diff --git a/internal/sbi/api_onepunchman.go b/internal/sbi/api_onepunchman.go
new file mode 100644
index 0000000..65cf7c1
--- /dev/null
+++ b/internal/sbi/api_onepunchman.go
@@ -0,0 +1,44 @@
+package sbi
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+func (s *Server) getOnePunchManRoute() []Route {
+	return []Route{
+		{
+			Name:    "I'm bald, and stronger",
+			Method:  http.MethodGet,
+			Pattern: "/",
+			APIFunc: func(c *gin.Context) {
+				c.JSON(http.StatusOK, "I'm bald, and stronger")
+			},
+			// Use
+			// curl -X GET http://127.0.0.163:8000/onepunchman/ -w "\n"
+		},
+		{
+			Name:    "Echo POST",
+			Method:  http.MethodPost,
+			Pattern: "/echo",
+			APIFunc: s.HTTPOnePunchManEcho,
+			// curl -X POST http://127.0.0.163:8000/onepunchman/echo \
+			//   -H "Content-Type: application/json" \
+			//   -d '{"name":"Saitama","power":100}'
+		},
+	}
+}
+
+func (s *Server) HTTPOnePunchManEcho(c *gin.Context) {
+	// 定義一個 map 接收 JSON
+	var requestData map[string]interface{}
+	if err := c.ShouldBindJSON(&requestData); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{
+		"message": "Received your data!",
+		"data":    requestData,
+	})
+}
diff --git a/internal/sbi/api_onepunchman_test.go b/internal/sbi/api_onepunchman_test.go
new file mode 100644
index 0000000..206589c
--- /dev/null
+++ b/internal/sbi/api_onepunchman_test.go
@@ -0,0 +1,80 @@
+package sbi_test
+
+import (
+	"bytes"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/Alonza0314/nf-example/internal/sbi"
+	"github.com/Alonza0314/nf-example/pkg/factory"
+	"github.com/gin-gonic/gin"
+	"go.uber.org/mock/gomock"
+)
+
+func Test_OnePunchManAPI(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	// 建立 Mock nfApp
+	mockCtrl := gomock.NewController(t)
+	defer mockCtrl.Finish()
+	nfApp := sbi.NewMocknfApp(mockCtrl)
+	nfApp.EXPECT().Config().Return(&factory.Config{
+		Configuration: &factory.Configuration{
+			Sbi: &factory.Sbi{Port: 8000},
+		},
+	}).AnyTimes()
+
+	// 建立整個伺服器
+	server := sbi.NewServer(nfApp, "")
+
+	// -----------------------
+	// 測試 POST /onepunchman/echo
+	// -----------------------
+	t.Run("POST /onepunchman/echo", func(t *testing.T) {
+		const EXPECTED_STATUS = http.StatusOK
+		const EXPECTED_BODY = `{"data":{"name":"Saitama","power":100},"message":"Received your data!"}`
+
+		httpRecorder := httptest.NewRecorder()
+		ginCtx, _ := gin.CreateTestContext(httpRecorder)
+		body := bytes.NewBuffer([]byte(`{"name":"Saitama","power":100}`))
+
+		var err error
+		ginCtx.Request, err = http.NewRequest("POST", "/onepunchman/echo", body)
+		if err != nil {
+			t.Errorf("Failed to create request: %s", err)
+			return
+		}
+		server.HTTPOnePunchManEcho(ginCtx)
+
+		if httpRecorder.Code != EXPECTED_STATUS {
+			t.Errorf("Expected status code %d, got %d", EXPECTED_STATUS, httpRecorder.Code)
+		}
+		if httpRecorder.Body.String() != EXPECTED_BODY {
+			t.Errorf("Expected body %s, got %s", EXPECTED_BODY, httpRecorder.Body.String())
+		}
+	})
+
+	// -----------------------
+	// 測試 POST /onepunchman/echo 傳錯格式
+	// -----------------------
+	t.Run("POST /onepunchman/echo invalid json", func(t *testing.T) {
+		const EXPECTED_STATUS = http.StatusBadRequest
+
+		httpRecorder := httptest.NewRecorder()
+		ginCtx, _ := gin.CreateTestContext(httpRecorder)
+
+		body := bytes.NewBuffer([]byte(`invalid_json`))
+		var err error
+		ginCtx.Request, err = http.NewRequest("POST", "/onepunchman/echo", body)
+		if err != nil {
+			t.Errorf("Failed to create request: %s", err)
+			return
+		}
+		server.HTTPOnePunchManEcho(ginCtx)
+
+		if httpRecorder.Code != EXPECTED_STATUS {
+			t.Errorf("Expected status code %d, got %d", EXPECTED_STATUS, httpRecorder.Code)
+		}
+	})
+}
diff --git a/internal/sbi/router.go b/internal/sbi/router.go
index 49ee563..2584eaf 100644
--- a/internal/sbi/router.go
+++ b/internal/sbi/router.go
@@ -65,6 +65,9 @@ func newRouter(s *Server) *gin.Engine {
 	fortuneGroup := router.Group("/fortune")
 	applyRoutes(fortuneGroup, s.getFortuneRoute())
 
+	onePunchManGroup := router.Group("/onepunchman")
+	applyRoutes(onePunchManGroup, s.getOnePunchManRoute())
+
 	timeZoneGroup := router.Group("/timezone")
 	applyRoutes(timeZoneGroup, s.getTimeZoneRoute())