diff --git a/lib/src/http_client/models/submit_close_request.dart b/lib/src/http_client/models/submit_close_request.dart
new file mode 100644
index 0000000..9131764
--- /dev/null
+++ b/lib/src/http_client/models/submit_close_request.dart
@@ -0,0 +1,15 @@
+import 'package:tbdex/src/protocol/models/close.dart';
+
+class SubmitCloseRequest {
+  final Close close;
+
+  SubmitCloseRequest({
+    required this.close,
+  });
+
+  Map<String, dynamic> toJson() {
+    return {
+      'message': close.toJson(),
+    };
+  }
+}
diff --git a/lib/src/http_client/models/submit_order_request.dart b/lib/src/http_client/models/submit_order_request.dart
new file mode 100644
index 0000000..62410c1
--- /dev/null
+++ b/lib/src/http_client/models/submit_order_request.dart
@@ -0,0 +1,15 @@
+import 'package:tbdex/src/protocol/models/order.dart';
+
+class SubmitOrderRequest {
+  final Order order;
+
+  SubmitOrderRequest({
+    required this.order,
+  });
+
+  Map<String, dynamic> toJson() {
+    return {
+      'message': order.toJson(),
+    };
+  }
+}
diff --git a/lib/src/http_client/tbdex_http_client.dart b/lib/src/http_client/tbdex_http_client.dart
index 825fab6..649a223 100644
--- a/lib/src/http_client/tbdex_http_client.dart
+++ b/lib/src/http_client/tbdex_http_client.dart
@@ -4,6 +4,8 @@ import 'package:http/http.dart' as http;
 import 'package:tbdex/src/http_client/models/create_exchange_request.dart';
 import 'package:tbdex/src/http_client/models/exchange.dart';
 import 'package:tbdex/src/http_client/models/get_offerings_filter.dart';
+import 'package:tbdex/src/http_client/models/submit_close_request.dart';
+import 'package:tbdex/src/http_client/models/submit_order_request.dart';
 import 'package:tbdex/src/protocol/models/close.dart';
 import 'package:tbdex/src/protocol/models/offering.dart';
 import 'package:tbdex/src/protocol/models/order.dart';
@@ -102,9 +104,7 @@ class TbdexHttpClient {
   }) async {
     Validator.validateMessage(rfq);
     final pfiDid = rfq.metadata.to;
-    final body = jsonEncode(
-      CreateExchangeRequest(rfq: rfq, replyTo: replyTo),
-    );
+    final body = jsonEncode(CreateExchangeRequest(rfq: rfq, replyTo: replyTo));
 
     return _submitMessage(pfiDid, body);
   }
@@ -113,7 +113,7 @@ class TbdexHttpClient {
     Validator.validateMessage(order);
     final pfiDid = order.metadata.to;
     final exchangeId = order.metadata.exchangeId;
-    final body = jsonEncode(order.toJson());
+    final body = jsonEncode(SubmitOrderRequest(order: order));
 
     return _submitMessage(pfiDid, body, exchangeId: exchangeId);
   }
@@ -122,7 +122,7 @@ class TbdexHttpClient {
     Validator.validateMessage(close);
     final pfiDid = close.metadata.to;
     final exchangeId = close.metadata.exchangeId;
-    final body = jsonEncode(close.toJson());
+    final body = jsonEncode(SubmitCloseRequest(close: close));
 
     return _submitMessage(pfiDid, body, exchangeId: exchangeId);
   }
diff --git a/test/helpers/test_data.dart b/test/helpers/test_data.dart
index 2c6f2a4..b537572 100644
--- a/test/helpers/test_data.dart
+++ b/test/helpers/test_data.dart
@@ -2,6 +2,8 @@ import 'dart:convert';
 
 import 'package:json_schema/json_schema.dart';
 import 'package:tbdex/src/http_client/models/create_exchange_request.dart';
+import 'package:tbdex/src/http_client/models/submit_close_request.dart';
+import 'package:tbdex/src/http_client/models/submit_order_request.dart';
 import 'package:tbdex/src/protocol/models/close.dart';
 import 'package:tbdex/src/protocol/models/message.dart';
 import 'package:tbdex/src/protocol/models/message_data.dart';
@@ -185,10 +187,10 @@ class TestData {
       jsonEncode(CreateExchangeRequest(rfq: rfq, replyTo: replyTo));
 
   static String getSubmitOrderRequest(Order order) =>
-      jsonEncode(order.toJson());
+      jsonEncode(SubmitOrderRequest(order: order));
 
   static String getSubmitCloseRequest(Close close) =>
-      jsonEncode(close.toJson());
+      jsonEncode(SubmitCloseRequest(close: close));
 
   static JsonSchema requiredPaymentDetailsSchema() {
     return JsonSchema.create(
diff --git a/test/http_client/tbdex_http_client_test.dart b/test/http_client/tbdex_http_client_test.dart
index 631a56e..520c8f4 100644
--- a/test/http_client/tbdex_http_client_test.dart
+++ b/test/http_client/tbdex_http_client_test.dart
@@ -13,7 +13,7 @@ void main() async {
   const pfiServiceEndpoint = 'http://localhost:8892/ingress/pfi';
 
   const didDoc =
-      '''{"id":"did:web:localhost%3A8892:ingress","verificationMethod":[{"id":"#0","type":"JsonWebKey","controller":"did:web:localhost%3A8892:ingress","publicKeyJwk":{"kty":"OKP","crv":"Ed25519","x":"oQ6Nl6pZjDa0I2MIsPV7q7aXX7moneoIC0XprR6ull8"}}],"service":[{"id":"#pfi","type":"PFI","serviceEndpoint":["localhost:8892/ingress/pfi"]}]}''';
+      '''{"id":"did:web:localhost%3A8892:ingress","verificationMethod":[{"id":"#0","type":"JsonWebKey","controller":"did:web:localhost%3A8892:ingress","publicKeyJwk":{"kty":"OKP","crv":"Ed25519","x":"oQ6Nl6pZjDa0I2MIsPV7q7aXX7moneoIC0XprR6ull8"}}],"service":[{"id":"#pfi","type":"PFI","serviceEndpoint":["http://localhost:8892/ingress/pfi"]}]}''';
 
   late MockHttpClient mockHttpClient;