diff --git a/WavesSDK/Sources/Services/Data/Models/ResponseData.swift b/WavesSDK/Sources/Services/Data/Models/ResponseData.swift
index 0e952a0..2e3eb5e 100644
--- a/WavesSDK/Sources/Services/Data/Models/ResponseData.swift
+++ b/WavesSDK/Sources/Services/Data/Models/ResponseData.swift
@@ -11,7 +11,7 @@ import Foundation
 public extension DataService {
     struct Response<T: Decodable>: Decodable {
         public let type: String
-        public let data: T
+        public var data: T
         public let isLastPage: Bool?
         public let lastCursor: String?
 
@@ -25,7 +25,7 @@ public extension DataService {
     
     struct OptionalResponse<T: Decodable>: Decodable {
         public let type: String
-        public let data: T?
+        public var data: T?
         public let isLastPage: Bool?
         public let lastCursor: String?
         
diff --git a/WavesSDK/Sources/Services/Data/Queries/MassTransferDataQuery.swift b/WavesSDK/Sources/Services/Data/Queries/MassTransferDataQuery.swift
index 9935d78..f646164 100644
--- a/WavesSDK/Sources/Services/Data/Queries/MassTransferDataQuery.swift
+++ b/WavesSDK/Sources/Services/Data/Queries/MassTransferDataQuery.swift
@@ -37,7 +37,7 @@ extension DataService.Query {
         public let assetId: String?
         
         /// Курсор последней записи в списке (base64 строчка которая держит в себе инфу по оффсету, таймстампа и тд)
-        public let after: String?
+        public var after: String?
         
         /// признак сортировки
         public let sort: SortOrder