diff --git a/services/api/service.go b/services/api/service.go
index c6d4291f..197f6ce2 100644
--- a/services/api/service.go
+++ b/services/api/service.go
@@ -825,7 +825,7 @@ func (api *RelayAPI) RespondOK(w http.ResponseWriter, response any) {
 }
 
 func (api *RelayAPI) RespondMsg(w http.ResponseWriter, code int, msg string) {
-	api.Respond(w, code, struct{ message string }{message: msg})
+	api.Respond(w, code, MessageResp{msg})
 }
 
 func (api *RelayAPI) Respond(w http.ResponseWriter, code int, response any) {
diff --git a/services/api/service_test.go b/services/api/service_test.go
index b9c6e361..2d4e651f 100644
--- a/services/api/service_test.go
+++ b/services/api/service_test.go
@@ -199,6 +199,14 @@ func TestStatus(t *testing.T) {
 	require.Equal(t, http.StatusOK, rr.Code)
 }
 
+func TestLivez(t *testing.T) {
+	backend := newTestBackend(t, 1)
+	path := "/livez"
+	rr := backend.request(http.MethodGet, path, nil)
+	require.Equal(t, http.StatusOK, rr.Code)
+	require.Equal(t, "{\"message\":\"ok\"}\n", rr.Body.String())
+}
+
 func TestRegisterValidator(t *testing.T) {
 	path := "/eth/v1/builder/validators"
 
diff --git a/services/api/types.go b/services/api/types.go
index bb732ebf..d6dfb3d6 100644
--- a/services/api/types.go
+++ b/services/api/types.go
@@ -11,6 +11,9 @@ var (
 	ErrMissingSecretKey   = errors.New("secret key is nil")
 	ErrEmptyPayload       = errors.New("nil payload")
 	ErrInvalidTransaction = errors.New("invalid transaction")
+
+	NilResponse = struct{}{}
+	ZeroU256    = boostTypes.IntToU256(0)
 )
 
 type HTTPErrorResp struct {
@@ -18,6 +21,6 @@ type HTTPErrorResp struct {
 	Message string `json:"message"`
 }
 
-var NilResponse = struct{}{}
-
-var ZeroU256 = boostTypes.IntToU256(0)
+type MessageResp struct {
+	Message string `json:"message"`
+}