diff --git a/meter/handler/handler.go b/meter/handler/handler.go
index 4bff85fa..681a239c 100644
--- a/meter/handler/handler.go
+++ b/meter/handler/handler.go
@@ -24,7 +24,7 @@ func NewHandler(meter meter.Meter, opts ...meter.Option) *handler {
 	return &handler{meter: meter, opts: opts}
 }
 
-func (h *handler) Metrics(ctx context.Context, req *Empty, rsp *codec.Frame) error {
+func (h *handler) Metrics(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
 	buf := bytes.NewBuffer(nil)
 	if err := h.meter.Write(buf, h.opts...); err != nil {
 		return err
diff --git a/meter/handler/handler.proto b/meter/handler/handler.proto
index 54e8a44b..eeee2e4b 100644
--- a/meter/handler/handler.proto
+++ b/meter/handler/handler.proto
@@ -8,7 +8,7 @@ import "openapiv2/annotations.proto";
 import "codec/frame.proto";
 
 service Meter {
-	rpc Metrics(Empty) returns (micro.codec.Frame) {
+	rpc Metrics(micro.codec.Frame) returns (micro.codec.Frame) {
 		option (micro.openapiv2.openapiv2_operation) = {
       operation_id: "Metrics";
         responses: {
@@ -26,5 +26,3 @@ service Meter {
 		option (micro.api.http) = { get: "/metrics"; };
   };
 };
-
-message Empty{};
diff --git a/meter/handler/handler_micro.pb.go b/meter/handler/handler_micro.pb.go
index 38edd8e6..a3bb9400 100644
--- a/meter/handler/handler_micro.pb.go
+++ b/meter/handler/handler_micro.pb.go
@@ -20,5 +20,5 @@ func NewMeterEndpoints() []*api.Endpoint {
 }
 
 type MeterServer interface {
-	Metrics(ctx context.Context, req *Empty, rsp *codec.Frame) error
+	Metrics(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error
 }
diff --git a/meter/handler/handler_micro_http.pb.go b/meter/handler/handler_micro_http.pb.go
index 6497b0da..a82a198a 100644
--- a/meter/handler/handler_micro_http.pb.go
+++ b/meter/handler/handler_micro_http.pb.go
@@ -13,13 +13,13 @@ type meterServer struct {
 	MeterServer
 }
 
-func (h *meterServer) Metrics(ctx context.Context, req *Empty, rsp *codec.Frame) error {
+func (h *meterServer) Metrics(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
 	return h.MeterServer.Metrics(ctx, req, rsp)
 }
 
 func RegisterMeterServer(s server.Server, sh MeterServer, opts ...server.HandlerOption) error {
 	type meter interface {
-		Metrics(ctx context.Context, req *Empty, rsp *codec.Frame) error
+		Metrics(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error
 	}
 	type Meter struct {
 		meter