diff --git a/pkg/pb/bbgo.pb.go b/pkg/pb/bbgo.pb.go
index 0f839a7e3..45cfaa3a8 100644
--- a/pkg/pb/bbgo.pb.go
+++ b/pkg/pb/bbgo.pb.go
@@ -20,6 +20,99 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+type Empty struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *Empty) Reset() {
+	*x = Empty{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_bbgo_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Empty) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Empty) ProtoMessage() {}
+
+func (x *Empty) ProtoReflect() protoreflect.Message {
+	mi := &file_bbgo_proto_msgTypes[0]
+	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 Empty.ProtoReflect.Descriptor instead.
+func (*Empty) Descriptor() ([]byte, []int) {
+	return file_bbgo_proto_rawDescGZIP(), []int{0}
+}
+
+type Error struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	ErrorCode    int64  `protobuf:"varint,1,opt,name=error_code,json=errorCode,proto3" json:"error_code,omitempty"`
+	ErrorMessage string `protobuf:"bytes,2,opt,name=error_message,json=errorMessage,proto3" json:"error_message,omitempty"`
+}
+
+func (x *Error) Reset() {
+	*x = Error{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_bbgo_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Error) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Error) ProtoMessage() {}
+
+func (x *Error) ProtoReflect() protoreflect.Message {
+	mi := &file_bbgo_proto_msgTypes[1]
+	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 Error.ProtoReflect.Descriptor instead.
+func (*Error) Descriptor() ([]byte, []int) {
+	return file_bbgo_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *Error) GetErrorCode() int64 {
+	if x != nil {
+		return x.ErrorCode
+	}
+	return 0
+}
+
+func (x *Error) GetErrorMessage() string {
+	if x != nil {
+		return x.ErrorMessage
+	}
+	return ""
+}
+
 type SubscribeRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -31,7 +124,7 @@ type SubscribeRequest struct {
 func (x *SubscribeRequest) Reset() {
 	*x = SubscribeRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[0]
+		mi := &file_bbgo_proto_msgTypes[2]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -44,7 +137,7 @@ func (x *SubscribeRequest) String() string {
 func (*SubscribeRequest) ProtoMessage() {}
 
 func (x *SubscribeRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[0]
+	mi := &file_bbgo_proto_msgTypes[2]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -57,7 +150,7 @@ func (x *SubscribeRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use SubscribeRequest.ProtoReflect.Descriptor instead.
 func (*SubscribeRequest) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{0}
+	return file_bbgo_proto_rawDescGZIP(), []int{2}
 }
 
 func (x *SubscribeRequest) GetSubscriptions() []*Subscription {
@@ -81,7 +174,7 @@ type Subscription struct {
 func (x *Subscription) Reset() {
 	*x = Subscription{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[1]
+		mi := &file_bbgo_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -94,7 +187,7 @@ func (x *Subscription) String() string {
 func (*Subscription) ProtoMessage() {}
 
 func (x *Subscription) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[1]
+	mi := &file_bbgo_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -107,7 +200,7 @@ func (x *Subscription) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Subscription.ProtoReflect.Descriptor instead.
 func (*Subscription) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{1}
+	return file_bbgo_proto_rawDescGZIP(), []int{3}
 }
 
 func (x *Subscription) GetExchange() string {
@@ -153,14 +246,13 @@ type SubscribeResponse struct {
 	Orders       []*Order   `protobuf:"bytes,8,rep,name=orders,proto3" json:"orders,omitempty"`
 	Balances     []*Balance `protobuf:"bytes,9,rep,name=balances,proto3" json:"balances,omitempty"`
 	SubscribedAt int64      `protobuf:"varint,10,opt,name=subscribed_at,json=subscribedAt,proto3" json:"subscribed_at,omitempty"`
-	ErrorCode    int64      `protobuf:"varint,11,opt,name=error_code,json=errorCode,proto3" json:"error_code,omitempty"`
-	ErrorMessage string     `protobuf:"bytes,12,opt,name=error_message,json=errorMessage,proto3" json:"error_message,omitempty"`
+	Error        *Error     `protobuf:"bytes,11,opt,name=error,proto3" json:"error,omitempty"`
 }
 
 func (x *SubscribeResponse) Reset() {
 	*x = SubscribeResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[2]
+		mi := &file_bbgo_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -173,7 +265,7 @@ func (x *SubscribeResponse) String() string {
 func (*SubscribeResponse) ProtoMessage() {}
 
 func (x *SubscribeResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[2]
+	mi := &file_bbgo_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -186,7 +278,7 @@ func (x *SubscribeResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use SubscribeResponse.ProtoReflect.Descriptor instead.
 func (*SubscribeResponse) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{2}
+	return file_bbgo_proto_rawDescGZIP(), []int{4}
 }
 
 func (x *SubscribeResponse) GetExchange() string {
@@ -259,18 +351,11 @@ func (x *SubscribeResponse) GetSubscribedAt() int64 {
 	return 0
 }
 
-func (x *SubscribeResponse) GetErrorCode() int64 {
+func (x *SubscribeResponse) GetError() *Error {
 	if x != nil {
-		return x.ErrorCode
+		return x.Error
 	}
-	return 0
-}
-
-func (x *SubscribeResponse) GetErrorMessage() string {
-	if x != nil {
-		return x.ErrorMessage
-	}
-	return ""
+	return nil
 }
 
 type Depth struct {
@@ -287,7 +372,7 @@ type Depth struct {
 func (x *Depth) Reset() {
 	*x = Depth{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[3]
+		mi := &file_bbgo_proto_msgTypes[5]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -300,7 +385,7 @@ func (x *Depth) String() string {
 func (*Depth) ProtoMessage() {}
 
 func (x *Depth) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[3]
+	mi := &file_bbgo_proto_msgTypes[5]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -313,7 +398,7 @@ func (x *Depth) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Depth.ProtoReflect.Descriptor instead.
 func (*Depth) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{3}
+	return file_bbgo_proto_rawDescGZIP(), []int{5}
 }
 
 func (x *Depth) GetExchange() string {
@@ -356,7 +441,7 @@ type PriceVolume struct {
 func (x *PriceVolume) Reset() {
 	*x = PriceVolume{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[4]
+		mi := &file_bbgo_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -369,7 +454,7 @@ func (x *PriceVolume) String() string {
 func (*PriceVolume) ProtoMessage() {}
 
 func (x *PriceVolume) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[4]
+	mi := &file_bbgo_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -382,7 +467,7 @@ func (x *PriceVolume) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PriceVolume.ProtoReflect.Descriptor instead.
 func (*PriceVolume) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{4}
+	return file_bbgo_proto_rawDescGZIP(), []int{6}
 }
 
 func (x *PriceVolume) GetPrice() int64 {
@@ -422,7 +507,7 @@ type Trade struct {
 func (x *Trade) Reset() {
 	*x = Trade{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[5]
+		mi := &file_bbgo_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -435,7 +520,7 @@ func (x *Trade) String() string {
 func (*Trade) ProtoMessage() {}
 
 func (x *Trade) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[5]
+	mi := &file_bbgo_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -448,7 +533,7 @@ func (x *Trade) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Trade.ProtoReflect.Descriptor instead.
 func (*Trade) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{5}
+	return file_bbgo_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *Trade) GetExchange() string {
@@ -546,7 +631,7 @@ type Ticker struct {
 func (x *Ticker) Reset() {
 	*x = Ticker{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[6]
+		mi := &file_bbgo_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -559,7 +644,7 @@ func (x *Ticker) String() string {
 func (*Ticker) ProtoMessage() {}
 
 func (x *Ticker) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[6]
+	mi := &file_bbgo_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -572,7 +657,7 @@ func (x *Ticker) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Ticker.ProtoReflect.Descriptor instead.
 func (*Ticker) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{6}
+	return file_bbgo_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *Ticker) GetExchange() string {
@@ -650,7 +735,7 @@ type Order struct {
 func (x *Order) Reset() {
 	*x = Order{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[7]
+		mi := &file_bbgo_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -663,7 +748,7 @@ func (x *Order) String() string {
 func (*Order) ProtoMessage() {}
 
 func (x *Order) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[7]
+	mi := &file_bbgo_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -676,7 +761,7 @@ func (x *Order) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Order.ProtoReflect.Descriptor instead.
 func (*Order) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{7}
+	return file_bbgo_proto_rawDescGZIP(), []int{9}
 }
 
 func (x *Order) GetExchange() string {
@@ -803,7 +888,7 @@ type SubmitOrder struct {
 func (x *SubmitOrder) Reset() {
 	*x = SubmitOrder{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[8]
+		mi := &file_bbgo_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -816,7 +901,7 @@ func (x *SubmitOrder) String() string {
 func (*SubmitOrder) ProtoMessage() {}
 
 func (x *SubmitOrder) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[8]
+	mi := &file_bbgo_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -829,7 +914,7 @@ func (x *SubmitOrder) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use SubmitOrder.ProtoReflect.Descriptor instead.
 func (*SubmitOrder) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{8}
+	return file_bbgo_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *SubmitOrder) GetExchange() string {
@@ -911,7 +996,7 @@ type Balance struct {
 func (x *Balance) Reset() {
 	*x = Balance{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[9]
+		mi := &file_bbgo_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -924,7 +1009,7 @@ func (x *Balance) String() string {
 func (*Balance) ProtoMessage() {}
 
 func (x *Balance) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[9]
+	mi := &file_bbgo_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -937,7 +1022,7 @@ func (x *Balance) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Balance.ProtoReflect.Descriptor instead.
 func (*Balance) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{9}
+	return file_bbgo_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *Balance) GetExchange() string {
@@ -986,7 +1071,7 @@ type SubmitOrderRequest struct {
 func (x *SubmitOrderRequest) Reset() {
 	*x = SubmitOrderRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[10]
+		mi := &file_bbgo_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -999,7 +1084,7 @@ func (x *SubmitOrderRequest) String() string {
 func (*SubmitOrderRequest) ProtoMessage() {}
 
 func (x *SubmitOrderRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[10]
+	mi := &file_bbgo_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1012,7 +1097,7 @@ func (x *SubmitOrderRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use SubmitOrderRequest.ProtoReflect.Descriptor instead.
 func (*SubmitOrderRequest) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{10}
+	return file_bbgo_proto_rawDescGZIP(), []int{12}
 }
 
 func (x *SubmitOrderRequest) GetSubmitOrder() *SubmitOrder {
@@ -1027,14 +1112,14 @@ type SubmitOrderResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Exchange string `protobuf:"bytes,1,opt,name=exchange,proto3" json:"exchange,omitempty"`
-	Order    *Order `protobuf:"bytes,2,opt,name=order,proto3" json:"order,omitempty"`
+	Order *Order `protobuf:"bytes,1,opt,name=order,proto3" json:"order,omitempty"`
+	Error *Error `protobuf:"bytes,2,opt,name=error,proto3" json:"error,omitempty"`
 }
 
 func (x *SubmitOrderResponse) Reset() {
 	*x = SubmitOrderResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[11]
+		mi := &file_bbgo_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1047,7 +1132,7 @@ func (x *SubmitOrderResponse) String() string {
 func (*SubmitOrderResponse) ProtoMessage() {}
 
 func (x *SubmitOrderResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[11]
+	mi := &file_bbgo_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1060,14 +1145,7 @@ func (x *SubmitOrderResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use SubmitOrderResponse.ProtoReflect.Descriptor instead.
 func (*SubmitOrderResponse) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{11}
-}
-
-func (x *SubmitOrderResponse) GetExchange() string {
-	if x != nil {
-		return x.Exchange
-	}
-	return ""
+	return file_bbgo_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *SubmitOrderResponse) GetOrder() *Order {
@@ -1077,6 +1155,13 @@ func (x *SubmitOrderResponse) GetOrder() *Order {
 	return nil
 }
 
+func (x *SubmitOrderResponse) GetError() *Error {
+	if x != nil {
+		return x.Error
+	}
+	return nil
+}
+
 type CancelOrderRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1090,7 +1175,7 @@ type CancelOrderRequest struct {
 func (x *CancelOrderRequest) Reset() {
 	*x = CancelOrderRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[12]
+		mi := &file_bbgo_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1103,7 +1188,7 @@ func (x *CancelOrderRequest) String() string {
 func (*CancelOrderRequest) ProtoMessage() {}
 
 func (x *CancelOrderRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[12]
+	mi := &file_bbgo_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1116,7 +1201,7 @@ func (x *CancelOrderRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CancelOrderRequest.ProtoReflect.Descriptor instead.
 func (*CancelOrderRequest) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{12}
+	return file_bbgo_proto_rawDescGZIP(), []int{14}
 }
 
 func (x *CancelOrderRequest) GetExchange() string {
@@ -1145,15 +1230,14 @@ type CancelOrderResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Exchange   string `protobuf:"bytes,1,opt,name=exchange,proto3" json:"exchange,omitempty"`
-	Order      *Order `protobuf:"bytes,2,opt,name=order,proto3" json:"order,omitempty"`
-	StatusCode int64  `protobuf:"varint,3,opt,name=status_code,json=statusCode,proto3" json:"status_code,omitempty"`
+	Order *Order `protobuf:"bytes,1,opt,name=order,proto3" json:"order,omitempty"`
+	Error *Error `protobuf:"bytes,2,opt,name=error,proto3" json:"error,omitempty"`
 }
 
 func (x *CancelOrderResponse) Reset() {
 	*x = CancelOrderResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[13]
+		mi := &file_bbgo_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1166,7 +1250,7 @@ func (x *CancelOrderResponse) String() string {
 func (*CancelOrderResponse) ProtoMessage() {}
 
 func (x *CancelOrderResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[13]
+	mi := &file_bbgo_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1179,14 +1263,7 @@ func (x *CancelOrderResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use CancelOrderResponse.ProtoReflect.Descriptor instead.
 func (*CancelOrderResponse) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{13}
-}
-
-func (x *CancelOrderResponse) GetExchange() string {
-	if x != nil {
-		return x.Exchange
-	}
-	return ""
+	return file_bbgo_proto_rawDescGZIP(), []int{15}
 }
 
 func (x *CancelOrderResponse) GetOrder() *Order {
@@ -1196,11 +1273,11 @@ func (x *CancelOrderResponse) GetOrder() *Order {
 	return nil
 }
 
-func (x *CancelOrderResponse) GetStatusCode() int64 {
+func (x *CancelOrderResponse) GetError() *Error {
 	if x != nil {
-		return x.StatusCode
+		return x.Error
 	}
-	return 0
+	return nil
 }
 
 type QueryOrderRequest struct {
@@ -1215,7 +1292,7 @@ type QueryOrderRequest struct {
 func (x *QueryOrderRequest) Reset() {
 	*x = QueryOrderRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[14]
+		mi := &file_bbgo_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1228,7 +1305,7 @@ func (x *QueryOrderRequest) String() string {
 func (*QueryOrderRequest) ProtoMessage() {}
 
 func (x *QueryOrderRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[14]
+	mi := &file_bbgo_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1241,7 +1318,7 @@ func (x *QueryOrderRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use QueryOrderRequest.ProtoReflect.Descriptor instead.
 func (*QueryOrderRequest) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{14}
+	return file_bbgo_proto_rawDescGZIP(), []int{16}
 }
 
 func (x *QueryOrderRequest) GetId() int64 {
@@ -1263,14 +1340,14 @@ type QueryOrderResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Order      *Order `protobuf:"bytes,1,opt,name=order,proto3" json:"order,omitempty"`
-	StatusCode int64  `protobuf:"varint,2,opt,name=status_code,json=statusCode,proto3" json:"status_code,omitempty"`
+	Order *Order `protobuf:"bytes,1,opt,name=order,proto3" json:"order,omitempty"`
+	Error *Error `protobuf:"bytes,2,opt,name=error,proto3" json:"error,omitempty"`
 }
 
 func (x *QueryOrderResponse) Reset() {
 	*x = QueryOrderResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[15]
+		mi := &file_bbgo_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1283,7 +1360,7 @@ func (x *QueryOrderResponse) String() string {
 func (*QueryOrderResponse) ProtoMessage() {}
 
 func (x *QueryOrderResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[15]
+	mi := &file_bbgo_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1296,7 +1373,7 @@ func (x *QueryOrderResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use QueryOrderResponse.ProtoReflect.Descriptor instead.
 func (*QueryOrderResponse) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{15}
+	return file_bbgo_proto_rawDescGZIP(), []int{17}
 }
 
 func (x *QueryOrderResponse) GetOrder() *Order {
@@ -1306,11 +1383,11 @@ func (x *QueryOrderResponse) GetOrder() *Order {
 	return nil
 }
 
-func (x *QueryOrderResponse) GetStatusCode() int64 {
+func (x *QueryOrderResponse) GetError() *Error {
 	if x != nil {
-		return x.StatusCode
+		return x.Error
 	}
-	return 0
+	return nil
 }
 
 type QueryOrdersRequest struct {
@@ -1332,7 +1409,7 @@ type QueryOrdersRequest struct {
 func (x *QueryOrdersRequest) Reset() {
 	*x = QueryOrdersRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[16]
+		mi := &file_bbgo_proto_msgTypes[18]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1345,7 +1422,7 @@ func (x *QueryOrdersRequest) String() string {
 func (*QueryOrdersRequest) ProtoMessage() {}
 
 func (x *QueryOrdersRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[16]
+	mi := &file_bbgo_proto_msgTypes[18]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1358,7 +1435,7 @@ func (x *QueryOrdersRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use QueryOrdersRequest.ProtoReflect.Descriptor instead.
 func (*QueryOrdersRequest) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{16}
+	return file_bbgo_proto_rawDescGZIP(), []int{18}
 }
 
 func (x *QueryOrdersRequest) GetExchange() string {
@@ -1429,15 +1506,14 @@ type QueryOrdersResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Exchange   string   `protobuf:"bytes,1,opt,name=exchange,proto3" json:"exchange,omitempty"`
-	Orders     []*Order `protobuf:"bytes,2,rep,name=orders,proto3" json:"orders,omitempty"`
-	StatusCode int64    `protobuf:"varint,3,opt,name=status_code,json=statusCode,proto3" json:"status_code,omitempty"`
+	Orders []*Order `protobuf:"bytes,1,rep,name=orders,proto3" json:"orders,omitempty"`
+	Error  *Error   `protobuf:"bytes,2,opt,name=error,proto3" json:"error,omitempty"`
 }
 
 func (x *QueryOrdersResponse) Reset() {
 	*x = QueryOrdersResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[17]
+		mi := &file_bbgo_proto_msgTypes[19]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1450,7 +1526,7 @@ func (x *QueryOrdersResponse) String() string {
 func (*QueryOrdersResponse) ProtoMessage() {}
 
 func (x *QueryOrdersResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[17]
+	mi := &file_bbgo_proto_msgTypes[19]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1463,14 +1539,7 @@ func (x *QueryOrdersResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use QueryOrdersResponse.ProtoReflect.Descriptor instead.
 func (*QueryOrdersResponse) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{17}
-}
-
-func (x *QueryOrdersResponse) GetExchange() string {
-	if x != nil {
-		return x.Exchange
-	}
-	return ""
+	return file_bbgo_proto_rawDescGZIP(), []int{19}
 }
 
 func (x *QueryOrdersResponse) GetOrders() []*Order {
@@ -1480,11 +1549,11 @@ func (x *QueryOrdersResponse) GetOrders() []*Order {
 	return nil
 }
 
-func (x *QueryOrdersResponse) GetStatusCode() int64 {
+func (x *QueryOrdersResponse) GetError() *Error {
 	if x != nil {
-		return x.StatusCode
+		return x.Error
 	}
-	return 0
+	return nil
 }
 
 type QueryTradesRequest struct {
@@ -1507,7 +1576,7 @@ type QueryTradesRequest struct {
 func (x *QueryTradesRequest) Reset() {
 	*x = QueryTradesRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[18]
+		mi := &file_bbgo_proto_msgTypes[20]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1520,7 +1589,7 @@ func (x *QueryTradesRequest) String() string {
 func (*QueryTradesRequest) ProtoMessage() {}
 
 func (x *QueryTradesRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[18]
+	mi := &file_bbgo_proto_msgTypes[20]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1533,7 +1602,7 @@ func (x *QueryTradesRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use QueryTradesRequest.ProtoReflect.Descriptor instead.
 func (*QueryTradesRequest) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{18}
+	return file_bbgo_proto_rawDescGZIP(), []int{20}
 }
 
 func (x *QueryTradesRequest) GetExchange() string {
@@ -1611,14 +1680,14 @@ type QueryTradesResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Trades     []*Trade `protobuf:"bytes,1,rep,name=trades,proto3" json:"trades,omitempty"`
-	StatusCode int64    `protobuf:"varint,2,opt,name=status_code,json=statusCode,proto3" json:"status_code,omitempty"`
+	Trades []*Trade `protobuf:"bytes,1,rep,name=trades,proto3" json:"trades,omitempty"`
+	Error  *Error   `protobuf:"bytes,2,opt,name=error,proto3" json:"error,omitempty"`
 }
 
 func (x *QueryTradesResponse) Reset() {
 	*x = QueryTradesResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[19]
+		mi := &file_bbgo_proto_msgTypes[21]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1631,7 +1700,7 @@ func (x *QueryTradesResponse) String() string {
 func (*QueryTradesResponse) ProtoMessage() {}
 
 func (x *QueryTradesResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[19]
+	mi := &file_bbgo_proto_msgTypes[21]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1644,7 +1713,7 @@ func (x *QueryTradesResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use QueryTradesResponse.ProtoReflect.Descriptor instead.
 func (*QueryTradesResponse) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{19}
+	return file_bbgo_proto_rawDescGZIP(), []int{21}
 }
 
 func (x *QueryTradesResponse) GetTrades() []*Trade {
@@ -1654,11 +1723,11 @@ func (x *QueryTradesResponse) GetTrades() []*Trade {
 	return nil
 }
 
-func (x *QueryTradesResponse) GetStatusCode() int64 {
+func (x *QueryTradesResponse) GetError() *Error {
 	if x != nil {
-		return x.StatusCode
+		return x.Error
 	}
-	return 0
+	return nil
 }
 
 type QueryKLinesRequest struct {
@@ -1676,7 +1745,7 @@ type QueryKLinesRequest struct {
 func (x *QueryKLinesRequest) Reset() {
 	*x = QueryKLinesRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[20]
+		mi := &file_bbgo_proto_msgTypes[22]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1689,7 +1758,7 @@ func (x *QueryKLinesRequest) String() string {
 func (*QueryKLinesRequest) ProtoMessage() {}
 
 func (x *QueryKLinesRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[20]
+	mi := &file_bbgo_proto_msgTypes[22]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1702,7 +1771,7 @@ func (x *QueryKLinesRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use QueryKLinesRequest.ProtoReflect.Descriptor instead.
 func (*QueryKLinesRequest) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{20}
+	return file_bbgo_proto_rawDescGZIP(), []int{22}
 }
 
 func (x *QueryKLinesRequest) GetExchange() string {
@@ -1745,14 +1814,14 @@ type QueryKLinesResponse struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Klines     []*KLine `protobuf:"bytes,1,rep,name=klines,proto3" json:"klines,omitempty"`
-	StatusCode int64    `protobuf:"varint,2,opt,name=status_code,json=statusCode,proto3" json:"status_code,omitempty"`
+	Klines []*KLine `protobuf:"bytes,1,rep,name=klines,proto3" json:"klines,omitempty"`
+	Error  *Error   `protobuf:"bytes,2,opt,name=error,proto3" json:"error,omitempty"`
 }
 
 func (x *QueryKLinesResponse) Reset() {
 	*x = QueryKLinesResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[21]
+		mi := &file_bbgo_proto_msgTypes[23]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1765,7 +1834,7 @@ func (x *QueryKLinesResponse) String() string {
 func (*QueryKLinesResponse) ProtoMessage() {}
 
 func (x *QueryKLinesResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[21]
+	mi := &file_bbgo_proto_msgTypes[23]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1778,7 +1847,7 @@ func (x *QueryKLinesResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use QueryKLinesResponse.ProtoReflect.Descriptor instead.
 func (*QueryKLinesResponse) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{21}
+	return file_bbgo_proto_rawDescGZIP(), []int{23}
 }
 
 func (x *QueryKLinesResponse) GetKlines() []*KLine {
@@ -1788,11 +1857,11 @@ func (x *QueryKLinesResponse) GetKlines() []*KLine {
 	return nil
 }
 
-func (x *QueryKLinesResponse) GetStatusCode() int64 {
+func (x *QueryKLinesResponse) GetError() *Error {
 	if x != nil {
-		return x.StatusCode
+		return x.Error
 	}
-	return 0
+	return nil
 }
 
 type KLine struct {
@@ -1814,7 +1883,7 @@ type KLine struct {
 func (x *KLine) Reset() {
 	*x = KLine{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_bbgo_proto_msgTypes[22]
+		mi := &file_bbgo_proto_msgTypes[24]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1827,7 +1896,7 @@ func (x *KLine) String() string {
 func (*KLine) ProtoMessage() {}
 
 func (x *KLine) ProtoReflect() protoreflect.Message {
-	mi := &file_bbgo_proto_msgTypes[22]
+	mi := &file_bbgo_proto_msgTypes[24]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1840,7 +1909,7 @@ func (x *KLine) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use KLine.ProtoReflect.Descriptor instead.
 func (*KLine) Descriptor() ([]byte, []int) {
-	return file_bbgo_proto_rawDescGZIP(), []int{22}
+	return file_bbgo_proto_rawDescGZIP(), []int{24}
 }
 
 func (x *KLine) GetExchange() string {
@@ -1910,194 +1979,194 @@ var File_bbgo_proto protoreflect.FileDescriptor
 
 var file_bbgo_proto_rawDesc = []byte{
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 }
 
 var (
@@ -2194,67 +2267,78 @@ func file_bbgo_proto_rawDescGZIP() []byte {
 	return file_bbgo_proto_rawDescData
 }
 
-var file_bbgo_proto_msgTypes = make([]protoimpl.MessageInfo, 23)
+var file_bbgo_proto_msgTypes = make([]protoimpl.MessageInfo, 25)
 var file_bbgo_proto_goTypes = []interface{}{
-	(*SubscribeRequest)(nil),    // 0: pb.SubscribeRequest
-	(*Subscription)(nil),        // 1: pb.Subscription
-	(*SubscribeResponse)(nil),   // 2: pb.SubscribeResponse
-	(*Depth)(nil),               // 3: pb.Depth
-	(*PriceVolume)(nil),         // 4: pb.PriceVolume
-	(*Trade)(nil),               // 5: pb.Trade
-	(*Ticker)(nil),              // 6: pb.Ticker
-	(*Order)(nil),               // 7: pb.Order
-	(*SubmitOrder)(nil),         // 8: pb.SubmitOrder
-	(*Balance)(nil),             // 9: pb.Balance
-	(*SubmitOrderRequest)(nil),  // 10: pb.SubmitOrderRequest
-	(*SubmitOrderResponse)(nil), // 11: pb.SubmitOrderResponse
-	(*CancelOrderRequest)(nil),  // 12: pb.CancelOrderRequest
-	(*CancelOrderResponse)(nil), // 13: pb.CancelOrderResponse
-	(*QueryOrderRequest)(nil),   // 14: pb.QueryOrderRequest
-	(*QueryOrderResponse)(nil),  // 15: pb.QueryOrderResponse
-	(*QueryOrdersRequest)(nil),  // 16: pb.QueryOrdersRequest
-	(*QueryOrdersResponse)(nil), // 17: pb.QueryOrdersResponse
-	(*QueryTradesRequest)(nil),  // 18: pb.QueryTradesRequest
-	(*QueryTradesResponse)(nil), // 19: pb.QueryTradesResponse
-	(*QueryKLinesRequest)(nil),  // 20: pb.QueryKLinesRequest
-	(*QueryKLinesResponse)(nil), // 21: pb.QueryKLinesResponse
-	(*KLine)(nil),               // 22: pb.KLine
+	(*Empty)(nil),               // 0: pb.Empty
+	(*Error)(nil),               // 1: pb.Error
+	(*SubscribeRequest)(nil),    // 2: pb.SubscribeRequest
+	(*Subscription)(nil),        // 3: pb.Subscription
+	(*SubscribeResponse)(nil),   // 4: pb.SubscribeResponse
+	(*Depth)(nil),               // 5: pb.Depth
+	(*PriceVolume)(nil),         // 6: pb.PriceVolume
+	(*Trade)(nil),               // 7: pb.Trade
+	(*Ticker)(nil),              // 8: pb.Ticker
+	(*Order)(nil),               // 9: pb.Order
+	(*SubmitOrder)(nil),         // 10: pb.SubmitOrder
+	(*Balance)(nil),             // 11: pb.Balance
+	(*SubmitOrderRequest)(nil),  // 12: pb.SubmitOrderRequest
+	(*SubmitOrderResponse)(nil), // 13: pb.SubmitOrderResponse
+	(*CancelOrderRequest)(nil),  // 14: pb.CancelOrderRequest
+	(*CancelOrderResponse)(nil), // 15: pb.CancelOrderResponse
+	(*QueryOrderRequest)(nil),   // 16: pb.QueryOrderRequest
+	(*QueryOrderResponse)(nil),  // 17: pb.QueryOrderResponse
+	(*QueryOrdersRequest)(nil),  // 18: pb.QueryOrdersRequest
+	(*QueryOrdersResponse)(nil), // 19: pb.QueryOrdersResponse
+	(*QueryTradesRequest)(nil),  // 20: pb.QueryTradesRequest
+	(*QueryTradesResponse)(nil), // 21: pb.QueryTradesResponse
+	(*QueryKLinesRequest)(nil),  // 22: pb.QueryKLinesRequest
+	(*QueryKLinesResponse)(nil), // 23: pb.QueryKLinesResponse
+	(*KLine)(nil),               // 24: pb.KLine
 }
 var file_bbgo_proto_depIdxs = []int32{
-	1,  // 0: pb.SubscribeRequest.subscriptions:type_name -> pb.Subscription
-	3,  // 1: pb.SubscribeResponse.depth:type_name -> pb.Depth
-	5,  // 2: pb.SubscribeResponse.trades:type_name -> pb.Trade
-	6,  // 3: pb.SubscribeResponse.ticker:type_name -> pb.Ticker
-	7,  // 4: pb.SubscribeResponse.orders:type_name -> pb.Order
-	9,  // 5: pb.SubscribeResponse.balances:type_name -> pb.Balance
-	4,  // 6: pb.Depth.asks:type_name -> pb.PriceVolume
-	4,  // 7: pb.Depth.bids:type_name -> pb.PriceVolume
-	8,  // 8: pb.SubmitOrderRequest.submit_order:type_name -> pb.SubmitOrder
-	7,  // 9: pb.SubmitOrderResponse.order:type_name -> pb.Order
-	7,  // 10: pb.CancelOrderResponse.order:type_name -> pb.Order
-	7,  // 11: pb.QueryOrderResponse.order:type_name -> pb.Order
-	7,  // 12: pb.QueryOrdersResponse.orders:type_name -> pb.Order
-	5,  // 13: pb.QueryTradesResponse.trades:type_name -> pb.Trade
-	22, // 14: pb.QueryKLinesResponse.klines:type_name -> pb.KLine
-	0,  // 15: pb.BBGO.Subcribe:input_type -> pb.SubscribeRequest
-	10, // 16: pb.BBGO.SubmitOrder:input_type -> pb.SubmitOrderRequest
-	12, // 17: pb.BBGO.CancelOrder:input_type -> pb.CancelOrderRequest
-	14, // 18: pb.BBGO.QueryOrder:input_type -> pb.QueryOrderRequest
-	16, // 19: pb.BBGO.QueryOrders:input_type -> pb.QueryOrdersRequest
-	18, // 20: pb.BBGO.QueryTrades:input_type -> pb.QueryTradesRequest
-	20, // 21: pb.BBGO.QueryKLines:input_type -> pb.QueryKLinesRequest
-	2,  // 22: pb.BBGO.Subcribe:output_type -> pb.SubscribeResponse
-	11, // 23: pb.BBGO.SubmitOrder:output_type -> pb.SubmitOrderResponse
-	13, // 24: pb.BBGO.CancelOrder:output_type -> pb.CancelOrderResponse
-	15, // 25: pb.BBGO.QueryOrder:output_type -> pb.QueryOrderResponse
-	17, // 26: pb.BBGO.QueryOrders:output_type -> pb.QueryOrdersResponse
-	19, // 27: pb.BBGO.QueryTrades:output_type -> pb.QueryTradesResponse
-	21, // 28: pb.BBGO.QueryKLines:output_type -> pb.QueryKLinesResponse
-	22, // [22:29] is the sub-list for method output_type
-	15, // [15:22] is the sub-list for method input_type
-	15, // [15:15] is the sub-list for extension type_name
-	15, // [15:15] is the sub-list for extension extendee
-	0,  // [0:15] is the sub-list for field type_name
+	3,  // 0: pb.SubscribeRequest.subscriptions:type_name -> pb.Subscription
+	5,  // 1: pb.SubscribeResponse.depth:type_name -> pb.Depth
+	7,  // 2: pb.SubscribeResponse.trades:type_name -> pb.Trade
+	8,  // 3: pb.SubscribeResponse.ticker:type_name -> pb.Ticker
+	9,  // 4: pb.SubscribeResponse.orders:type_name -> pb.Order
+	11, // 5: pb.SubscribeResponse.balances:type_name -> pb.Balance
+	1,  // 6: pb.SubscribeResponse.error:type_name -> pb.Error
+	6,  // 7: pb.Depth.asks:type_name -> pb.PriceVolume
+	6,  // 8: pb.Depth.bids:type_name -> pb.PriceVolume
+	10, // 9: pb.SubmitOrderRequest.submit_order:type_name -> pb.SubmitOrder
+	9,  // 10: pb.SubmitOrderResponse.order:type_name -> pb.Order
+	1,  // 11: pb.SubmitOrderResponse.error:type_name -> pb.Error
+	9,  // 12: pb.CancelOrderResponse.order:type_name -> pb.Order
+	1,  // 13: pb.CancelOrderResponse.error:type_name -> pb.Error
+	9,  // 14: pb.QueryOrderResponse.order:type_name -> pb.Order
+	1,  // 15: pb.QueryOrderResponse.error:type_name -> pb.Error
+	9,  // 16: pb.QueryOrdersResponse.orders:type_name -> pb.Order
+	1,  // 17: pb.QueryOrdersResponse.error:type_name -> pb.Error
+	7,  // 18: pb.QueryTradesResponse.trades:type_name -> pb.Trade
+	1,  // 19: pb.QueryTradesResponse.error:type_name -> pb.Error
+	24, // 20: pb.QueryKLinesResponse.klines:type_name -> pb.KLine
+	1,  // 21: pb.QueryKLinesResponse.error:type_name -> pb.Error
+	2,  // 22: pb.BBGO.Subcribe:input_type -> pb.SubscribeRequest
+	0,  // 23: pb.BBGO.SubcribeUserData:input_type -> pb.Empty
+	12, // 24: pb.BBGO.SubmitOrder:input_type -> pb.SubmitOrderRequest
+	14, // 25: pb.BBGO.CancelOrder:input_type -> pb.CancelOrderRequest
+	16, // 26: pb.BBGO.QueryOrder:input_type -> pb.QueryOrderRequest
+	18, // 27: pb.BBGO.QueryOrders:input_type -> pb.QueryOrdersRequest
+	20, // 28: pb.BBGO.QueryTrades:input_type -> pb.QueryTradesRequest
+	22, // 29: pb.BBGO.QueryKLines:input_type -> pb.QueryKLinesRequest
+	4,  // 30: pb.BBGO.Subcribe:output_type -> pb.SubscribeResponse
+	4,  // 31: pb.BBGO.SubcribeUserData:output_type -> pb.SubscribeResponse
+	13, // 32: pb.BBGO.SubmitOrder:output_type -> pb.SubmitOrderResponse
+	15, // 33: pb.BBGO.CancelOrder:output_type -> pb.CancelOrderResponse
+	17, // 34: pb.BBGO.QueryOrder:output_type -> pb.QueryOrderResponse
+	19, // 35: pb.BBGO.QueryOrders:output_type -> pb.QueryOrdersResponse
+	21, // 36: pb.BBGO.QueryTrades:output_type -> pb.QueryTradesResponse
+	23, // 37: pb.BBGO.QueryKLines:output_type -> pb.QueryKLinesResponse
+	30, // [30:38] is the sub-list for method output_type
+	22, // [22:30] is the sub-list for method input_type
+	22, // [22:22] is the sub-list for extension type_name
+	22, // [22:22] is the sub-list for extension extendee
+	0,  // [0:22] is the sub-list for field type_name
 }
 
 func init() { file_bbgo_proto_init() }
@@ -2264,7 +2348,7 @@ func file_bbgo_proto_init() {
 	}
 	if !protoimpl.UnsafeEnabled {
 		file_bbgo_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubscribeRequest); i {
+			switch v := v.(*Empty); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2276,7 +2360,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Subscription); i {
+			switch v := v.(*Error); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2288,7 +2372,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubscribeResponse); i {
+			switch v := v.(*SubscribeRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2300,7 +2384,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Depth); i {
+			switch v := v.(*Subscription); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2312,7 +2396,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PriceVolume); i {
+			switch v := v.(*SubscribeResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2324,7 +2408,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Trade); i {
+			switch v := v.(*Depth); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2336,7 +2420,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Ticker); i {
+			switch v := v.(*PriceVolume); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2348,7 +2432,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Order); i {
+			switch v := v.(*Trade); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2360,7 +2444,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubmitOrder); i {
+			switch v := v.(*Ticker); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2372,7 +2456,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Balance); i {
+			switch v := v.(*Order); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2384,7 +2468,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubmitOrderRequest); i {
+			switch v := v.(*SubmitOrder); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2396,7 +2480,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SubmitOrderResponse); i {
+			switch v := v.(*Balance); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2408,7 +2492,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CancelOrderRequest); i {
+			switch v := v.(*SubmitOrderRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2420,7 +2504,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CancelOrderResponse); i {
+			switch v := v.(*SubmitOrderResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2432,7 +2516,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryOrderRequest); i {
+			switch v := v.(*CancelOrderRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2444,7 +2528,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryOrderResponse); i {
+			switch v := v.(*CancelOrderResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2456,7 +2540,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryOrdersRequest); i {
+			switch v := v.(*QueryOrderRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2468,7 +2552,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryOrdersResponse); i {
+			switch v := v.(*QueryOrderResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2480,7 +2564,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryTradesRequest); i {
+			switch v := v.(*QueryOrdersRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2492,7 +2576,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryTradesResponse); i {
+			switch v := v.(*QueryOrdersResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2504,7 +2588,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryKLinesRequest); i {
+			switch v := v.(*QueryTradesRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2516,7 +2600,7 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[21].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*QueryKLinesResponse); i {
+			switch v := v.(*QueryTradesResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2528,6 +2612,30 @@ func file_bbgo_proto_init() {
 			}
 		}
 		file_bbgo_proto_msgTypes[22].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*QueryKLinesRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_bbgo_proto_msgTypes[23].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*QueryKLinesResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_bbgo_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*KLine); i {
 			case 0:
 				return &v.state
@@ -2546,7 +2654,7 @@ func file_bbgo_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_bbgo_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   23,
+			NumMessages:   25,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/pkg/pb/bbgo.proto b/pkg/pb/bbgo.proto
index f12cb8bb0..84175fae5 100644
--- a/pkg/pb/bbgo.proto
+++ b/pkg/pb/bbgo.proto
@@ -20,6 +20,11 @@ service BBGO {
 
 message Empty {}
 
+message Error {
+    int64 error_code = 1;
+    string error_message = 2;
+}
+
 message SubscribeRequest {
     repeated Subscription subscriptions = 1;
 }
@@ -42,8 +47,7 @@ message SubscribeResponse {
     repeated Order orders = 8;
     repeated Balance balances = 9;
     int64 subscribed_at = 10;
-    int64 error_code = 11;
-    string error_message = 12;
+    Error error = 11;
 }
 
 message Depth {
@@ -130,8 +134,8 @@ message SubmitOrderRequest {
 }
 
 message SubmitOrderResponse {
-    string exchange = 1;
-    Order order = 2;
+    Order order = 1;
+    Error error = 2;
 }
 
 message CancelOrderRequest {
@@ -141,9 +145,8 @@ message CancelOrderRequest {
 }
 
 message CancelOrderResponse {
-    string exchange = 1;
-    Order order = 2;
-    int64 status_code = 3;
+    Order order = 1;
+    Error error = 2;
 }
 
 message QueryOrderRequest {
@@ -153,7 +156,7 @@ message QueryOrderRequest {
 
 message QueryOrderResponse {
     Order order = 1;
-    int64 status_code = 2;
+    Error error = 2;
 }
 
 message QueryOrdersRequest {
@@ -169,9 +172,8 @@ message QueryOrdersRequest {
 }
 
 message QueryOrdersResponse {
-    string exchange = 1;
-    repeated Order orders = 2;
-    int64 status_code = 3;
+    repeated Order orders = 1;
+    Error error = 2;
 }
 
 message QueryTradesRequest {
@@ -189,7 +191,7 @@ message QueryTradesRequest {
 
 message QueryTradesResponse {
     repeated Trade trades = 1;
-    int64 status_code = 2;
+    Error error = 2;
 }
 
 message QueryKLinesRequest {
@@ -202,7 +204,7 @@ message QueryKLinesRequest {
 
 message QueryKLinesResponse {
     repeated KLine klines = 1;
-    int64 status_code = 2;
+    Error error = 2;
 }
 
 message KLine {