dynamic stackTrace, Scope scope}) {
     final event = Event(
       exception: throwable,
       stackTrace: stackTrace,
     );
-    return captureEvent(event);
+    return captureEvent(event, scope: scope);
   }
 
   /// Reports the [template]
@@ -211,12 +212,13 @@ abstract class SentryClient {
     SentryLevel level = SentryLevel.info,
     String template,
     List<dynamic> params,
+    Scope scope,
   }) {
     final event = Event(
       message: Message(formatted, template: template, params: params),
       level: level,
     );
-    return captureEvent(event);
+    return captureEvent(event, scope: scope);
   }
 
   Future<void> close() async {
diff --git a/dart/lib/src/hub.dart b/dart/lib/src/hub.dart
index c3e61aa394..30df85fc68 100644
--- a/dart/lib/src/hub.dart
+++ b/dart/lib/src/hub.dart
@@ -22,7 +22,10 @@ class Hub {
     );
   }
 
-  final ListQueue<_StackItem> _stack;
+  final ListQueue<_StackItem> _stack = ListQueue();
+
+  /// if stack is empty, it throws IterableElementError.noElement()
+  _StackItem _peek() => _stack.isNotEmpty ? _stack.first : null;
 
   final SentryOptions _options;
 
@@ -32,20 +35,18 @@ class Hub {
     return Hub._(options);
   }
 
-  Hub._(SentryOptions options)
-      : _options = options,
-        _stack = ListQueue() {
+  Hub._(SentryOptions options) : _options = options {
     _stack.add(_StackItem(_getClient(fromOptions: options), Scope(_options)));
     _isEnabled = true;
   }
 
   static void _validateOptions(SentryOptions options) {
     if (options == null) {
-      throw ArgumentError.notNull('options');
+      throw ArgumentError.notNull('SentryOptions is required.');
     }
 
-    if (options.dsn == null) {
-      throw ArgumentError.notNull('options.dsn');
+    if (options.dsn?.isNotEmpty != true) {
+      throw ArgumentError.notNull('DSN is required.');
     }
   }
 
@@ -54,7 +55,7 @@ class Hub {
   /// Check if the Hub is enabled/active.
   bool get isEnabled => _isEnabled;
 
-  SentryId _lastEventId;
+  SentryId _lastEventId = SentryId.empty();
 
   /// Last event id recorded in the current scope
   SentryId get lastEventId => _lastEventId;
@@ -74,7 +75,7 @@ class Hub {
         'captureEvent called with null parameter.',
       );
     } else {
-      final item = _stack.first;
+      final item = _peek();
       if (item != null) {
         try {
           sentryId = await item.client.captureEvent(event, scope: item.scope);
@@ -115,14 +116,11 @@ class Hub {
         'captureException called with null parameter.',
       );
     } else {
-      final item = _stack.first;
+      final item = _peek();
       if (item != null) {
         try {
-          // TODO pass the scope
-          sentryId = await item.client.captureException(
-            throwable,
-            stackTrace: stackTrace,
-          );
+          sentryId = await item.client.captureException(throwable,
+              stackTrace: stackTrace, scope: item.scope);
         } catch (err) {
           _options.logger(
             SentryLevel.error,
@@ -162,15 +160,15 @@ class Hub {
         'captureMessage called with null parameter.',
       );
     } else {
-      final item = _stack.first;
+      final item = _peek();
       if (item != null) {
         try {
-          // TODO pass the scope
           sentryId = await item.client.captureMessage(
             message,
             level: level,
             template: template,
             params: params,
+            scope: item.scope,
           );
         } catch (err) {
           _options.logger(
@@ -196,7 +194,7 @@ class Hub {
       _options.logger(SentryLevel.warning,
           "Instance is disabled and this 'bindClient' call is a no-op.");
     } else {
-      final item = _stack.first;
+      final item = _peek();
       if (item != null) {
         if (client != null) {
           _options.logger(SentryLevel.debug, 'New client bound to scope.');
@@ -234,7 +232,7 @@ class Hub {
         "Instance is disabled and this 'close' call is a no-op.",
       );
     } else {
-      final item = _stack.first;
+      final item = _peek();
       if (item != null) {
         try {
           item.client.close();
@@ -262,7 +260,7 @@ class Hub {
         "Instance is disabled and this 'configureScope' call is a no-op.",
       );
     } else {
-      final item = _stack.first;
+      final item = _peek();
       if (item != null) {
         try {
           callback(item.scope);
diff --git a/dart/lib/src/noop_client.dart b/dart/lib/src/noop_client.dart
index a7be5701a6..3f7f4c9119 100644
--- a/dart/lib/src/noop_client.dart
+++ b/dart/lib/src/noop_client.dart
@@ -4,8 +4,17 @@ import 'package:http/src/client.dart';
 
 import 'client.dart';
 import 'protocol.dart';
+import 'scope.dart';
 
 class NoOpSentryClient implements SentryClient {
+  NoOpSentryClient._();
+
+  static final NoOpSentryClient _instance = NoOpSentryClient._();
+
+  factory NoOpSentryClient() {
+    return _instance;
+  }
+
   @override
   User userContext;
 
@@ -24,7 +33,7 @@ class NoOpSentryClient implements SentryClient {
       Future.value(SentryId.empty());
 
   @override
-  Future<SentryId> captureException(throwable, {stackTrace}) =>
+  Future<SentryId> captureException(throwable, {stackTrace, scope}) =>
       Future.value(SentryId.empty());
 
   @override
@@ -33,6 +42,7 @@ class NoOpSentryClient implements SentryClient {
     SentryLevel level = SentryLevel.info,
     String template,
     List<dynamic> params,
+    Scope scope,
   }) =>
       Future.value(SentryId.empty());
 
diff --git a/dart/lib/src/protocol/sentry_id.dart b/dart/lib/src/protocol/sentry_id.dart
index bc66594404..e1e1abe75a 100644
--- a/dart/lib/src/protocol/sentry_id.dart
+++ b/dart/lib/src/protocol/sentry_id.dart
@@ -1,16 +1,16 @@
 /// Sentry response id
 
 class SentryId {
-  static const String emptyId = '00000000-0000-0000-0000-000000000000';
+  static const String _emptyId = '00000000-0000-0000-0000-000000000000';
 
   /// The ID Sentry.io assigned to the submitted event for future reference.
   final String _id;
 
-  String get id => _id;
+  // TODO: should we generate the new UUID here with an empty ctor?
 
   const SentryId(this._id);
 
-  factory SentryId.empty() => SentryId(emptyId);
+  factory SentryId.empty() => SentryId(_emptyId);
 
   @override
   String toString() => _id.replaceAll('-', '');
diff --git a/dart/lib/src/sentry.dart b/dart/lib/src/sentry.dart
index ffd94eace6..23a8ea6580 100644
--- a/dart/lib/src/sentry.dart
+++ b/dart/lib/src/sentry.dart
@@ -6,6 +6,7 @@ import 'client.dart';
 import 'hub.dart';
 import 'protocol.dart';
 import 'sentry_options.dart';
+import 'noop_hub.dart';
 
 /// Configuration options callback
 typedef OptionsConfiguration = void Function(SentryOptions);
@@ -13,20 +14,39 @@ typedef OptionsConfiguration = void Function(SentryOptions);
 /// Sentry SDK main entry point
 ///
 class Sentry {
-  static Hub _hub;
+  static Hub _hub = NoOpHub();
 
   Sentry._();
 
+  /// Returns the current hub
+  static Hub get currentHub => _hub;
+
+  /// Initializes the SDK
   static void init(OptionsConfiguration optionsConfiguration) {
     final options = SentryOptions();
     optionsConfiguration(options);
+    _init(options);
+  }
+
+  /// Initializes the SDK
+  static void _init(SentryOptions options) {
+    if (isEnabled) {
+      options.logger(
+        SentryLevel.warning,
+        'Sentry has been already initialized. Previous configuration will be overwritten.',
+      );
+    }
+
     _setDefaultConfiguration(options);
+
+    final hub = currentHub;
     _hub = Hub(options);
+    hub.close();
   }
 
   /// Reports an [event] to Sentry.io.
   static Future<SentryId> captureEvent(Event event) async {
-    return _hub.captureEvent(event);
+    return currentHub.captureEvent(event);
   }
 
   /// Reports the [exception] and optionally its [stackTrace] to Sentry.io.
@@ -34,11 +54,28 @@ class Sentry {
     dynamic error, {
     dynamic stackTrace,
   }) async {
-    return _hub.captureException(error, stackTrace: stackTrace);
+    return currentHub.captureException(error, stackTrace: stackTrace);
+  }
+
+  Future<SentryId> captureMessage(
+    String message, {
+    SentryLevel level,
+    String template,
+    List<dynamic> params,
+  }) async {
+    return currentHub.captureMessage(
+      message,
+      level: level,
+      template: template,
+      params: params,
+    );
   }
 
   /// Close the client SDK
-  static Future<void> close() async => _hub.close();
+  static Future<void> close() async => currentHub.close();
+
+  /// Check if the current Hub is enabled/active.
+  static bool get isEnabled => currentHub.isEnabled;
 
   static void _setDefaultConfiguration(SentryOptions options) {
     // TODO: check DSN nullability and empty
@@ -50,5 +87,5 @@ class Sentry {
 
   /// client injector only use for testing
   @visibleForTesting
-  static void initClient(SentryClient client) => _hub.bindClient(client);
+  static void initClient(SentryClient client) => currentHub.bindClient(client);
 }
diff --git a/dart/test/hub_test.dart b/dart/test/hub_test.dart
index 79dd59d69d..97cb566081 100644
--- a/dart/test/hub_test.dart
+++ b/dart/test/hub_test.dart
@@ -70,13 +70,18 @@ void main() {
     test('should capture exception', () {
       hub.captureException(fakeException);
 
-      verify(client.captureException(fakeException)).called(1);
+      verify(client.captureException(fakeException, scope: anyNamed('scope')))
+          .called(1);
     });
 
     test('should capture message', () {
       hub.captureMessage(fakeMessage.formatted, level: SentryLevel.info);
       verify(
-        client.captureMessage(fakeMessage.formatted, level: SentryLevel.info),
+        client.captureMessage(
+          fakeMessage.formatted,
+          level: SentryLevel.info,
+          scope: anyNamed('scope'),
+        ),
       ).called(1);
     });
   });
diff --git a/dart/test/sentry_test.dart b/dart/test/sentry_test.dart
index bd4154b538..6f4067a1eb 100644
--- a/dart/test/sentry_test.dart
+++ b/dart/test/sentry_test.dart
@@ -47,7 +47,11 @@ void main() {
     test('should capture the exception', () async {
       await Sentry.captureException(anException);
       verify(
-        client.captureException(anException, stackTrace: null),
+        client.captureException(
+          anException,
+          stackTrace: null,
+          scope: anyNamed('scope'),
+        ),
       ).called(1);
     });
   });
diff --git a/dart/test/stack_trace_test.dart b/dart/test/stack_trace_test.dart
index e3d80b9206..d0aa7b94ff 100644
--- a/dart/test/stack_trace_test.dart
+++ b/dart/test/stack_trace_test.dart
@@ -80,6 +80,7 @@ void main() {
     });
 
     test('allows changing the stack frame list before sending', () {
+      // ignore: omit_local_variable_types
       final StackFrameFilter filter =
           (list) => list.where((f) => f['abs_path'] != 'secret.dart').toList();
 
diff --git a/dart/test/test_utils.dart b/dart/test/test_utils.dart
index b5bc0d8a4e..5a34b86ee5 100644
--- a/dart/test/test_utils.dart
+++ b/dart/test/test_utils.dart
@@ -87,7 +87,7 @@ Future testCaptureException(
   } catch (error, stackTrace) {
     final sentryId =
         await client.captureException(error, stackTrace: stackTrace);
-    expect('${sentryId.id}', 'test-event-id');
+    expect('$sentryId', 'testeventid');
   }
 
   expect(postUri, client.postUri);
@@ -106,13 +106,12 @@ Future testCaptureException(
   } else {
     data = json.decode(utf8.decode(body)) as Map<String, dynamic>;
   }
-  final Map<String, dynamic> stacktrace =
-      data.remove('stacktrace') as Map<String, dynamic>;
+  final stacktrace = data.remove('stacktrace') as Map<String, dynamic>;
 
   expect(stacktrace['frames'], const TypeMatcher<List>());
   expect(stacktrace['frames'], isNotEmpty);
 
-  final Map<String, dynamic> topFrame =
+  final topFrame =
       (stacktrace['frames'] as Iterable<dynamic>).last as Map<String, dynamic>;
   expect(topFrame.keys, <String>[
     'abs_path',
@@ -222,7 +221,7 @@ void runTest({Codec<List<int>, List<int>> gzip, bool isWeb = false}) {
     final httpMock = MockClient((Request request) async {
       if (request.method == 'POST') {
         headers = request.headers;
-        return Response('{"id": "test-event-id"}', 200);
+        return Response('{"id": "testeventid"}', 200);
       }
       fail(
           'Unexpected request on ${request.method} ${request.url} in HttpMock');
@@ -246,7 +245,7 @@ void runTest({Codec<List<int>, List<int>> gzip, bool isWeb = false}) {
     } catch (error, stackTrace) {
       final sentryId =
           await client.captureException(error, stackTrace: stackTrace);
-      expect('${sentryId.id}', 'test-event-id');
+      expect('$sentryId', 'testeventid');
     }
 
     testHeaders(
@@ -302,7 +301,7 @@ void runTest({Codec<List<int>, List<int>> gzip, bool isWeb = false}) {
     } catch (error, stackTrace) {
       final sentryId =
           await client.captureException(error, stackTrace: stackTrace);
-      expect('${sentryId.id}', SentryId.emptyId);
+      expect('$sentryId', '00000000000000000000000000000000');
     }
 
     await client.close();