diff --git a/clients/ui/bff/README.md b/clients/ui/bff/README.md
index 24c27384..5d912fa2 100644
--- a/clients/ui/bff/README.md
+++ b/clients/ui/bff/README.md
@@ -73,13 +73,13 @@ curl -i localhost:4000/api/v1/model_registry
 ```
 ```
 # GET /v1/model_registry/{model_registry_id}/registered_models
-curl -i localhost:4000/api/v1/model_registry/model_registry_1/registered_models
+curl -i localhost:4000/api/v1/model_registry/model-registry/registered_models
 ```
 ```
 #POST /v1/model_registry/{model_registry_id}/registered_models
-curl -i -X POST "http://localhost:4000/api/v1/model_registry/model_registry/registered_models" \
+curl -i -X POST "http://localhost:4000/api/v1/model_registry/model-registry/registered_models" \
      -H "Content-Type: application/json" \
-     -d '{
+     -d '{ "data": {
   "customProperties": {
     "my-label9": {
       "metadataType": "MetadataStringValue",
@@ -91,9 +91,9 @@ curl -i -X POST "http://localhost:4000/api/v1/model_registry/model_registry/regi
   "name": "bella",
   "owner": "eder",
   "state": "LIVE"
-}'
+}}'
 ```
 ```
 # GET /v1/model_registry/{model_registry_id}/registered_models/{registered_model_id}
-curl -i localhost:4000/api/v1/model_registry/model_registry/registered_models/1
+curl -i localhost:4000/api/v1/model_registry/model-registry/registered_models/1
 ```
diff --git a/clients/ui/bff/api/errors.go b/clients/ui/bff/api/errors.go
index 6a28e0fb..b70b8aaf 100644
--- a/clients/ui/bff/api/errors.go
+++ b/clients/ui/bff/api/errors.go
@@ -18,6 +18,10 @@ type ErrorResponse struct {
 	Message string `json:"message"`
 }
 
+type ErrorEnvelope struct {
+	Error *integrations.HTTPError `json:"error"`
+}
+
 func (app *App) LogError(r *http.Request, err error) {
 	var (
 		method = r.Method
@@ -40,7 +44,7 @@ func (app *App) badRequestResponse(w http.ResponseWriter, r *http.Request, err e
 
 func (app *App) errorResponse(w http.ResponseWriter, r *http.Request, error *integrations.HTTPError) {
 
-	env := Envelope{"error": error}
+	env := ErrorEnvelope{Error: error}
 
 	err := app.WriteJSON(w, error.StatusCode, env, nil)
 
diff --git a/clients/ui/bff/api/helpers.go b/clients/ui/bff/api/helpers.go
index f35851af..a129e335 100644
--- a/clients/ui/bff/api/helpers.go
+++ b/clients/ui/bff/api/helpers.go
@@ -9,9 +9,12 @@ import (
 	"strings"
 )
 
-type Envelope map[string]interface{}
+type Envelope[D any, M any] struct {
+	Data     D `json:"data,omitempty"`
+	Metadata M `json:"metadata,omitempty"`
+}
 
-type TypedEnvelope[T any] map[string]T
+type None *struct{}
 
 func (app *App) WriteJSON(w http.ResponseWriter, status int, data any, headers http.Header) error {
 
@@ -29,7 +32,11 @@ func (app *App) WriteJSON(w http.ResponseWriter, status int, data any, headers h
 
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(status)
-	w.Write(js)
+	_, err = w.Write(js)
+
+	if err != nil {
+		return err
+	}
 
 	return nil
 }
diff --git a/clients/ui/bff/api/model_registry_handler.go b/clients/ui/bff/api/model_registry_handler.go
index 5a99b84f..8a85870c 100644
--- a/clients/ui/bff/api/model_registry_handler.go
+++ b/clients/ui/bff/api/model_registry_handler.go
@@ -2,9 +2,12 @@ package api
 
 import (
 	"github.com/julienschmidt/httprouter"
+	"github.com/kubeflow/model-registry/ui/bff/data"
 	"net/http"
 )
 
+type ModelRegistryListEnvelope Envelope[[]data.ModelRegistryModel, None]
+
 func (app *App) ModelRegistryHandler(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
 
 	registries, err := app.models.ModelRegistry.FetchAllModelRegistries(app.kubernetesClient)
@@ -13,8 +16,8 @@ func (app *App) ModelRegistryHandler(w http.ResponseWriter, r *http.Request, ps
 		return
 	}
 
-	modelRegistryRes := Envelope{
-		"model_registry": registries,
+	modelRegistryRes := ModelRegistryListEnvelope{
+		Data: registries,
 	}
 
 	err = app.WriteJSON(w, http.StatusOK, modelRegistryRes, nil)
diff --git a/clients/ui/bff/api/model_registry_handler_test.go b/clients/ui/bff/api/model_registry_handler_test.go
index 8f05372e..0b4949d5 100644
--- a/clients/ui/bff/api/model_registry_handler_test.go
+++ b/clients/ui/bff/api/model_registry_handler_test.go
@@ -29,28 +29,20 @@ func TestModelRegistryHandler(t *testing.T) {
 	defer rs.Body.Close()
 	body, err := io.ReadAll(rs.Body)
 	assert.NoError(t, err)
-	var modelRegistryRes Envelope
-	err = json.Unmarshal(body, &modelRegistryRes)
+	var actual ModelRegistryListEnvelope
+	err = json.Unmarshal(body, &actual)
 	assert.NoError(t, err)
 
 	assert.Equal(t, http.StatusOK, rr.Code)
 
-	// Convert the unmarshalled data to the expected type
-	actualModelRegistry := make([]data.ModelRegistryModel, 0)
-	for _, v := range modelRegistryRes["model_registry"].([]interface{}) {
-		model := v.(map[string]interface{})
-		actualModelRegistry = append(actualModelRegistry, data.ModelRegistryModel{Name: model["name"].(string), Description: model["description"].(string), DisplayName: model["displayName"].(string)})
-	}
-	modelRegistryRes["model_registry"] = actualModelRegistry
-
-	var expected = Envelope{
-		"model_registry": []data.ModelRegistryModel{
+	var expected = ModelRegistryListEnvelope{
+		Data: []data.ModelRegistryModel{
 			{Name: "model-registry", Description: "Model registry description", DisplayName: "Model Registry"},
 			{Name: "model-registry-dora", Description: "Model registry dora description", DisplayName: "Model Registry Dora"},
 			{Name: "model-registry-bella", Description: "Model registry bella description", DisplayName: "Model Registry Bella"},
 		},
 	}
 
-	assert.Equal(t, expected, modelRegistryRes)
+	assert.Equal(t, expected, actual)
 
 }
diff --git a/clients/ui/bff/api/registered_models_handler.go b/clients/ui/bff/api/registered_models_handler.go
index 9e47d833..3e8cc71c 100644
--- a/clients/ui/bff/api/registered_models_handler.go
+++ b/clients/ui/bff/api/registered_models_handler.go
@@ -11,6 +11,9 @@ import (
 	"net/http"
 )
 
+type RegisteredModelEnvelope Envelope[*openapi.RegisteredModel, None]
+type RegisteredModelListEnvelope Envelope[*openapi.RegisteredModelList, None]
+
 func (app *App) GetAllRegisteredModelsHandler(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
 	//TODO (ederign) implement pagination
 	client, ok := r.Context().Value(httpClientKey).(integrations.HTTPClientInterface)
@@ -25,8 +28,8 @@ func (app *App) GetAllRegisteredModelsHandler(w http.ResponseWriter, r *http.Req
 		return
 	}
 
-	modelRegistryRes := Envelope{
-		"registered_model_list": modelList,
+	modelRegistryRes := RegisteredModelListEnvelope{
+		Data: modelList,
 	}
 
 	err = app.WriteJSON(w, http.StatusOK, modelRegistryRes, nil)
@@ -42,18 +45,20 @@ func (app *App) CreateRegisteredModelHandler(w http.ResponseWriter, r *http.Requ
 		return
 	}
 
-	var model openapi.RegisteredModel
-	if err := json.NewDecoder(r.Body).Decode(&model); err != nil {
+	var envelope RegisteredModelEnvelope
+	if err := json.NewDecoder(r.Body).Decode(&envelope); err != nil {
 		app.serverErrorResponse(w, r, fmt.Errorf("error decoding JSON:: %v", err.Error()))
 		return
 	}
 
-	if err := validation.ValidateRegisteredModel(model); err != nil {
+	data := *envelope.Data
+
+	if err := validation.ValidateRegisteredModel(data); err != nil {
 		app.badRequestResponse(w, r, fmt.Errorf("validation error:: %v", err.Error()))
 		return
 	}
 
-	jsonData, err := json.Marshal(model)
+	jsonData, err := json.Marshal(data)
 	if err != nil {
 		app.serverErrorResponse(w, r, fmt.Errorf("error marshaling model to JSON: %w", err))
 		return
@@ -75,8 +80,11 @@ func (app *App) CreateRegisteredModelHandler(w http.ResponseWriter, r *http.Requ
 		return
 	}
 
+	response := RegisteredModelEnvelope{
+		Data: createdModel,
+	}
 	w.Header().Set("Location", fmt.Sprintf("%s/%s", RegisteredModelsPath, *createdModel.Id))
-	err = app.WriteJSON(w, http.StatusCreated, createdModel, nil)
+	err = app.WriteJSON(w, http.StatusCreated, response, nil)
 	if err != nil {
 		app.serverErrorResponse(w, r, fmt.Errorf("error writing JSON"))
 		return
@@ -101,8 +109,8 @@ func (app *App) GetRegisteredModelHandler(w http.ResponseWriter, r *http.Request
 		return
 	}
 
-	result := Envelope{
-		"registered_model": model,
+	result := RegisteredModelEnvelope{
+		Data: model,
 	}
 
 	err = app.WriteJSON(w, http.StatusOK, result, nil)
diff --git a/clients/ui/bff/api/registered_models_handler_test.go b/clients/ui/bff/api/registered_models_handler_test.go
index ec1eb039..0e6deba6 100644
--- a/clients/ui/bff/api/registered_models_handler_test.go
+++ b/clients/ui/bff/api/registered_models_handler_test.go
@@ -22,7 +22,7 @@ func TestGetRegisteredModelHandler(t *testing.T) {
 	}
 
 	req, err := http.NewRequest(http.MethodGet,
-		"/api/v1/model-registry/model-registry/registered_models/1", nil)
+		"/api/v1/model_registry/model-registry/registered_models/1", nil)
 	assert.NoError(t, err)
 
 	ctx := context.WithValue(req.Context(), httpClientKey, mockClient)
@@ -37,19 +37,21 @@ func TestGetRegisteredModelHandler(t *testing.T) {
 
 	body, err := io.ReadAll(rs.Body)
 	assert.NoError(t, err)
-	var registeredModelRes TypedEnvelope[openapi.RegisteredModel]
+	var registeredModelRes RegisteredModelEnvelope
 	err = json.Unmarshal(body, &registeredModelRes)
 	assert.NoError(t, err)
 
 	assert.Equal(t, http.StatusOK, rr.Code)
 
-	var expected = TypedEnvelope[openapi.RegisteredModel]{
-		"registered_model": mocks.GetRegisteredModelMocks()[0],
+	mockModel := mocks.GetRegisteredModelMocks()[0]
+
+	var expected = RegisteredModelEnvelope{
+		Data: &mockModel,
 	}
 
 	//TODO assert the full structure, I couldn't get unmarshalling to work for the full customProperties values
 	// this issue is in the test only
-	assert.Equal(t, expected["registered_model"].Name, registeredModelRes["registered_model"].Name)
+	assert.Equal(t, expected.Data.Name, registeredModelRes.Data.Name)
 }
 
 func TestGetAllRegisteredModelsHandler(t *testing.T) {
@@ -61,7 +63,7 @@ func TestGetAllRegisteredModelsHandler(t *testing.T) {
 	}
 
 	req, err := http.NewRequest(http.MethodGet,
-		"/api/v1/model-registry/model-registry/registered_models", nil)
+		"/api/v1/model_registry/model-registry/registered_models", nil)
 	assert.NoError(t, err)
 
 	ctx := context.WithValue(req.Context(), httpClientKey, mockClient)
@@ -76,20 +78,22 @@ func TestGetAllRegisteredModelsHandler(t *testing.T) {
 
 	body, err := io.ReadAll(rs.Body)
 	assert.NoError(t, err)
-	var registeredModelsListRes TypedEnvelope[openapi.RegisteredModelList]
+	var registeredModelsListRes RegisteredModelListEnvelope
 	err = json.Unmarshal(body, &registeredModelsListRes)
 	assert.NoError(t, err)
 
 	assert.Equal(t, http.StatusOK, rr.Code)
 
-	var expected = TypedEnvelope[openapi.RegisteredModelList]{
-		"registered_model_list": mocks.GetRegisteredModelListMock(),
+	modelList := mocks.GetRegisteredModelListMock()
+
+	var expected = RegisteredModelListEnvelope{
+		Data: &modelList,
 	}
 
-	assert.Equal(t, expected["registered_model_list"].Size, registeredModelsListRes["registered_model_list"].Size)
-	assert.Equal(t, expected["registered_model_list"].PageSize, registeredModelsListRes["registered_model_list"].PageSize)
-	assert.Equal(t, expected["registered_model_list"].NextPageToken, registeredModelsListRes["registered_model_list"].NextPageToken)
-	assert.Equal(t, len(expected["registered_model_list"].Items), len(registeredModelsListRes["registered_model_list"].Items))
+	assert.Equal(t, expected.Data.Size, registeredModelsListRes.Data.Size)
+	assert.Equal(t, expected.Data.PageSize, registeredModelsListRes.Data.PageSize)
+	assert.Equal(t, expected.Data.NextPageToken, registeredModelsListRes.Data.NextPageToken)
+	assert.Equal(t, len(expected.Data.Items), len(registeredModelsListRes.Data.Items))
 }
 
 func TestCreateRegisteredModelHandler(t *testing.T) {
@@ -100,14 +104,16 @@ func TestCreateRegisteredModelHandler(t *testing.T) {
 		modelRegistryClient: mockMRClient,
 	}
 
-	newModel := openapi.NewRegisteredModelCreate("Model One")
-	newModelJSON, err := newModel.MarshalJSON()
+	newModel := openapi.NewRegisteredModel("Model One")
+	newEnvelope := RegisteredModelEnvelope{Data: newModel}
+
+	newModelJSON, err := json.Marshal(newEnvelope)
 	assert.NoError(t, err)
 
 	reqBody := bytes.NewReader(newModelJSON)
 
 	req, err := http.NewRequest(http.MethodPost,
-		"/api/v1/model-registry/model-registry/registered_models", reqBody)
+		"/api/v1/model_registry/model-registry/registered_models", reqBody)
 	assert.NoError(t, err)
 
 	ctx := context.WithValue(req.Context(), httpClientKey, mockClient)
@@ -122,14 +128,14 @@ func TestCreateRegisteredModelHandler(t *testing.T) {
 
 	body, err := io.ReadAll(rs.Body)
 	assert.NoError(t, err)
-	var registeredModelRes openapi.RegisteredModel
-	err = json.Unmarshal(body, &registeredModelRes)
+	var actual RegisteredModelEnvelope
+	err = json.Unmarshal(body, &actual)
 	assert.NoError(t, err)
 
 	assert.Equal(t, http.StatusCreated, rr.Code)
 
 	var expected = mocks.GetRegisteredModelMocks()[0]
 
-	assert.Equal(t, expected.Name, registeredModelRes.Name)
+	assert.Equal(t, expected.Name, actual.Data.Name)
 	assert.NotEmpty(t, rs.Header.Get("location"))
 }