diff --git a/packages/gridproxy_client/lib/models/contracts.dart b/packages/gridproxy_client/lib/models/contracts.dart
index d19304a7..90174c4e 100644
--- a/packages/gridproxy_client/lib/models/contracts.dart
+++ b/packages/gridproxy_client/lib/models/contracts.dart
@@ -90,6 +90,7 @@ class ContractInfo {
   String state;
   int twin_id;
   String type;
+  int? nodeId;
 
   ContractInfo({
     required this.contract_id,
@@ -98,6 +99,7 @@ class ContractInfo {
     required this.state,
     required this.twin_id,
     required this.type,
+    this.nodeId,
   });
 
   factory ContractInfo.fromJson(Map<String, dynamic> json) {
@@ -122,6 +124,7 @@ class ContractInfo {
 
     return ContractInfo(
       contract_id: json['contract_id'] ?? 0,
+      nodeId: json['details']['nodeId'] ?? '',
       created_at: json['created_at'] ?? 0,
       details: details,
       state: json['state'] ?? '',
@@ -201,7 +204,7 @@ class ContractInfoQueryParams {
   int? node_id;
   String? name;
   ContractTypes? type;
-  ContractState? state;
+  List<ContractState>? state;
   String? deployment_data;
   String? deployment_hash;
   int? number_of_public_ips;
diff --git a/packages/gridproxy_client/lib/src/client.dart b/packages/gridproxy_client/lib/src/client.dart
index e148a197..6be3fd87 100644
--- a/packages/gridproxy_client/lib/src/client.dart
+++ b/packages/gridproxy_client/lib/src/client.dart
@@ -19,29 +19,36 @@ class GridProxyClient {
   Future<dynamic> getRequest(
       String path, Map<String, dynamic>? queryParameters) async {
     try {
-      final convertedQueryParameters = queryParameters
-          ?.map((key, value) => MapEntry(key, value?.toString() ?? ''));
+      final Map<String, String> encodedQueryParams = {};
+      queryParameters?.forEach((key, value) {
+        if (value is List) {
+          encodedQueryParams[key] = value.map((e) => e.toString()).join(',');
+        } else if (value != null) {
+          encodedQueryParams[key] = value.toString();
+        }
+      });
 
       final uri = Uri.parse(baseUrl);
       final scheme = uri.scheme;
       final host = uri.host;
 
-      final requestUri = convertedQueryParameters != null &&
-              convertedQueryParameters.isNotEmpty
+      final requestUri = encodedQueryParams.isNotEmpty
           ? (scheme == 'https'
-              ? Uri.https(host, path, convertedQueryParameters)
-              : Uri.http(host, path, convertedQueryParameters))
+              ? Uri.https(host, path, encodedQueryParams)
+              : Uri.http(host, path, encodedQueryParams))
           : (scheme == 'https' ? Uri.https(host, path) : Uri.http(host, path));
+
       final response = await http.get(requestUri);
 
       if (response.statusCode == 200) {
         final jsonData = json.decode(response.body);
         return jsonData;
       } else {
-        throw Exception('Failed to load data got: ${response.body}');
+        throw Exception(
+            'Failed to load data. Status: ${response.statusCode}, Body: ${response.body}');
       }
     } catch (e) {
-      throw Exception('Error: $e');
+      throw Exception('Error during GET request to $path: $e');
     }
   }
 }