diff --git a/src/trs/trs.hpp b/src/trs/trs.hpp
index eadef58..f3686df 100644
--- a/src/trs/trs.hpp
+++ b/src/trs/trs.hpp
@@ -73,17 +73,24 @@ namespace trs
         }
       }
 
+      void set_api_url(std::string url)
+      {
+        API_URL = url;
+      }
+
     private:
       std::string m_service_name;
       bool m_log_to_console { true };
       function_manager<transaction> m_function_manager;
       inspector<transaction> m_inspector;
+      std::string API_URL { "/" };
+
 
     private:
       void set_CORS()
       {
         Options(R"(\*)", [](const auto& req, auto& res) { res.set_header("Allow", "POST, HEAD, OPTIONS"); });
-        Options(var::API_URL, [](const auto& req, auto& res)
+        Options(API_URL, [](const auto& req, auto& res)
         {
           res.set_header("Access-Control-Allow-Origin", "*");
           res.set_header("Allow", "POST, HEAD, OPTIONS");
@@ -94,7 +101,7 @@ namespace trs
       
       void set_post()
       {
-        Post(var::API_URL, [&](const httplib::Request& req, httplib::Response& res) {
+        Post(API_URL, [&](const httplib::Request& req, httplib::Response& res) {
           res.set_header("Access-Control-Allow-Origin", "*");
           res.set_header("Access-Control-Allow-Headers", "*");
           res.set_header("Access-Control-Allow-Methods", "POST");
diff --git a/src/trs/utils/var.hpp b/src/trs/utils/var.hpp
index d01c16a..0dbe388 100644
--- a/src/trs/utils/var.hpp
+++ b/src/trs/utils/var.hpp
@@ -6,7 +6,6 @@ namespace trs::var
 {
   inline const int PORT = 5000;
   inline const std::string HOST = "0.0.0.0";
-  inline const std::string API_URL = "/";
 
   inline const std::string ALIEN_SYSTEM_ERROR = "is alien system error it can be very dangerous!!! good luck my friend!";
   inline const std::string NO_VALID_DATA = "no valid data";