diff --git a/api/service/manager.go b/api/service/manager.go
index baaaba29b..2beb79fe5 100644
--- a/api/service/manager.go
+++ b/api/service/manager.go
@@ -82,6 +82,11 @@ func (m *Manager) GetServices() []Service {
 	return m.services
 }
 
+// GetService get the specified service
+func (m *Manager) GetService(t Type) Service {
+	return m.serviceMap[t]
+}
+
 // StartServices run all registered services. If one of the starting service returns
 // an error, closing all started services.
 func (m *Manager) StartServices() (err error) {
diff --git a/api/service/synchronize/service.go b/api/service/synchronize/service.go
new file mode 100644
index 000000000..92aac3206
--- /dev/null
+++ b/api/service/synchronize/service.go
@@ -0,0 +1,37 @@
+package synchronize
+
+import (
+	"github.com/ethereum/go-ethereum/rpc"
+	"github.com/harmony-one/harmony/core"
+	"github.com/harmony-one/harmony/hmy/downloader"
+	"github.com/harmony-one/harmony/p2p"
+)
+
+// Service is simply a adapter of Downloaders, which support block synchronization
+type Service struct {
+	Downloaders *downloader.Downloaders
+}
+
+// NewService creates the a new downloader service
+func NewService(host p2p.Host, bcs []*core.BlockChain, config downloader.Config) *Service {
+	return &Service{
+		Downloaders: downloader.NewDownloaders(host, bcs, config),
+	}
+}
+
+// Start start the service
+func (s *Service) Start() error {
+	s.Downloaders.Start()
+	return nil
+}
+
+// Stop stop the service
+func (s *Service) Stop() error {
+	s.Downloaders.Close()
+	return nil
+}
+
+// APIs return all APIs of the service
+func (s *Service) APIs() []rpc.API {
+	return nil
+}
diff --git a/p2p/host.go b/p2p/host.go
index ba8b1ad77..020f45969 100644
--- a/p2p/host.go
+++ b/p2p/host.go
@@ -10,6 +10,8 @@ import (
 	"strings"
 	"sync"
 
+	"github.com/libp2p/go-libp2p-core/protocol"
+
 	"github.com/harmony-one/bls/ffi/go/bls"
 	nodeconfig "github.com/harmony-one/harmony/internal/configs/node"
 	"github.com/harmony-one/harmony/internal/utils"
@@ -230,8 +232,9 @@ func (host *HostV2) C() (int, int, int) {
 // AddStreamProtocol adds the stream protocols to the host to be started and closed
 // when the host starts or close
 func (host *HostV2) AddStreamProtocol(protocols ...sttypes.Protocol) {
-	for _, protocol := range protocols {
-		host.streamProtos = append(host.streamProtos, protocol)
+	for _, proto := range protocols {
+		host.streamProtos = append(host.streamProtos, proto)
+		host.h.SetStreamHandlerMatch(protocol.ID(proto.ProtoID()), proto.Match, proto.HandleStream)
 	}
 }