diff --git a/examples/cpp/cxx_test.cc b/examples/cpp/cxx_test.cc
index e26c8f0..5e1f4ff 100644
--- a/examples/cpp/cxx_test.cc
+++ b/examples/cpp/cxx_test.cc
@@ -36,6 +36,23 @@ int main()
               << "returned: "
               << hp->get("x.y.z", "false") << std::endl;
 
+    // ======= opt api test =======
+
+    PUTPARAM(xacc.eager, false);
+    PUTPARAM(xacc.lazy.device, "xla");
+
+    std::string device_type = GETPARAM(xacc.lazy.device, "xpu");
+    std::cout << "\n:: (opt api) test put parameter" << std::endl
+              << "expected: xla" << std::endl
+              << "returned: " << device_type << std::endl
+              << "expected: 0" << std::endl
+              << "returned: " << GETPARAM(xacc.eager, true) << std::endl;
+
+    std::cout << "\n:: (opt api) test undefined" << std::endl
+              << "expected: 100" << std::endl
+              << "returned: " << GETPARAM(xacc.dynamo.time, 100) << std::endl;
+
     std::cout << "in main" << std::endl;
+
     return 0;
 }
\ No newline at end of file
diff --git a/hyperparameter/hyperparameter.h b/hyperparameter/hyperparameter.h
index 26a6cbe..71dd61b 100644
--- a/hyperparameter/hyperparameter.h
+++ b/hyperparameter/hyperparameter.h
@@ -32,7 +32,7 @@ namespace hyperparameter
         {
             return finalize((len >= 32 ? h32bytes(p, len, seed) : seed + PRIME5) + len, p + (len & ~0x1F), len & 0x1F);
         }
-
+        
     private:
         static constexpr uint64_t PRIME1 = 11400714785074694791ULL;
         static constexpr uint64_t PRIME2 = 14029467366897019727ULL;
@@ -191,6 +191,21 @@ namespace hyperparameter
     {
         return storage_put_str(_storage, key, val);
     }
+
+    std::shared_ptr<hyperparameter::Hyperparameter> get_hp() {
+      static std::shared_ptr<Hyperparameter> hp;
+      if (!hp) {
+        hp = hyperparameter::create_shared();
+      }
+      return hp;
+    }
 }
 
+#define GETHP hyperparameter::get_hp()  
+
+// Implicit create hyperparameter object
+#define GETPARAM(p, default_val)                                              \
+  (GETHP->get(([](){ constexpr uint64_t x = hyperparameter::xxhash(#p,sizeof(#p)-1); return x;})(), default_val))
+#define PUTPARAM(p, default_val) (GETHP->put(#p, default_val))
+
 #endif
\ No newline at end of file