diff --git a/CHANGELOG.md b/CHANGELOG.md
index 61c300b..c1db315 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -42,6 +42,7 @@
 * Expose `UnsignedEvent` ([Yuki Kishimoto])
 * Expose `EventBuilder` ([Yuki Kishimoto])
 * Expose `Client::send_event_builder` ([Yuki Kishimoto])
+* Add `SendEventOutput` ([Yuki Kishimoto])
 
 ### Fixed
 
diff --git a/lib/nostr_sdk.dart b/lib/nostr_sdk.dart
index cf0d7fa..6a12380 100644
--- a/lib/nostr_sdk.dart
+++ b/lib/nostr_sdk.dart
@@ -13,3 +13,4 @@ export 'src/rust/api/protocol/signer.dart';
 export 'src/rust/api/relay/options.dart';
 export 'src/rust/api/client.dart';
 export 'src/rust/api/client/options.dart';
+export 'src/rust/api/client/output.dart';
diff --git a/lib/src/rust/api/client.dart b/lib/src/rust/api/client.dart
index 3b94491..cabff71 100644
--- a/lib/src/rust/api/client.dart
+++ b/lib/src/rust/api/client.dart
@@ -5,6 +5,7 @@
 
 import '../frb_generated.dart';
 import 'client/builder.dart';
+import 'client/output.dart';
 import 'package:flutter_rust_bridge/flutter_rust_bridge_for_generated.dart';
 import 'protocol/event.dart';
 import 'protocol/event/builder.dart';
@@ -37,12 +38,12 @@ abstract class Client implements RustOpaqueInterface {
   ///
   /// Send `Event` to all relays with `WRITE` flag.
   /// If `gossip` option is enabled, the event will be sent also to NIP65 relays (automatically discovered).
-  Future<String> sendEvent({required Event event});
+  Future<SendEventOutput> sendEvent({required Event event});
 
   /// Send event
   ///
   /// Take an [`EventBuilder`], sign it by using the [`NostrSigner`] and broadcast to relays (check [`Client::send_event`] from more details).
   ///
   /// Return an error if the [`NostrSigner`] is not set.
-  Future<String> sendEventBuilder({required EventBuilder builder});
+  Future<SendEventOutput> sendEventBuilder({required EventBuilder builder});
 }
diff --git a/lib/src/rust/api/client/output.dart b/lib/src/rust/api/client/output.dart
new file mode 100644
index 0000000..0ff47a4
--- /dev/null
+++ b/lib/src/rust/api/client/output.dart
@@ -0,0 +1,39 @@
+// This file is automatically generated, so please do not edit it.
+// Generated by `flutter_rust_bridge`@ 2.0.0.
+
+// ignore_for_file: invalid_use_of_internal_member, unused_import, unnecessary_import
+
+import '../../frb_generated.dart';
+import 'package:flutter_rust_bridge/flutter_rust_bridge_for_generated.dart';
+
+// These function are ignored because they are on traits that is not defined in current crate (put an empty `#[frb]` on it to unignore): `from`
+
+/// Output
+class SendEventOutput {
+  /// Event ID
+  final String id;
+
+  /// Set of relays that success
+  final Set<String> success;
+
+  /// Map of relays that failed, with related errors.
+  final Map<String, String> failed;
+
+  const SendEventOutput({
+    required this.id,
+    required this.success,
+    required this.failed,
+  });
+
+  @override
+  int get hashCode => id.hashCode ^ success.hashCode ^ failed.hashCode;
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is SendEventOutput &&
+          runtimeType == other.runtimeType &&
+          id == other.id &&
+          success == other.success &&
+          failed == other.failed;
+}
diff --git a/lib/src/rust/frb_generated.dart b/lib/src/rust/frb_generated.dart
index 478ba94..7c20eb5 100644
--- a/lib/src/rust/frb_generated.dart
+++ b/lib/src/rust/frb_generated.dart
@@ -6,6 +6,7 @@
 import 'api/client.dart';
 import 'api/client/builder.dart';
 import 'api/client/options.dart';
+import 'api/client/output.dart';
 import 'api/protocol/event.dart';
 import 'api/protocol/event/builder.dart';
 import 'api/protocol/event/tag.dart';
@@ -92,10 +93,10 @@ abstract class NostrSdkApi extends BaseApi {
 
   Client crateApiClientClientNew();
 
-  Future<String> crateApiClientClientSendEvent(
+  Future<SendEventOutput> crateApiClientClientSendEvent(
       {required Client that, required Event event});
 
-  Future<String> crateApiClientClientSendEventBuilder(
+  Future<SendEventOutput> crateApiClientClientSendEventBuilder(
       {required Client that, required EventBuilder builder});
 
   Client crateApiClientBuilderClientBuilderBuild({required ClientBuilder that});
@@ -539,7 +540,7 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
       );
 
   @override
-  Future<String> crateApiClientClientSendEvent(
+  Future<SendEventOutput> crateApiClientClientSendEvent(
       {required Client that, required Event event}) {
     return handler.executeNormal(NormalTask(
       callFfi: (port_) {
@@ -552,7 +553,7 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
             funcId: 6, port: port_);
       },
       codec: SseCodec(
-        decodeSuccessData: sse_decode_String,
+        decodeSuccessData: sse_decode_send_event_output,
         decodeErrorData: sse_decode_AnyhowException,
       ),
       constMeta: kCrateApiClientClientSendEventConstMeta,
@@ -568,7 +569,7 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
       );
 
   @override
-  Future<String> crateApiClientClientSendEventBuilder(
+  Future<SendEventOutput> crateApiClientClientSendEventBuilder(
       {required Client that, required EventBuilder builder}) {
     return handler.executeNormal(NormalTask(
       callFfi: (port_) {
@@ -581,7 +582,7 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
             funcId: 7, port: port_);
       },
       codec: SseCodec(
-        decodeSuccessData: sse_decode_String,
+        decodeSuccessData: sse_decode_send_event_output,
         decodeErrorData: sse_decode_AnyhowException,
       ),
       constMeta: kCrateApiClientClientSendEventBuilderConstMeta,
@@ -3053,6 +3054,13 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
     return UnsignedEventImpl.frbInternalDcoDecode(raw as List<dynamic>);
   }
 
+  @protected
+  Map<String, String> dco_decode_Map_String_String(dynamic raw) {
+    // Codec=Dco (DartCObject based), see doc to use other codecs
+    return Map.fromEntries(dco_decode_list_record_string_string(raw)
+        .map((e) => MapEntry(e.$1, e.$2)));
+  }
+
   @protected
   Client
       dco_decode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_Client(
@@ -3148,6 +3156,12 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
     return UnsignedEventImpl.frbInternalDcoDecode(raw as List<dynamic>);
   }
 
+  @protected
+  Set<String> dco_decode_Set_String(dynamic raw) {
+    // Codec=Dco (DartCObject based), see doc to use other codecs
+    return Set.from(dco_decode_list_String(raw));
+  }
+
   @protected
   String dco_decode_String(dynamic raw) {
     // Codec=Dco (DartCObject based), see doc to use other codecs
@@ -3226,12 +3240,44 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
     return raw as Uint8List;
   }
 
+  @protected
+  List<(String, String)> dco_decode_list_record_string_string(dynamic raw) {
+    // Codec=Dco (DartCObject based), see doc to use other codecs
+    return (raw as List<dynamic>).map(dco_decode_record_string_string).toList();
+  }
+
   @protected
   String? dco_decode_opt_String(dynamic raw) {
     // Codec=Dco (DartCObject based), see doc to use other codecs
     return raw == null ? null : dco_decode_String(raw);
   }
 
+  @protected
+  (String, String) dco_decode_record_string_string(dynamic raw) {
+    // Codec=Dco (DartCObject based), see doc to use other codecs
+    final arr = raw as List<dynamic>;
+    if (arr.length != 2) {
+      throw Exception('Expected 2 elements, got ${arr.length}');
+    }
+    return (
+      dco_decode_String(arr[0]),
+      dco_decode_String(arr[1]),
+    );
+  }
+
+  @protected
+  SendEventOutput dco_decode_send_event_output(dynamic raw) {
+    // Codec=Dco (DartCObject based), see doc to use other codecs
+    final arr = raw as List<dynamic>;
+    if (arr.length != 3)
+      throw Exception('unexpected arr length: expect 3 but see ${arr.length}');
+    return SendEventOutput(
+      id: dco_decode_String(arr[0]),
+      success: dco_decode_Set_String(arr[1]),
+      failed: dco_decode_Map_String_String(arr[2]),
+    );
+  }
+
   @protected
   SignerBackend dco_decode_signer_backend(dynamic raw) {
     // Codec=Dco (DartCObject based), see doc to use other codecs
@@ -3502,6 +3548,14 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
         sse_decode_usize(deserializer), sse_decode_i_32(deserializer));
   }
 
+  @protected
+  Map<String, String> sse_decode_Map_String_String(
+      SseDeserializer deserializer) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    var inner = sse_decode_list_record_string_string(deserializer);
+    return Map.fromEntries(inner.map((e) => MapEntry(e.$1, e.$2)));
+  }
+
   @protected
   Client
       sse_decode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_Client(
@@ -3609,6 +3663,13 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
         sse_decode_usize(deserializer), sse_decode_i_32(deserializer));
   }
 
+  @protected
+  Set<String> sse_decode_Set_String(SseDeserializer deserializer) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    var inner = sse_decode_list_String(deserializer);
+    return Set.from(inner);
+  }
+
   @protected
   String sse_decode_String(SseDeserializer deserializer) {
     // Codec=Sse (Serialization based), see doc to use other codecs
@@ -3703,6 +3764,19 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
     return deserializer.buffer.getUint8List(len_);
   }
 
+  @protected
+  List<(String, String)> sse_decode_list_record_string_string(
+      SseDeserializer deserializer) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+
+    var len_ = sse_decode_i_32(deserializer);
+    var ans_ = <(String, String)>[];
+    for (var idx_ = 0; idx_ < len_; ++idx_) {
+      ans_.add(sse_decode_record_string_string(deserializer));
+    }
+    return ans_;
+  }
+
   @protected
   String? sse_decode_opt_String(SseDeserializer deserializer) {
     // Codec=Sse (Serialization based), see doc to use other codecs
@@ -3714,6 +3788,25 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
     }
   }
 
+  @protected
+  (String, String) sse_decode_record_string_string(
+      SseDeserializer deserializer) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    var var_field0 = sse_decode_String(deserializer);
+    var var_field1 = sse_decode_String(deserializer);
+    return (var_field0, var_field1);
+  }
+
+  @protected
+  SendEventOutput sse_decode_send_event_output(SseDeserializer deserializer) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    var var_id = sse_decode_String(deserializer);
+    var var_success = sse_decode_Set_String(deserializer);
+    var var_failed = sse_decode_Map_String_String(deserializer);
+    return SendEventOutput(
+        id: var_id, success: var_success, failed: var_failed);
+  }
+
   @protected
   SignerBackend sse_decode_signer_backend(SseDeserializer deserializer) {
     // Codec=Sse (Serialization based), see doc to use other codecs
@@ -3995,6 +4088,14 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
         serializer);
   }
 
+  @protected
+  void sse_encode_Map_String_String(
+      Map<String, String> self, SseSerializer serializer) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    sse_encode_list_record_string_string(
+        self.entries.map((e) => (e.key, e.value)).toList(), serializer);
+  }
+
   @protected
   void
       sse_encode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_Client(
@@ -4107,6 +4208,12 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
         serializer);
   }
 
+  @protected
+  void sse_encode_Set_String(Set<String> self, SseSerializer serializer) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    sse_encode_list_String(self.toList(), serializer);
+  }
+
   @protected
   void sse_encode_String(String self, SseSerializer serializer) {
     // Codec=Sse (Serialization based), see doc to use other codecs
@@ -4195,6 +4302,16 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
     serializer.buffer.putUint8List(self);
   }
 
+  @protected
+  void sse_encode_list_record_string_string(
+      List<(String, String)> self, SseSerializer serializer) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    sse_encode_i_32(self.length, serializer);
+    for (final item in self) {
+      sse_encode_record_string_string(item, serializer);
+    }
+  }
+
   @protected
   void sse_encode_opt_String(String? self, SseSerializer serializer) {
     // Codec=Sse (Serialization based), see doc to use other codecs
@@ -4205,6 +4322,23 @@ class NostrSdkApiImpl extends NostrSdkApiImplPlatform implements NostrSdkApi {
     }
   }
 
+  @protected
+  void sse_encode_record_string_string(
+      (String, String) self, SseSerializer serializer) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    sse_encode_String(self.$1, serializer);
+    sse_encode_String(self.$2, serializer);
+  }
+
+  @protected
+  void sse_encode_send_event_output(
+      SendEventOutput self, SseSerializer serializer) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    sse_encode_String(self.id, serializer);
+    sse_encode_Set_String(self.success, serializer);
+    sse_encode_Map_String_String(self.failed, serializer);
+  }
+
   @protected
   void sse_encode_signer_backend(SignerBackend self, SseSerializer serializer) {
     // Codec=Sse (Serialization based), see doc to use other codecs
@@ -4327,15 +4461,16 @@ class ClientImpl extends RustOpaque implements Client {
   ///
   /// Send `Event` to all relays with `WRITE` flag.
   /// If `gossip` option is enabled, the event will be sent also to NIP65 relays (automatically discovered).
-  Future<String> sendEvent({required Event event}) => NostrSdk.instance.api
-      .crateApiClientClientSendEvent(that: this, event: event);
+  Future<SendEventOutput> sendEvent({required Event event}) =>
+      NostrSdk.instance.api
+          .crateApiClientClientSendEvent(that: this, event: event);
 
   /// Send event
   ///
   /// Take an [`EventBuilder`], sign it by using the [`NostrSigner`] and broadcast to relays (check [`Client::send_event`] from more details).
   ///
   /// Return an error if the [`NostrSigner`] is not set.
-  Future<String> sendEventBuilder({required EventBuilder builder}) =>
+  Future<SendEventOutput> sendEventBuilder({required EventBuilder builder}) =>
       NostrSdk.instance.api
           .crateApiClientClientSendEventBuilder(that: this, builder: builder);
 }
diff --git a/lib/src/rust/frb_generated.io.dart b/lib/src/rust/frb_generated.io.dart
index f2db071..a972da2 100644
--- a/lib/src/rust/frb_generated.io.dart
+++ b/lib/src/rust/frb_generated.io.dart
@@ -6,6 +6,7 @@
 import 'api/client.dart';
 import 'api/client/builder.dart';
 import 'api/client/options.dart';
+import 'api/client/output.dart';
 import 'api/protocol/event.dart';
 import 'api/protocol/event/builder.dart';
 import 'api/protocol/event/tag.dart';
@@ -191,6 +192,9 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       dco_decode_Auto_Ref_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           dynamic raw);
 
+  @protected
+  Map<String, String> dco_decode_Map_String_String(dynamic raw);
+
   @protected
   Client
       dco_decode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_Client(
@@ -250,6 +254,9 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       dco_decode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           dynamic raw);
 
+  @protected
+  Set<String> dco_decode_Set_String(dynamic raw);
+
   @protected
   String dco_decode_String(dynamic raw);
 
@@ -282,9 +289,18 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
   @protected
   Uint8List dco_decode_list_prim_u_8_strict(dynamic raw);
 
+  @protected
+  List<(String, String)> dco_decode_list_record_string_string(dynamic raw);
+
   @protected
   String? dco_decode_opt_String(dynamic raw);
 
+  @protected
+  (String, String) dco_decode_record_string_string(dynamic raw);
+
+  @protected
+  SendEventOutput dco_decode_send_event_output(dynamic raw);
+
   @protected
   SignerBackend dco_decode_signer_backend(dynamic raw);
 
@@ -424,6 +440,10 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       sse_decode_Auto_Ref_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           SseDeserializer deserializer);
 
+  @protected
+  Map<String, String> sse_decode_Map_String_String(
+      SseDeserializer deserializer);
+
   @protected
   Client
       sse_decode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_Client(
@@ -483,6 +503,9 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       sse_decode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           SseDeserializer deserializer);
 
+  @protected
+  Set<String> sse_decode_Set_String(SseDeserializer deserializer);
+
   @protected
   String sse_decode_String(SseDeserializer deserializer);
 
@@ -516,9 +539,20 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
   @protected
   Uint8List sse_decode_list_prim_u_8_strict(SseDeserializer deserializer);
 
+  @protected
+  List<(String, String)> sse_decode_list_record_string_string(
+      SseDeserializer deserializer);
+
   @protected
   String? sse_decode_opt_String(SseDeserializer deserializer);
 
+  @protected
+  (String, String) sse_decode_record_string_string(
+      SseDeserializer deserializer);
+
+  @protected
+  SendEventOutput sse_decode_send_event_output(SseDeserializer deserializer);
+
   @protected
   SignerBackend sse_decode_signer_backend(SseDeserializer deserializer);
 
@@ -661,6 +695,10 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       sse_encode_Auto_Ref_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           UnsignedEvent self, SseSerializer serializer);
 
+  @protected
+  void sse_encode_Map_String_String(
+      Map<String, String> self, SseSerializer serializer);
+
   @protected
   void
       sse_encode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_Client(
@@ -721,6 +759,9 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       sse_encode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           UnsignedEvent self, SseSerializer serializer);
 
+  @protected
+  void sse_encode_Set_String(Set<String> self, SseSerializer serializer);
+
   @protected
   void sse_encode_String(String self, SseSerializer serializer);
 
@@ -757,9 +798,21 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
   void sse_encode_list_prim_u_8_strict(
       Uint8List self, SseSerializer serializer);
 
+  @protected
+  void sse_encode_list_record_string_string(
+      List<(String, String)> self, SseSerializer serializer);
+
   @protected
   void sse_encode_opt_String(String? self, SseSerializer serializer);
 
+  @protected
+  void sse_encode_record_string_string(
+      (String, String) self, SseSerializer serializer);
+
+  @protected
+  void sse_encode_send_event_output(
+      SendEventOutput self, SseSerializer serializer);
+
   @protected
   void sse_encode_signer_backend(SignerBackend self, SseSerializer serializer);
 
diff --git a/lib/src/rust/frb_generated.web.dart b/lib/src/rust/frb_generated.web.dart
index 12e8d8a..ef49118 100644
--- a/lib/src/rust/frb_generated.web.dart
+++ b/lib/src/rust/frb_generated.web.dart
@@ -9,6 +9,7 @@
 import 'api/client.dart';
 import 'api/client/builder.dart';
 import 'api/client/options.dart';
+import 'api/client/output.dart';
 import 'api/protocol/event.dart';
 import 'api/protocol/event/builder.dart';
 import 'api/protocol/event/tag.dart';
@@ -193,6 +194,9 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       dco_decode_Auto_Ref_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           dynamic raw);
 
+  @protected
+  Map<String, String> dco_decode_Map_String_String(dynamic raw);
+
   @protected
   Client
       dco_decode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_Client(
@@ -252,6 +256,9 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       dco_decode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           dynamic raw);
 
+  @protected
+  Set<String> dco_decode_Set_String(dynamic raw);
+
   @protected
   String dco_decode_String(dynamic raw);
 
@@ -284,9 +291,18 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
   @protected
   Uint8List dco_decode_list_prim_u_8_strict(dynamic raw);
 
+  @protected
+  List<(String, String)> dco_decode_list_record_string_string(dynamic raw);
+
   @protected
   String? dco_decode_opt_String(dynamic raw);
 
+  @protected
+  (String, String) dco_decode_record_string_string(dynamic raw);
+
+  @protected
+  SendEventOutput dco_decode_send_event_output(dynamic raw);
+
   @protected
   SignerBackend dco_decode_signer_backend(dynamic raw);
 
@@ -426,6 +442,10 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       sse_decode_Auto_Ref_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           SseDeserializer deserializer);
 
+  @protected
+  Map<String, String> sse_decode_Map_String_String(
+      SseDeserializer deserializer);
+
   @protected
   Client
       sse_decode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_Client(
@@ -485,6 +505,9 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       sse_decode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           SseDeserializer deserializer);
 
+  @protected
+  Set<String> sse_decode_Set_String(SseDeserializer deserializer);
+
   @protected
   String sse_decode_String(SseDeserializer deserializer);
 
@@ -518,9 +541,20 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
   @protected
   Uint8List sse_decode_list_prim_u_8_strict(SseDeserializer deserializer);
 
+  @protected
+  List<(String, String)> sse_decode_list_record_string_string(
+      SseDeserializer deserializer);
+
   @protected
   String? sse_decode_opt_String(SseDeserializer deserializer);
 
+  @protected
+  (String, String) sse_decode_record_string_string(
+      SseDeserializer deserializer);
+
+  @protected
+  SendEventOutput sse_decode_send_event_output(SseDeserializer deserializer);
+
   @protected
   SignerBackend sse_decode_signer_backend(SseDeserializer deserializer);
 
@@ -663,6 +697,10 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       sse_encode_Auto_Ref_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           UnsignedEvent self, SseSerializer serializer);
 
+  @protected
+  void sse_encode_Map_String_String(
+      Map<String, String> self, SseSerializer serializer);
+
   @protected
   void
       sse_encode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_Client(
@@ -723,6 +761,9 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
       sse_encode_RustOpaque_flutter_rust_bridgefor_generatedRustAutoOpaqueInner_UnsignedEvent(
           UnsignedEvent self, SseSerializer serializer);
 
+  @protected
+  void sse_encode_Set_String(Set<String> self, SseSerializer serializer);
+
   @protected
   void sse_encode_String(String self, SseSerializer serializer);
 
@@ -759,9 +800,21 @@ abstract class NostrSdkApiImplPlatform extends BaseApiImpl<NostrSdkWire> {
   void sse_encode_list_prim_u_8_strict(
       Uint8List self, SseSerializer serializer);
 
+  @protected
+  void sse_encode_list_record_string_string(
+      List<(String, String)> self, SseSerializer serializer);
+
   @protected
   void sse_encode_opt_String(String? self, SseSerializer serializer);
 
+  @protected
+  void sse_encode_record_string_string(
+      (String, String) self, SseSerializer serializer);
+
+  @protected
+  void sse_encode_send_event_output(
+      SendEventOutput self, SseSerializer serializer);
+
   @protected
   void sse_encode_signer_backend(SignerBackend self, SseSerializer serializer);
 
diff --git a/rust/src/api/client/mod.rs b/rust/src/api/client/mod.rs
index 74f4c78..5dad6c1 100644
--- a/rust/src/api/client/mod.rs
+++ b/rust/src/api/client/mod.rs
@@ -8,8 +8,10 @@ use nostr_sdk::prelude::*;
 
 pub mod builder;
 pub mod options;
+pub mod output;
 
 use self::builder::_ClientBuilder;
+use self::output::SendEventOutput;
 use super::protocol::event::_Event;
 use super::protocol::event::builder::_EventBuilder;
 
@@ -60,9 +62,9 @@ impl _Client {
     ///
     /// Send `Event` to all relays with `WRITE` flag.
     /// If `gossip` option is enabled, the event will be sent also to NIP65 relays (automatically discovered).
-    pub async fn send_event(&self, event: _Event) -> Result<String> {
+    pub async fn send_event(&self, event: _Event) -> Result<SendEventOutput> {
         let output = self.inner.send_event(event.inner).await?;
-        Ok(output.id().to_string())
+        Ok(output.into())
     }
 
     /// Send event
@@ -70,8 +72,8 @@ impl _Client {
     /// Take an [`EventBuilder`], sign it by using the [`NostrSigner`] and broadcast to relays (check [`Client::send_event`] from more details).
     ///
     /// Return an error if the [`NostrSigner`] is not set.
-    pub async fn send_event_builder(&self, builder: _EventBuilder) -> Result<String> {
+    pub async fn send_event_builder(&self, builder: _EventBuilder) -> Result<SendEventOutput> {
         let output = self.inner.send_event_builder(builder.inner).await?;
-        Ok(output.id().to_string())
+        Ok(output.into())
     }
 }
diff --git a/rust/src/api/client/output.rs b/rust/src/api/client/output.rs
new file mode 100644
index 0000000..a0fff37
--- /dev/null
+++ b/rust/src/api/client/output.rs
@@ -0,0 +1,33 @@
+// Copyright (c) 2022-2023 Yuki Kishimoto
+// Copyright (c) 2023-2024 Rust Nostr Developers
+// Distributed under the MIT software license
+
+use std::collections::{HashMap, HashSet};
+
+use flutter_rust_bridge::frb;
+use nostr_sdk::prelude::*;
+
+/// Output
+#[frb]
+pub struct SendEventOutput {
+    /// Event ID
+    pub id: String,
+    /// Set of relays that success
+    pub success: HashSet<String>,
+    /// Map of relays that failed, with related errors.
+    pub failed: HashMap<String, String>,
+}
+
+impl From<Output<EventId>> for SendEventOutput {
+    fn from(output: Output<EventId>) -> Self {
+        Self {
+            id: output.id().to_string(),
+            success: output.success.into_iter().map(|u| u.to_string()).collect(),
+            failed: output
+                .failed
+                .into_iter()
+                .map(|(u, e)| (u.to_string(), e))
+                .collect(),
+        }
+    }
+}
diff --git a/rust/src/frb_generated.rs b/rust/src/frb_generated.rs
index 522c898..5a5dff2 100644
--- a/rust/src/frb_generated.rs
+++ b/rust/src/frb_generated.rs
@@ -4383,6 +4383,14 @@ impl SseDecode for _UnsignedEvent {
     }
 }
 
+impl SseDecode for std::collections::HashMap<String, String> {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    fn sse_decode(deserializer: &mut flutter_rust_bridge::for_generated::SseDeserializer) -> Self {
+        let mut inner = <Vec<(String, String)>>::sse_decode(deserializer);
+        return inner.into_iter().collect();
+    }
+}
+
 impl SseDecode for RustOpaqueMoi<flutter_rust_bridge::for_generated::RustAutoOpaqueInner<_Client>> {
     // Codec=Sse (Serialization based), see doc to use other codecs
     fn sse_decode(deserializer: &mut flutter_rust_bridge::for_generated::SseDeserializer) -> Self {
@@ -4495,6 +4503,14 @@ impl SseDecode
     }
 }
 
+impl SseDecode for std::collections::HashSet<String> {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    fn sse_decode(deserializer: &mut flutter_rust_bridge::for_generated::SseDeserializer) -> Self {
+        let mut inner = <Vec<String>>::sse_decode(deserializer);
+        return inner.into_iter().collect();
+    }
+}
+
 impl SseDecode for String {
     // Codec=Sse (Serialization based), see doc to use other codecs
     fn sse_decode(deserializer: &mut flutter_rust_bridge::for_generated::SseDeserializer) -> Self {
@@ -4590,6 +4606,18 @@ impl SseDecode for Vec<u8> {
     }
 }
 
+impl SseDecode for Vec<(String, String)> {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    fn sse_decode(deserializer: &mut flutter_rust_bridge::for_generated::SseDeserializer) -> Self {
+        let mut len_ = <i32>::sse_decode(deserializer);
+        let mut ans_ = vec![];
+        for idx_ in 0..len_ {
+            ans_.push(<(String, String)>::sse_decode(deserializer));
+        }
+        return ans_;
+    }
+}
+
 impl SseDecode for Option<String> {
     // Codec=Sse (Serialization based), see doc to use other codecs
     fn sse_decode(deserializer: &mut flutter_rust_bridge::for_generated::SseDeserializer) -> Self {
@@ -4601,6 +4629,29 @@ impl SseDecode for Option<String> {
     }
 }
 
+impl SseDecode for (String, String) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    fn sse_decode(deserializer: &mut flutter_rust_bridge::for_generated::SseDeserializer) -> Self {
+        let mut var_field0 = <String>::sse_decode(deserializer);
+        let mut var_field1 = <String>::sse_decode(deserializer);
+        return (var_field0, var_field1);
+    }
+}
+
+impl SseDecode for crate::api::client::output::SendEventOutput {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    fn sse_decode(deserializer: &mut flutter_rust_bridge::for_generated::SseDeserializer) -> Self {
+        let mut var_id = <String>::sse_decode(deserializer);
+        let mut var_success = <std::collections::HashSet<String>>::sse_decode(deserializer);
+        let mut var_failed = <std::collections::HashMap<String, String>>::sse_decode(deserializer);
+        return crate::api::client::output::SendEventOutput {
+            id: var_id,
+            success: var_success,
+            failed: var_failed,
+        };
+    }
+}
+
 impl SseDecode for crate::api::protocol::signer::SignerBackend {
     // Codec=Sse (Serialization based), see doc to use other codecs
     fn sse_decode(deserializer: &mut flutter_rust_bridge::for_generated::SseDeserializer) -> Self {
@@ -5218,6 +5269,28 @@ impl flutter_rust_bridge::IntoIntoDart<crate::api::client::options::ConnectionTa
     }
 }
 // Codec=Dco (DartCObject based), see doc to use other codecs
+impl flutter_rust_bridge::IntoDart for crate::api::client::output::SendEventOutput {
+    fn into_dart(self) -> flutter_rust_bridge::for_generated::DartAbi {
+        [
+            self.id.into_into_dart().into_dart(),
+            self.success.into_into_dart().into_dart(),
+            self.failed.into_into_dart().into_dart(),
+        ]
+        .into_dart()
+    }
+}
+impl flutter_rust_bridge::for_generated::IntoDartExceptPrimitive
+    for crate::api::client::output::SendEventOutput
+{
+}
+impl flutter_rust_bridge::IntoIntoDart<crate::api::client::output::SendEventOutput>
+    for crate::api::client::output::SendEventOutput
+{
+    fn into_into_dart(self) -> crate::api::client::output::SendEventOutput {
+        self
+    }
+}
+// Codec=Dco (DartCObject based), see doc to use other codecs
 impl flutter_rust_bridge::IntoDart for crate::api::protocol::signer::SignerBackend {
     fn into_dart(self) -> flutter_rust_bridge::for_generated::DartAbi {
         match self {
@@ -5346,6 +5419,13 @@ impl SseEncode for _UnsignedEvent {
     }
 }
 
+impl SseEncode for std::collections::HashMap<String, String> {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    fn sse_encode(self, serializer: &mut flutter_rust_bridge::for_generated::SseSerializer) {
+        <Vec<(String, String)>>::sse_encode(self.into_iter().collect(), serializer);
+    }
+}
+
 impl SseEncode for RustOpaqueMoi<flutter_rust_bridge::for_generated::RustAutoOpaqueInner<_Client>> {
     // Codec=Sse (Serialization based), see doc to use other codecs
     fn sse_encode(self, serializer: &mut flutter_rust_bridge::for_generated::SseSerializer) {
@@ -5470,6 +5550,13 @@ impl SseEncode
     }
 }
 
+impl SseEncode for std::collections::HashSet<String> {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    fn sse_encode(self, serializer: &mut flutter_rust_bridge::for_generated::SseSerializer) {
+        <Vec<String>>::sse_encode(self.into_iter().collect(), serializer);
+    }
+}
+
 impl SseEncode for String {
     // Codec=Sse (Serialization based), see doc to use other codecs
     fn sse_encode(self, serializer: &mut flutter_rust_bridge::for_generated::SseSerializer) {
@@ -5559,6 +5646,16 @@ impl SseEncode for Vec<u8> {
     }
 }
 
+impl SseEncode for Vec<(String, String)> {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    fn sse_encode(self, serializer: &mut flutter_rust_bridge::for_generated::SseSerializer) {
+        <i32>::sse_encode(self.len() as _, serializer);
+        for item in self {
+            <(String, String)>::sse_encode(item, serializer);
+        }
+    }
+}
+
 impl SseEncode for Option<String> {
     // Codec=Sse (Serialization based), see doc to use other codecs
     fn sse_encode(self, serializer: &mut flutter_rust_bridge::for_generated::SseSerializer) {
@@ -5569,6 +5666,23 @@ impl SseEncode for Option<String> {
     }
 }
 
+impl SseEncode for (String, String) {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    fn sse_encode(self, serializer: &mut flutter_rust_bridge::for_generated::SseSerializer) {
+        <String>::sse_encode(self.0, serializer);
+        <String>::sse_encode(self.1, serializer);
+    }
+}
+
+impl SseEncode for crate::api::client::output::SendEventOutput {
+    // Codec=Sse (Serialization based), see doc to use other codecs
+    fn sse_encode(self, serializer: &mut flutter_rust_bridge::for_generated::SseSerializer) {
+        <String>::sse_encode(self.id, serializer);
+        <std::collections::HashSet<String>>::sse_encode(self.success, serializer);
+        <std::collections::HashMap<String, String>>::sse_encode(self.failed, serializer);
+    }
+}
+
 impl SseEncode for crate::api::protocol::signer::SignerBackend {
     // Codec=Sse (Serialization based), see doc to use other codecs
     fn sse_encode(self, serializer: &mut flutter_rust_bridge::for_generated::SseSerializer) {