diff --git a/go.mod b/go.mod
index 1ecca30..962a017 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/unistack-org/micro-register-service/v3
 go 1.16
 
 require (
-	github.com/unistack-org/micro/v3 v3.3.15
+	github.com/unistack-org/micro/v3 v3.3.16
 	google.golang.org/grpc v1.37.0
 	google.golang.org/protobuf v1.26.0
 )
diff --git a/go.sum b/go.sum
index b94fda4..f448770 100644
--- a/go.sum
+++ b/go.sum
@@ -41,8 +41,8 @@ github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:
 github.com/silas/dag v0.0.0-20210121180416-41cf55125c34/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
-github.com/unistack-org/micro/v3 v3.3.15 h1:rj+spzhezCg4gmj1nuF0FRGixC51/7xFACOchB/23/E=
-github.com/unistack-org/micro/v3 v3.3.15/go.mod h1:ETGcQQUcjxGaD44LUMX+0fgo8Loh7ExldfIPLvfUmDo=
+github.com/unistack-org/micro/v3 v3.3.16 h1:v0h/oC0TO2n1djQJeOjD2jNEqKkiykwI6cpflEVTlQE=
+github.com/unistack-org/micro/v3 v3.3.16/go.mod h1:ETGcQQUcjxGaD44LUMX+0fgo8Loh7ExldfIPLvfUmDo=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
diff --git a/micro/service_micro_rpc.pb.go b/micro/service_micro_rpc.pb.go
index 25d874c..20b6b70 100644
--- a/micro/service_micro_rpc.pb.go
+++ b/micro/service_micro_rpc.pb.go
@@ -158,8 +158,9 @@ func RegisterRegisterServer(s server.Server, sh RegisterServer, opts ...server.H
 		register
 	}
 	h := &registerServer{sh}
+	var nopts []server.HandlerOption
 	for _, endpoint := range NewRegisterEndpoints() {
-		opts = append(opts, api.WithEndpoint(endpoint))
+		nopts = append(nopts, api.WithEndpoint(endpoint))
 	}
-	return s.Handle(s.NewHandler(&Register{h}, opts...))
+	return s.Handle(s.NewHandler(&Register{h}, append(nopts, opts...)...))
 }
diff --git a/proto/service.pb.go b/proto/service.pb.go
index 9c24861..3846a56 100644
--- a/proto/service.pb.go
+++ b/proto/service.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.6.1
+// 	protoc        v3.15.6
 // source: service.proto
 
 package service
@@ -237,8 +237,8 @@ type Endpoint struct {
 	unknownFields protoimpl.UnknownFields
 
 	Name     string            `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	Request  *Value            `protobuf:"bytes,2,opt,name=request,proto3" json:"request,omitempty"`
-	Response *Value            `protobuf:"bytes,3,opt,name=response,proto3" json:"response,omitempty"`
+	Request  string            `protobuf:"bytes,2,opt,name=request,proto3" json:"request,omitempty"`
+	Response string            `protobuf:"bytes,3,opt,name=response,proto3" json:"response,omitempty"`
 	Metadata map[string]string `protobuf:"bytes,4,rep,name=metadata,proto3" json:"metadata,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
@@ -281,18 +281,18 @@ func (x *Endpoint) GetName() string {
 	return ""
 }
 
-func (x *Endpoint) GetRequest() *Value {
+func (x *Endpoint) GetRequest() string {
 	if x != nil {
 		return x.Request
 	}
-	return nil
+	return ""
 }
 
-func (x *Endpoint) GetResponse() *Value {
+func (x *Endpoint) GetResponse() string {
 	if x != nil {
 		return x.Response
 	}
-	return nil
+	return ""
 }
 
 func (x *Endpoint) GetMetadata() map[string]string {
@@ -302,70 +302,6 @@ func (x *Endpoint) GetMetadata() map[string]string {
 	return nil
 }
 
-// Value is an opaque value for a request or response
-type Value struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Name   string   `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	Type   string   `protobuf:"bytes,2,opt,name=type,proto3" json:"type,omitempty"`
-	Values []*Value `protobuf:"bytes,3,rep,name=values,proto3" json:"values,omitempty"`
-}
-
-func (x *Value) Reset() {
-	*x = Value{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_service_proto_msgTypes[3]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Value) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Value) ProtoMessage() {}
-
-func (x *Value) ProtoReflect() protoreflect.Message {
-	mi := &file_service_proto_msgTypes[3]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Value.ProtoReflect.Descriptor instead.
-func (*Value) Descriptor() ([]byte, []int) {
-	return file_service_proto_rawDescGZIP(), []int{3}
-}
-
-func (x *Value) GetName() string {
-	if x != nil {
-		return x.Name
-	}
-	return ""
-}
-
-func (x *Value) GetType() string {
-	if x != nil {
-		return x.Type
-	}
-	return ""
-}
-
-func (x *Value) GetValues() []*Value {
-	if x != nil {
-		return x.Values
-	}
-	return nil
-}
-
 // Options are registry options
 type Options struct {
 	state         protoimpl.MessageState
@@ -379,7 +315,7 @@ type Options struct {
 func (x *Options) Reset() {
 	*x = Options{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_service_proto_msgTypes[4]
+		mi := &file_service_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -392,7 +328,7 @@ func (x *Options) String() string {
 func (*Options) ProtoMessage() {}
 
 func (x *Options) ProtoReflect() protoreflect.Message {
-	mi := &file_service_proto_msgTypes[4]
+	mi := &file_service_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -405,7 +341,7 @@ func (x *Options) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Options.ProtoReflect.Descriptor instead.
 func (*Options) Descriptor() ([]byte, []int) {
-	return file_service_proto_rawDescGZIP(), []int{4}
+	return file_service_proto_rawDescGZIP(), []int{3}
 }
 
 func (x *Options) GetTtl() int64 {
@@ -436,7 +372,7 @@ type Result struct {
 func (x *Result) Reset() {
 	*x = Result{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_service_proto_msgTypes[5]
+		mi := &file_service_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -449,7 +385,7 @@ func (x *Result) String() string {
 func (*Result) ProtoMessage() {}
 
 func (x *Result) ProtoReflect() protoreflect.Message {
-	mi := &file_service_proto_msgTypes[5]
+	mi := &file_service_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -462,7 +398,7 @@ func (x *Result) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Result.ProtoReflect.Descriptor instead.
 func (*Result) Descriptor() ([]byte, []int) {
-	return file_service_proto_rawDescGZIP(), []int{5}
+	return file_service_proto_rawDescGZIP(), []int{4}
 }
 
 func (x *Result) GetAction() string {
@@ -495,7 +431,7 @@ type EmptyResponse struct {
 func (x *EmptyResponse) Reset() {
 	*x = EmptyResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_service_proto_msgTypes[6]
+		mi := &file_service_proto_msgTypes[5]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -508,7 +444,7 @@ func (x *EmptyResponse) String() string {
 func (*EmptyResponse) ProtoMessage() {}
 
 func (x *EmptyResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_service_proto_msgTypes[6]
+	mi := &file_service_proto_msgTypes[5]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -521,7 +457,7 @@ func (x *EmptyResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use EmptyResponse.ProtoReflect.Descriptor instead.
 func (*EmptyResponse) Descriptor() ([]byte, []int) {
-	return file_service_proto_rawDescGZIP(), []int{6}
+	return file_service_proto_rawDescGZIP(), []int{5}
 }
 
 type LookupRequest struct {
@@ -536,7 +472,7 @@ type LookupRequest struct {
 func (x *LookupRequest) Reset() {
 	*x = LookupRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_service_proto_msgTypes[7]
+		mi := &file_service_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -549,7 +485,7 @@ func (x *LookupRequest) String() string {
 func (*LookupRequest) ProtoMessage() {}
 
 func (x *LookupRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_service_proto_msgTypes[7]
+	mi := &file_service_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -562,7 +498,7 @@ func (x *LookupRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LookupRequest.ProtoReflect.Descriptor instead.
 func (*LookupRequest) Descriptor() ([]byte, []int) {
-	return file_service_proto_rawDescGZIP(), []int{7}
+	return file_service_proto_rawDescGZIP(), []int{6}
 }
 
 func (x *LookupRequest) GetService() string {
@@ -590,7 +526,7 @@ type LookupResponse struct {
 func (x *LookupResponse) Reset() {
 	*x = LookupResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_service_proto_msgTypes[8]
+		mi := &file_service_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -603,7 +539,7 @@ func (x *LookupResponse) String() string {
 func (*LookupResponse) ProtoMessage() {}
 
 func (x *LookupResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_service_proto_msgTypes[8]
+	mi := &file_service_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -616,7 +552,7 @@ func (x *LookupResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use LookupResponse.ProtoReflect.Descriptor instead.
 func (*LookupResponse) Descriptor() ([]byte, []int) {
-	return file_service_proto_rawDescGZIP(), []int{8}
+	return file_service_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *LookupResponse) GetServices() []*Service {
@@ -637,7 +573,7 @@ type ListRequest struct {
 func (x *ListRequest) Reset() {
 	*x = ListRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_service_proto_msgTypes[9]
+		mi := &file_service_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -650,7 +586,7 @@ func (x *ListRequest) String() string {
 func (*ListRequest) ProtoMessage() {}
 
 func (x *ListRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_service_proto_msgTypes[9]
+	mi := &file_service_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -663,7 +599,7 @@ func (x *ListRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListRequest.ProtoReflect.Descriptor instead.
 func (*ListRequest) Descriptor() ([]byte, []int) {
-	return file_service_proto_rawDescGZIP(), []int{9}
+	return file_service_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *ListRequest) GetOptions() *Options {
@@ -684,7 +620,7 @@ type ListResponse struct {
 func (x *ListResponse) Reset() {
 	*x = ListResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_service_proto_msgTypes[10]
+		mi := &file_service_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -697,7 +633,7 @@ func (x *ListResponse) String() string {
 func (*ListResponse) ProtoMessage() {}
 
 func (x *ListResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_service_proto_msgTypes[10]
+	mi := &file_service_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -710,7 +646,7 @@ func (x *ListResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ListResponse.ProtoReflect.Descriptor instead.
 func (*ListResponse) Descriptor() ([]byte, []int) {
-	return file_service_proto_rawDescGZIP(), []int{10}
+	return file_service_proto_rawDescGZIP(), []int{9}
 }
 
 func (x *ListResponse) GetServices() []*Service {
@@ -733,7 +669,7 @@ type WatchRequest struct {
 func (x *WatchRequest) Reset() {
 	*x = WatchRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_service_proto_msgTypes[11]
+		mi := &file_service_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -746,7 +682,7 @@ func (x *WatchRequest) String() string {
 func (*WatchRequest) ProtoMessage() {}
 
 func (x *WatchRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_service_proto_msgTypes[11]
+	mi := &file_service_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -759,7 +695,7 @@ func (x *WatchRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use WatchRequest.ProtoReflect.Descriptor instead.
 func (*WatchRequest) Descriptor() ([]byte, []int) {
-	return file_service_proto_rawDescGZIP(), []int{11}
+	return file_service_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *WatchRequest) GetService() string {
@@ -795,7 +731,7 @@ type Event struct {
 func (x *Event) Reset() {
 	*x = Event{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_service_proto_msgTypes[12]
+		mi := &file_service_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -808,7 +744,7 @@ func (x *Event) String() string {
 func (*Event) ProtoMessage() {}
 
 func (x *Event) ProtoReflect() protoreflect.Message {
-	mi := &file_service_proto_msgTypes[12]
+	mi := &file_service_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -821,7 +757,7 @@ func (x *Event) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Event.ProtoReflect.Descriptor instead.
 func (*Event) Descriptor() ([]byte, []int) {
-	return file_service_proto_rawDescGZIP(), []int{12}
+	return file_service_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *Event) GetId() string {
@@ -887,14 +823,12 @@ var file_service_proto_rawDesc = []byte{
 	0x0d, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10,
 	0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6b, 0x65, 0x79,
 	0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52,
-	0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38, 0x01, 0x22, 0xee, 0x01, 0x0a, 0x08, 0x45,
+	0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38, 0x01, 0x22, 0xce, 0x01, 0x0a, 0x08, 0x45,
 	0x6e, 0x64, 0x70, 0x6f, 0x69, 0x6e, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18,
-	0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x28, 0x0a, 0x07, 0x72,
-	0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x0e, 0x2e, 0x73,
-	0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x2e, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x52, 0x07, 0x72, 0x65,
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-	0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x0e, 0x2e, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63,
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+	0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x18, 0x0a, 0x07, 0x72,
+	0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x72, 0x65,
+	0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x1a, 0x0a, 0x08, 0x72, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
+	0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x72, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
 	0x65, 0x12, 0x3b, 0x0a, 0x08, 0x6d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0x18, 0x04, 0x20,
 	0x03, 0x28, 0x0b, 0x32, 0x1f, 0x2e, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x2e, 0x45, 0x6e,
 	0x64, 0x70, 0x6f, 0x69, 0x6e, 0x74, 0x2e, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0x45,
@@ -902,82 +836,77 @@ var file_service_proto_rawDesc = []byte{
 	0x0a, 0x0d, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12,
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+	0x69, 0x63, 0x65, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
+	0x65, 0x22, 0x00, 0x12, 0x3d, 0x0a, 0x0c, 0x4c, 0x69, 0x73, 0x74, 0x53, 0x65, 0x72, 0x76, 0x69,
+	0x63, 0x65, 0x73, 0x12, 0x14, 0x2e, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x2e, 0x4c, 0x69,
+	0x73, 0x74, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x15, 0x2e, 0x73, 0x65, 0x72, 0x76,
+	0x69, 0x63, 0x65, 0x2e, 0x4c, 0x69, 0x73, 0x74, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
+	0x22, 0x00, 0x12, 0x33, 0x0a, 0x05, 0x57, 0x61, 0x74, 0x63, 0x68, 0x12, 0x15, 0x2e, 0x73, 0x65,
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+	0x73, 0x74, 0x1a, 0x0f, 0x2e, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x2e, 0x52, 0x65, 0x73,
+	0x75, 0x6c, 0x74, 0x22, 0x00, 0x30, 0x01, 0x42, 0x41, 0x5a, 0x3f, 0x67, 0x69, 0x74, 0x68, 0x75,
+	0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x75, 0x6e, 0x69, 0x73, 0x74, 0x61, 0x63, 0x6b, 0x2d, 0x6f,
+	0x72, 0x67, 0x2f, 0x6d, 0x69, 0x63, 0x72, 0x6f, 0x2d, 0x72, 0x65, 0x67, 0x69, 0x73, 0x74, 0x65,
+	0x72, 0x2d, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x2f, 0x76, 0x33, 0x2f, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x3b, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
@@ -993,59 +922,55 @@ func file_service_proto_rawDescGZIP() []byte {
 }
 
 var file_service_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_service_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
+var file_service_proto_msgTypes = make([]protoimpl.MessageInfo, 15)
 var file_service_proto_goTypes = []interface{}{
 	(EventType)(0),         // 0: service.EventType
 	(*Service)(nil),        // 1: service.Service
 	(*Node)(nil),           // 2: service.Node
 	(*Endpoint)(nil),       // 3: service.Endpoint
-	(*Value)(nil),          // 4: service.Value
-	(*Options)(nil),        // 5: service.Options
-	(*Result)(nil),         // 6: service.Result
-	(*EmptyResponse)(nil),  // 7: service.EmptyResponse
-	(*LookupRequest)(nil),  // 8: service.LookupRequest
-	(*LookupResponse)(nil), // 9: service.LookupResponse
-	(*ListRequest)(nil),    // 10: service.ListRequest
-	(*ListResponse)(nil),   // 11: service.ListResponse
-	(*WatchRequest)(nil),   // 12: service.WatchRequest
-	(*Event)(nil),          // 13: service.Event
-	nil,                    // 14: service.Service.MetadataEntry
-	nil,                    // 15: service.Node.MetadataEntry
-	nil,                    // 16: service.Endpoint.MetadataEntry
+	(*Options)(nil),        // 4: service.Options
+	(*Result)(nil),         // 5: service.Result
+	(*EmptyResponse)(nil),  // 6: service.EmptyResponse
+	(*LookupRequest)(nil),  // 7: service.LookupRequest
+	(*LookupResponse)(nil), // 8: service.LookupResponse
+	(*ListRequest)(nil),    // 9: service.ListRequest
+	(*ListResponse)(nil),   // 10: service.ListResponse
+	(*WatchRequest)(nil),   // 11: service.WatchRequest
+	(*Event)(nil),          // 12: service.Event
+	nil,                    // 13: service.Service.MetadataEntry
+	nil,                    // 14: service.Node.MetadataEntry
+	nil,                    // 15: service.Endpoint.MetadataEntry
 }
 var file_service_proto_depIdxs = []int32{
-	14, // 0: service.Service.metadata:type_name -> service.Service.MetadataEntry
+	13, // 0: service.Service.metadata:type_name -> service.Service.MetadataEntry
 	3,  // 1: service.Service.endpoints:type_name -> service.Endpoint
 	2,  // 2: service.Service.nodes:type_name -> service.Node
-	5,  // 3: service.Service.options:type_name -> service.Options
-	15, // 4: service.Node.metadata:type_name -> service.Node.MetadataEntry
-	4,  // 5: service.Endpoint.request:type_name -> service.Value
-	4,  // 6: service.Endpoint.response:type_name -> service.Value
-	16, // 7: service.Endpoint.metadata:type_name -> service.Endpoint.MetadataEntry
-	4,  // 8: service.Value.values:type_name -> service.Value
-	1,  // 9: service.Result.service:type_name -> service.Service
-	5,  // 10: service.LookupRequest.options:type_name -> service.Options
-	1,  // 11: service.LookupResponse.services:type_name -> service.Service
-	5,  // 12: service.ListRequest.options:type_name -> service.Options
-	1,  // 13: service.ListResponse.services:type_name -> service.Service
-	5,  // 14: service.WatchRequest.options:type_name -> service.Options
-	0,  // 15: service.Event.type:type_name -> service.EventType
-	1,  // 16: service.Event.service:type_name -> service.Service
-	8,  // 17: service.Register.LookupService:input_type -> service.LookupRequest
-	1,  // 18: service.Register.Register:input_type -> service.Service
-	1,  // 19: service.Register.Deregister:input_type -> service.Service
-	10, // 20: service.Register.ListServices:input_type -> service.ListRequest
-	12, // 21: service.Register.Watch:input_type -> service.WatchRequest
-	9,  // 22: service.Register.LookupService:output_type -> service.LookupResponse
-	7,  // 23: service.Register.Register:output_type -> service.EmptyResponse
-	7,  // 24: service.Register.Deregister:output_type -> service.EmptyResponse
-	11, // 25: service.Register.ListServices:output_type -> service.ListResponse
-	6,  // 26: service.Register.Watch:output_type -> service.Result
-	22, // [22:27] is the sub-list for method output_type
-	17, // [17:22] is the sub-list for method input_type
-	17, // [17:17] is the sub-list for extension type_name
-	17, // [17:17] is the sub-list for extension extendee
-	0,  // [0:17] is the sub-list for field type_name
+	4,  // 3: service.Service.options:type_name -> service.Options
+	14, // 4: service.Node.metadata:type_name -> service.Node.MetadataEntry
+	15, // 5: service.Endpoint.metadata:type_name -> service.Endpoint.MetadataEntry
+	1,  // 6: service.Result.service:type_name -> service.Service
+	4,  // 7: service.LookupRequest.options:type_name -> service.Options
+	1,  // 8: service.LookupResponse.services:type_name -> service.Service
+	4,  // 9: service.ListRequest.options:type_name -> service.Options
+	1,  // 10: service.ListResponse.services:type_name -> service.Service
+	4,  // 11: service.WatchRequest.options:type_name -> service.Options
+	0,  // 12: service.Event.type:type_name -> service.EventType
+	1,  // 13: service.Event.service:type_name -> service.Service
+	7,  // 14: service.Register.LookupService:input_type -> service.LookupRequest
+	1,  // 15: service.Register.Register:input_type -> service.Service
+	1,  // 16: service.Register.Deregister:input_type -> service.Service
+	9,  // 17: service.Register.ListServices:input_type -> service.ListRequest
+	11, // 18: service.Register.Watch:input_type -> service.WatchRequest
+	8,  // 19: service.Register.LookupService:output_type -> service.LookupResponse
+	6,  // 20: service.Register.Register:output_type -> service.EmptyResponse
+	6,  // 21: service.Register.Deregister:output_type -> service.EmptyResponse
+	10, // 22: service.Register.ListServices:output_type -> service.ListResponse
+	5,  // 23: service.Register.Watch:output_type -> service.Result
+	19, // [19:24] is the sub-list for method output_type
+	14, // [14:19] is the sub-list for method input_type
+	14, // [14:14] is the sub-list for extension type_name
+	14, // [14:14] is the sub-list for extension extendee
+	0,  // [0:14] is the sub-list for field type_name
 }
 
 func init() { file_service_proto_init() }
@@ -1091,18 +1016,6 @@ func file_service_proto_init() {
 			}
 		}
 		file_service_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Value); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_service_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Options); i {
 			case 0:
 				return &v.state
@@ -1114,7 +1027,7 @@ func file_service_proto_init() {
 				return nil
 			}
 		}
-		file_service_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
+		file_service_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Result); i {
 			case 0:
 				return &v.state
@@ -1126,7 +1039,7 @@ func file_service_proto_init() {
 				return nil
 			}
 		}
-		file_service_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
+		file_service_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*EmptyResponse); i {
 			case 0:
 				return &v.state
@@ -1138,7 +1051,7 @@ func file_service_proto_init() {
 				return nil
 			}
 		}
-		file_service_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
+		file_service_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupRequest); i {
 			case 0:
 				return &v.state
@@ -1150,7 +1063,7 @@ func file_service_proto_init() {
 				return nil
 			}
 		}
-		file_service_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
+		file_service_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LookupResponse); i {
 			case 0:
 				return &v.state
@@ -1162,7 +1075,7 @@ func file_service_proto_init() {
 				return nil
 			}
 		}
-		file_service_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
+		file_service_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ListRequest); i {
 			case 0:
 				return &v.state
@@ -1174,7 +1087,7 @@ func file_service_proto_init() {
 				return nil
 			}
 		}
-		file_service_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
+		file_service_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ListResponse); i {
 			case 0:
 				return &v.state
@@ -1186,7 +1099,7 @@ func file_service_proto_init() {
 				return nil
 			}
 		}
-		file_service_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
+		file_service_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*WatchRequest); i {
 			case 0:
 				return &v.state
@@ -1198,7 +1111,7 @@ func file_service_proto_init() {
 				return nil
 			}
 		}
-		file_service_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
+		file_service_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Event); i {
 			case 0:
 				return &v.state
@@ -1217,7 +1130,7 @@ func file_service_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_service_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   16,
+			NumMessages:   15,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/proto/service.proto b/proto/service.proto
index d1b6126..24aa990 100644
--- a/proto/service.proto
+++ b/proto/service.proto
@@ -32,18 +32,11 @@ message Node {
 // Endpoint is a endpoint provided by a service
 message Endpoint {
 	string name = 1;
-	Value request = 2;
-	Value response = 3;
+	string request = 2;
+	string response = 3;
 	map<string, string> metadata = 4;
 }
 
-// Value is an opaque value for a request or response
-message Value {
-	string name = 1;
-	string type = 2;
-	repeated Value values = 3;
-}
-
 // Options are registry options
 message Options {
 	int64 ttl = 1;
diff --git a/service_test.go b/service_test.go
new file mode 100644
index 0000000..5f4810a
--- /dev/null
+++ b/service_test.go
@@ -0,0 +1,7 @@
+package service
+
+import "testing"
+
+func TestService(t *testing.T) {
+
+}
diff --git a/util.go b/util.go
index bee0686..d0a5793 100644
--- a/util.go
+++ b/util.go
@@ -5,63 +5,13 @@ import (
 	"github.com/unistack-org/micro/v3/register"
 )
 
-func values(v []*register.Value) []*pb.Value {
-	if len(v) == 0 {
-		return []*pb.Value{}
-	}
-
-	vs := make([]*pb.Value, 0, len(v))
-	for _, vi := range v {
-		vs = append(vs, &pb.Value{
-			Name:   vi.Name,
-			Type:   vi.Type,
-			Values: values(vi.Values),
-		})
-	}
-	return vs
-}
-
-func toValues(v []*pb.Value) []*register.Value {
-	if len(v) == 0 {
-		return []*register.Value{}
-	}
-
-	vs := make([]*register.Value, 0, len(v))
-	for _, vi := range v {
-		vs = append(vs, &register.Value{
-			Name:   vi.Name,
-			Type:   vi.Type,
-			Values: toValues(vi.Values),
-		})
-	}
-	return vs
-}
-
 func ToProto(s *register.Service) *pb.Service {
 	endpoints := make([]*pb.Endpoint, 0, len(s.Endpoints))
 	for _, ep := range s.Endpoints {
-		var request, response *pb.Value
-
-		if ep.Request != nil {
-			request = &pb.Value{
-				Name:   ep.Request.Name,
-				Type:   ep.Request.Type,
-				Values: values(ep.Request.Values),
-			}
-		}
-
-		if ep.Response != nil {
-			response = &pb.Value{
-				Name:   ep.Response.Name,
-				Type:   ep.Response.Type,
-				Values: values(ep.Response.Values),
-			}
-		}
-
 		endpoints = append(endpoints, &pb.Endpoint{
 			Name:     ep.Name,
-			Request:  request,
-			Response: response,
+			Request:  ep.Request,
+			Response: ep.Response,
 			Metadata: ep.Metadata,
 		})
 	}
@@ -89,28 +39,10 @@ func ToProto(s *register.Service) *pb.Service {
 func ToService(s *pb.Service) *register.Service {
 	endpoints := make([]*register.Endpoint, 0, len(s.Endpoints))
 	for _, ep := range s.Endpoints {
-		var request, response *register.Value
-
-		if ep.Request != nil {
-			request = &register.Value{
-				Name:   ep.Request.Name,
-				Type:   ep.Request.Type,
-				Values: toValues(ep.Request.Values),
-			}
-		}
-
-		if ep.Response != nil {
-			response = &register.Value{
-				Name:   ep.Response.Name,
-				Type:   ep.Response.Type,
-				Values: toValues(ep.Response.Values),
-			}
-		}
-
 		endpoints = append(endpoints, &register.Endpoint{
 			Name:     ep.Name,
-			Request:  request,
-			Response: response,
+			Request:  ep.Request,
+			Response: ep.Response,
 			Metadata: ep.Metadata,
 		})
 	}