diff --git a/yandexmarket/products.proto b/yandexmarket/products.proto
index 4ebaa2d..979774d 100644
--- a/yandexmarket/products.proto
+++ b/yandexmarket/products.proto
@@ -3,4 +3,61 @@ package yandexmarket.products;
 option go_package = "./yandexmarket/products";
 
 service ProductsService {
+  rpc CalculateProductTariffs(CalculateProductTariffsRequest) returns (stream CalculateProductTariffsResponse);
+}
+
+message CalculateProductTariffsRequest {
+
+  message Offers {
+    int64 category_id = 1;
+    int64 price = 2;
+    int64 length = 3;
+    int64 width = 4;
+    int64 height = 5;
+    int64 weight = 6;
+    int64 quantity = 7;
+  }
+
+  message Parameters {
+    int64 campaign_id = 1;
+    string selling_program = 2;
+    string frequency = 3;
+    string currency = 4;
+  }
+
+  int64 marketplace_id = 1;
+  repeated Offers offers = 2;
+}
+
+message CalculateProductTariffsResponse {
+
+  message Offer {
+    int64 category_id = 1;
+    int64 price = 2;
+    int64 length = 3;
+    int64 width = 4;
+    int64 height = 5;
+    int64 weight = 6;
+    int64 quantity = 7;
+  }
+
+  message Parameters {
+    string name = 1;
+    string value = 2;
+  }
+
+  message Tariffs {
+    string type = 1;
+    int64 amount = 2;
+    string currency = 3;
+    repeated Parameters parameters = 4;
+  }
+
+  message Offers {
+    Offer offer = 1;
+    repeated Tariffs tariffs = 2;
+  }
+
+  repeated Offers offers = 1;
+
 }
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