diff --git a/api/v1/service/service_end.go b/api/v1/service/service_end.go
index 23abbc7..2a1b777 100644
--- a/api/v1/service/service_end.go
+++ b/api/v1/service/service_end.go
@@ -6,7 +6,7 @@ import (
 	"encoding/json"
 	"strconv"
 
-	"github.com/singchia/frontier/pkg/proto"
+	"github.com/singchia/frontier/pkg/api"
 	"github.com/singchia/geminio"
 	"github.com/singchia/geminio/client"
 	"github.com/singchia/geminio/options"
@@ -32,7 +32,7 @@ func newServiceEnd(dialer client.Dialer, opts ...ServiceOption) (*serviceEnd, er
 		sopts.SetLog(sopt.logger)
 	}
 	// meta
-	meta := &proto.Meta{}
+	meta := &api.Meta{}
 	if sopt.topics != nil {
 		// we deliver topics in meta
 		meta.Topics = sopt.topics
@@ -74,7 +74,7 @@ func (service *serviceEnd) RegisterGetEdgeID(ctx context.Context, getEdgeID GetE
 
 func (service *serviceEnd) RegisterEdgeOnline(ctx context.Context, edgeOnline EdgeOnline) error {
 	return service.End.Register(ctx, "edge_online", func(ctx context.Context, req geminio.Request, rsp geminio.Response) {
-		on := &proto.OnEdgeOnline{}
+		on := &api.OnEdgeOnline{}
 		err := json.Unmarshal(req.Data(), on)
 		if err != nil {
 			// shouldn't be here
@@ -92,7 +92,7 @@ func (service *serviceEnd) RegisterEdgeOnline(ctx context.Context, edgeOnline Ed
 
 func (service *serviceEnd) RegisterEdgeOffline(ctx context.Context, edgeOffline EdgeOffline) error {
 	return service.End.Register(ctx, "edge_offline", func(ctx context.Context, req geminio.Request, rsp geminio.Response) {
-		off := &proto.OnEdgeOffline{}
+		off := &api.OnEdgeOffline{}
 		err := json.Unmarshal(req.Data(), off)
 		if err != nil {
 			// shouldn't be here
diff --git a/pkg/api/error.go b/pkg/api/error.go
new file mode 100644
index 0000000..453e780
--- /dev/null
+++ b/pkg/api/error.go
@@ -0,0 +1,7 @@
+package api
+
+import "errors"
+
+var (
+	ErrEdgeNotOnline = errors.New("edge not online")
+)
diff --git a/pkg/api/interface.go b/pkg/api/interface.go
new file mode 100644
index 0000000..e75cba4
--- /dev/null
+++ b/pkg/api/interface.go
@@ -0,0 +1,46 @@
+package api
+
+import (
+	"net"
+
+	"github.com/singchia/geminio"
+)
+
+type Exchange interface {
+	// rpc, message and raw io to edge
+	ForwardToEdge(*Meta, geminio.End)
+	// stream to edge
+	StreamToEdge(geminio.Stream)
+	// rpc, message and raw io to service
+	ForwardToService(geminio.End)
+	// stream to service
+	StreamToService(geminio.Stream)
+}
+
+// edge related
+type Edgebound interface {
+	ListEdges() []geminio.End
+	// for management
+	GetEdgeByID(edgeID uint64) geminio.End
+	DelEdgeByID(edgeID uint64) error
+}
+
+type EdgeInformer interface {
+	EdgeOnline(edgeID uint64, meta []byte, addr net.Addr)
+	EdgeOffline(edgeID uint64, meta []byte, addr net.Addr)
+	EdgeHeartbeat(edgeID uint64, meta []byte, addr net.Addr)
+}
+
+// service related
+type Servicebound interface {
+	ListService() []geminio.End
+	// for management
+	GetService(service string) geminio.End
+	DelSerivces(service string) error
+}
+
+type ServiceInformer interface {
+	ServiceOnline(serviceID uint64, service string, addr net.Addr)
+	ServiceOffline(serviceID uint64, service string, addr net.Addr)
+	ServiceHeartbeat(serviceID uint64, service string, addr net.Addr)
+}
diff --git a/pkg/proto/proto.go b/pkg/api/proto.go
similarity index 97%
rename from pkg/proto/proto.go
rename to pkg/api/proto.go
index bc29909..e1f696f 100644
--- a/pkg/proto/proto.go
+++ b/pkg/api/proto.go
@@ -1,4 +1,4 @@
-package proto
+package api
 
 // frontier -> service
 type OnEdgeOnline struct {
diff --git a/pkg/edgebound/edge_manager.go b/pkg/edgebound/edge_manager.go
index ae378ba..178641a 100644
--- a/pkg/edgebound/edge_manager.go
+++ b/pkg/edgebound/edge_manager.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/jumboframes/armorigo/rproxy"
 	"github.com/jumboframes/armorigo/synchub"
+	"github.com/singchia/frontier/pkg/api"
 	"github.com/singchia/frontier/pkg/config"
 	"github.com/singchia/frontier/pkg/mapmap"
 	"github.com/singchia/frontier/pkg/repo/dao"
@@ -24,31 +25,11 @@ import (
 	"k8s.io/klog/v2"
 )
 
-type Edgebound interface {
-	ListEdges() []geminio.End
-	// for management
-	GetEdgeByID(edgeID uint64) geminio.End
-	DelEdgeByID(edgeID uint64) error
-}
-
-type EdgeInformer interface {
-	EdgeOnline(edgeID uint64, meta []byte, addr net.Addr)
-	EdgeOffline(edgeID uint64, meta []byte, addr net.Addr)
-	EdgeHeartbeat(edgeID uint64, meta []byte, addr net.Addr)
-}
-
-type Exchange interface {
-	// rpc, message and raw io to service
-	ForwardToService(geminio.End)
-	// stream to service
-	StreamToService(geminio.Stream)
-}
-
 type edgeManager struct {
 	*delegate.UnimplementedDelegate
 
-	informer EdgeInformer
-	exchange Exchange
+	informer api.EdgeInformer
+	exchange api.Exchange
 	conf     *config.Configuration
 	// edgeID allocator
 	idFactory id.IDFactory
@@ -74,8 +55,8 @@ type edgeManager struct {
 }
 
 // support for tls, mtls and tcp listening
-func newEdgeManager(conf *config.Configuration, dao *dao.Dao, informer EdgeInformer,
-	exchange Exchange, tmr timer.Timer) (*edgeManager, error) {
+func newEdgeManager(conf *config.Configuration, dao *dao.Dao, informer api.EdgeInformer,
+	exchange api.Exchange, tmr timer.Timer) (*edgeManager, error) {
 	listen := &conf.Edgebound.Listen
 	var (
 		ln      net.Listener
diff --git a/pkg/servicebound/service_dataplane.go b/pkg/servicebound/service_dataplane.go
index 8b476f8..f21e052 100644
--- a/pkg/servicebound/service_dataplane.go
+++ b/pkg/servicebound/service_dataplane.go
@@ -1,6 +1,7 @@
 package servicebound
 
 import (
+	"github.com/singchia/frontier/pkg/api"
 	"github.com/singchia/geminio"
 	"k8s.io/klog/v2"
 )
@@ -30,11 +31,11 @@ func (sm *serviceManager) closedStream(stream geminio.Stream) {
 }
 
 // forward to exchange
-func (sm *serviceManager) forward(end geminio.End) {
+func (sm *serviceManager) forward(meta *api.Meta, end geminio.End) {
 	serviceID := end.ClientID()
-	service := end.Meta()
+	service := meta.Service
 	klog.V(5).Infof("service forward stream, serviceID: %d, service: %s", serviceID, service)
 	if sm.exchange != nil {
-		sm.exchange.ForwardToService(end)
+		sm.exchange.ForwardToEdge(meta, end)
 	}
 }
diff --git a/pkg/servicebound/service_manager.go b/pkg/servicebound/service_manager.go
index 6780f3e..9de7f2b 100644
--- a/pkg/servicebound/service_manager.go
+++ b/pkg/servicebound/service_manager.go
@@ -1,17 +1,19 @@
 package servicebound
 
 import (
-	"context"
 	"crypto/tls"
 	"crypto/x509"
+	"encoding/json"
 	"net"
 	"os"
 	"sync"
 
 	"github.com/jumboframes/armorigo/synchub"
+	"github.com/singchia/frontier/pkg/api"
 	"github.com/singchia/frontier/pkg/config"
 	"github.com/singchia/frontier/pkg/mapmap"
 	"github.com/singchia/frontier/pkg/repo/dao"
+	"github.com/singchia/frontier/pkg/repo/model"
 	"github.com/singchia/frontier/pkg/security"
 	"github.com/singchia/frontier/pkg/utils"
 	"github.com/singchia/geminio"
@@ -22,31 +24,11 @@ import (
 	"k8s.io/klog/v2"
 )
 
-type Servicebound interface {
-	ListService() []geminio.End
-	// for management
-	GetService(service string) geminio.End
-	DelSerivces(service string) error
-}
-
-type ServiceInformer interface {
-	ServiceOnline(serviceID uint64, service string, addr net.Addr)
-	ServiceOffline(serviceID uint64, service string, addr net.Addr)
-	ServiceHeartbeat(serviceID uint64, service string, addr net.Addr)
-}
-
-type Exchange interface {
-	// rpc, message and raw io to edge
-	ForwardToService(geminio.End)
-	// stream to edge
-	StreamToEdge(geminio.Stream)
-}
-
 type serviceManager struct {
 	*delegate.UnimplementedDelegate
 
-	informer ServiceInformer
-	exchange Exchange
+	informer api.ServiceInformer
+	exchange api.Exchange
 	conf     *config.Configuration
 	// serviceID allocator
 	idFactory id.IDFactory
@@ -67,8 +49,8 @@ type serviceManager struct {
 	tmr timer.Timer
 }
 
-func newServiceManager(conf *config.Configuration, dao *dao.Dao, informer ServiceInformer,
-	exchange Exchange, tmr timer.Timer) (*serviceManager, error) {
+func newServiceManager(conf *config.Configuration, dao *dao.Dao, informer api.ServiceInformer,
+	exchange api.Exchange, tmr timer.Timer) (*serviceManager, error) {
 	listen := &conf.Servicebound.Listen
 	var (
 		ln      net.Listener
@@ -173,19 +155,40 @@ func (sm *serviceManager) handleConn(conn net.Conn) error {
 		klog.Errorf("service manager geminio server new end err: %s", err)
 		return err
 	}
-
-	// handle online event for end
-	if err = sm.online(end); err != nil {
+	meta := &api.Meta{}
+	err = json.Unmarshal(end.Meta(), meta)
+	if err != nil {
+		klog.Errorf("handle conn, json unmarshal err: %s", err)
 		return err
 	}
+	// register topics claim of end
+	sm.remoteReceiveClaim(end.ClientID(), meta.Topics)
 
-	// register methods for service
-	if err = end.Register(context.TODO(), "topic_claim", sm.RemoteReceiveClaim); err != nil {
+	// handle online event for end
+	if err = sm.online(end, meta); err != nil {
 		return err
 	}
 
 	// forward and stream up to edge
-	sm.forward(end)
+	sm.forward(meta, end)
+	return nil
+}
+
+func (sm *serviceManager) remoteReceiveClaim(serviceID uint64, topics []string) error {
+	klog.V(5).Infof("service remote receive claim, topics: %v, serviceID: %d", topics, serviceID)
+	var err error
+	// memdb
+	for _, topic := range topics {
+		st := &model.ServiceTopic{
+			Topic:     topic,
+			ServiceID: serviceID,
+		}
+		err = sm.dao.CreateServiceTopic(st)
+		if err != nil {
+			klog.Errorf("service remote receive claim, create service topic: %s, err: %s", topic, err)
+			return err
+		}
+	}
 	return nil
 }
 
diff --git a/pkg/servicebound/service_onoff.go b/pkg/servicebound/service_onoff.go
index e0188d2..d0f588e 100644
--- a/pkg/servicebound/service_onoff.go
+++ b/pkg/servicebound/service_onoff.go
@@ -1,13 +1,12 @@
 package servicebound
 
 import (
-	"context"
-	"encoding/json"
 	"net"
 	"strconv"
 	"time"
 
 	"github.com/jumboframes/armorigo/synchub"
+	"github.com/singchia/frontier/pkg/api"
 	"github.com/singchia/frontier/pkg/repo/dao"
 	"github.com/singchia/frontier/pkg/repo/model"
 	"github.com/singchia/geminio"
@@ -15,7 +14,7 @@ import (
 	"k8s.io/klog/v2"
 )
 
-func (sm *serviceManager) online(end geminio.End) error {
+func (sm *serviceManager) online(end geminio.End, meta *api.Meta) error {
 	// cache
 	var sync synchub.Sync
 	sm.mtx.Lock()
@@ -42,7 +41,7 @@ func (sm *serviceManager) online(end geminio.End) error {
 	// memdb
 	service := &model.Service{
 		ServiceID:  end.ClientID(),
-		Service:    string(end.Meta()),
+		Service:    meta.Service,
 		Addr:       end.RemoteAddr().String(),
 		CreateTime: time.Now().Unix(),
 	}
@@ -157,33 +156,6 @@ func (sm *serviceManager) RemoteRegistration(rpc string, serviceID, streamID uin
 	}
 }
 
-// RemoteReceiveClaim is called by wrappered RPC
-func (sm *serviceManager) RemoteReceiveClaim(ctx context.Context, req geminio.Request, rsp geminio.Response) {
-	// TODO return err
-	serviceID := req.ClientID()
-
-	claim := &TopicClaim{}
-	err := json.Unmarshal(req.Data(), claim)
-	if err != nil {
-		klog.Errorf("service remote receive claim, err: %s", err)
-		return
-	}
-	klog.V(5).Infof("service remote receive claim, topics: %v, serviceID: %d", claim.Topics, serviceID)
-
-	// memdb
-	for _, topic := range claim.Topics {
-		st := &model.ServiceTopic{
-			Topic:     topic,
-			ServiceID: serviceID,
-		}
-		err = sm.dao.CreateServiceTopic(st)
-		if err != nil {
-			klog.Errorf("service remote receive claim, create service topic: %s, err: %s", topic, err)
-			return
-		}
-	}
-}
-
 // actually the meta is service
 func (sm *serviceManager) GetClientID(meta []byte) (uint64, error) {
 	// TODO