diff --git a/commonspace/spacesyncproto/protos/spacesync.proto b/commonspace/spacesyncproto/protos/spacesync.proto
index d5b461cf..f7f44ae4 100644
--- a/commonspace/spacesyncproto/protos/spacesync.proto
+++ b/commonspace/spacesyncproto/protos/spacesync.proto
@@ -23,6 +23,8 @@ service SpaceSync {
     rpc SpacePull(SpacePullRequest) returns (SpacePullResponse);
     // ObjectSyncStream opens object sync stream with node or client
     rpc ObjectSyncStream(stream ObjectSyncMessage) returns (stream ObjectSyncMessage);
+    // ObjectSync sends object sync message and synchronously gets response message
+    rpc ObjectSync(ObjectSyncMessage) returns (ObjectSyncMessage);
 }
 
 // HeadSyncRange presenting a request for one range
diff --git a/commonspace/spacesyncproto/spacesync.pb.go b/commonspace/spacesyncproto/spacesync.pb.go
index 33caed5b..80571bf6 100644
--- a/commonspace/spacesyncproto/spacesync.pb.go
+++ b/commonspace/spacesyncproto/spacesync.pb.go
@@ -1254,75 +1254,75 @@ func init() {
 }
 
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+	0xeb, 0xc7, 0xbf, 0x30, 0xae, 0x2a, 0x3f, 0x5f, 0x83, 0x95, 0xb7, 0x3c, 0x9c, 0x20, 0xed, 0x43,
+	0xab, 0xea, 0x64, 0xee, 0xd2, 0xed, 0x99, 0x73, 0x62, 0xc4, 0x1f, 0xc3, 0xa6, 0xaf, 0x57, 0xe9,
+	0x09, 0x62, 0x5a, 0xbc, 0x58, 0xb3, 0x20, 0x7d, 0x03, 0xb7, 0x67, 0x12, 0x1e, 0x46, 0x3c, 0x11,
+	0xa3, 0x58, 0xaa, 0x6b, 0x92, 0x69, 0xfa, 0xae, 0x9f, 0x3d, 0x9c, 0x4d, 0x56, 0x41, 0xe6, 0xe9,
+	0xed, 0x3a, 0xfa, 0x9f, 0x2d, 0x68, 0xe5, 0xd4, 0x07, 0x5c, 0x72, 0xf2, 0x04, 0xd6, 0xbc, 0xac,
+	0xa6, 0xe6, 0x31, 0xbe, 0x7f, 0xbd, 0x0a, 0xd7, 0x4a, 0xcf, 0x72, 0x7d, 0x35, 0xcb, 0x84, 0x89,
+	0xce, 0x54, 0x70, 0xb0, 0xc8, 0x36, 0xcf, 0x82, 0x15, 0x16, 0xf4, 0x07, 0xf3, 0x24, 0x0d, 0x27,
+	0xa7, 0xc2, 0x4b, 0x83, 0x44, 0x1d, 0x67, 0x75, 0x97, 0xcc, 0x03, 0x9e, 0xa7, 0x58, 0xec, 0xc9,
+	0x53, 0x58, 0xe5, 0x9e, 0xd2, 0xd2, 0xce, 0xda, 0xbb, 0x74, 0xce, 0x59, 0x85, 0xe9, 0x99, 0xd6,
+	0x64, 0xc6, 0xe2, 0xc1, 0xef, 0x16, 0xac, 0x1f, 0xa6, 0xe9, 0x7e, 0xec, 0xa3, 0x20, 0x6d, 0x80,
+	0xd7, 0x11, 0x5e, 0x24, 0xe8, 0x49, 0xf4, 0x9d, 0x06, 0x71, 0xcc, 0x9b, 0xf6, 0x32, 0x10, 0x22,
+	0x88, 0xce, 0x1d, 0x8b, 0xdc, 0x30, 0x9d, 0x3b, 0xbc, 0x08, 0x84, 0x14, 0x8e, 0x4d, 0x6e, 0xc1,
+	0x0d, 0x0d, 0xbc, 0x8a, 0xa5, 0x1b, 0xed, 0x73, 0x6f, 0x84, 0xce, 0x12, 0x21, 0xd0, 0xd6, 0xa0,
+	0x2b, 0xb2, 0x0e, 0xfb, 0xce, 0x32, 0xe9, 0x42, 0x47, 0x57, 0x5a, 0xbc, 0x8a, 0xa5, 0x79, 0x68,
+	0x83, 0xd3, 0x10, 0x9d, 0x15, 0xd2, 0x01, 0x87, 0xa1, 0x87, 0x41, 0x22, 0x5d, 0xe1, 0x46, 0x6f,
+	0x79, 0x18, 0xf8, 0xce, 0xaa, 0xf2, 0x74, 0x98, 0xa6, 0x71, 0x7a, 0x7c, 0x76, 0x26, 0x50, 0x3a,
+	0xfe, 0x83, 0x27, 0x70, 0x77, 0x41, 0x32, 0x64, 0x13, 0x9a, 0x06, 0x3d, 0x45, 0xa7, 0xa1, 0x4c,
+	0x5f, 0x47, 0xa2, 0x00, 0xac, 0xdd, 0x7f, 0x6c, 0x68, 0x66, 0xb6, 0xd3, 0xc8, 0x23, 0xfb, 0xb0,
+	0x9e, 0xcf, 0x52, 0xd2, 0xab, 0x1d, 0xb0, 0x7a, 0x54, 0xf4, 0xee, 0xd5, 0x0f, 0xdf, 0x6c, 0x44,
+	0xbc, 0x30, 0x8c, 0x6a, 0xe0, 0x90, 0x7b, 0x73, 0xe3, 0xa1, 0x9c, 0x76, 0xbd, 0xad, 0x7a, 0xe1,
+	0x1c, 0x4f, 0x18, 0xd6, 0xf1, 0x14, 0x93, 0xab, 0x8e, 0xa7, 0x32, 0xb2, 0x18, 0x38, 0xe5, 0x47,
+	0xc0, 0x50, 0xa6, 0xc8, 0xc7, 0x64, 0x6b, 0xee, 0xd2, 0x57, 0xbe, 0x10, 0x7a, 0x1f, 0x94, 0x6e,
+	0x5b, 0x8f, 0x2c, 0x72, 0x04, 0x50, 0x0a, 0xfe, 0x0f, 0xdb, 0xf3, 0x4f, 0xff, 0xb8, 0xec, 0x5b,
+	0xef, 0x2f, 0xfb, 0xd6, 0xdf, 0x97, 0x7d, 0xeb, 0x97, 0xab, 0x7e, 0xe3, 0xfd, 0x55, 0xbf, 0xf1,
+	0xd7, 0x55, 0xbf, 0xf1, 0x5d, 0x6f, 0xf1, 0x57, 0xea, 0xe9, 0xaa, 0xfe, 0xdb, 0xfb, 0x37, 0x00,
+	0x00, 0xff, 0xff, 0xb6, 0xe1, 0x84, 0x46, 0xca, 0x0a, 0x00, 0x00,
 }
 
 func (m *HeadSyncRange) Marshal() (dAtA []byte, err error) {
diff --git a/commonspace/spacesyncproto/spacesync_drpc.pb.go b/commonspace/spacesyncproto/spacesync_drpc.pb.go
index 2c82a645..f9c7abae 100644
--- a/commonspace/spacesyncproto/spacesync_drpc.pb.go
+++ b/commonspace/spacesyncproto/spacesync_drpc.pb.go
@@ -44,6 +44,7 @@ type DRPCSpaceSyncClient interface {
 	SpacePush(ctx context.Context, in *SpacePushRequest) (*SpacePushResponse, error)
 	SpacePull(ctx context.Context, in *SpacePullRequest) (*SpacePullResponse, error)
 	ObjectSyncStream(ctx context.Context) (DRPCSpaceSync_ObjectSyncStreamClient, error)
+	ObjectSync(ctx context.Context, in *ObjectSyncMessage) (*ObjectSyncMessage, error)
 }
 
 type drpcSpaceSyncClient struct {
@@ -118,11 +119,21 @@ func (x *drpcSpaceSync_ObjectSyncStreamClient) RecvMsg(m *ObjectSyncMessage) err
 	return x.MsgRecv(m, drpcEncoding_File_commonspace_spacesyncproto_protos_spacesync_proto{})
 }
 
+func (c *drpcSpaceSyncClient) ObjectSync(ctx context.Context, in *ObjectSyncMessage) (*ObjectSyncMessage, error) {
+	out := new(ObjectSyncMessage)
+	err := c.cc.Invoke(ctx, "/spacesync.SpaceSync/ObjectSync", drpcEncoding_File_commonspace_spacesyncproto_protos_spacesync_proto{}, in, out)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 type DRPCSpaceSyncServer interface {
 	HeadSync(context.Context, *HeadSyncRequest) (*HeadSyncResponse, error)
 	SpacePush(context.Context, *SpacePushRequest) (*SpacePushResponse, error)
 	SpacePull(context.Context, *SpacePullRequest) (*SpacePullResponse, error)
 	ObjectSyncStream(DRPCSpaceSync_ObjectSyncStreamStream) error
+	ObjectSync(context.Context, *ObjectSyncMessage) (*ObjectSyncMessage, error)
 }
 
 type DRPCSpaceSyncUnimplementedServer struct{}
@@ -143,9 +154,13 @@ func (s *DRPCSpaceSyncUnimplementedServer) ObjectSyncStream(DRPCSpaceSync_Object
 	return drpcerr.WithCode(errors.New("Unimplemented"), drpcerr.Unimplemented)
 }
 
+func (s *DRPCSpaceSyncUnimplementedServer) ObjectSync(context.Context, *ObjectSyncMessage) (*ObjectSyncMessage, error) {
+	return nil, drpcerr.WithCode(errors.New("Unimplemented"), drpcerr.Unimplemented)
+}
+
 type DRPCSpaceSyncDescription struct{}
 
-func (DRPCSpaceSyncDescription) NumMethods() int { return 4 }
+func (DRPCSpaceSyncDescription) NumMethods() int { return 5 }
 
 func (DRPCSpaceSyncDescription) Method(n int) (string, drpc.Encoding, drpc.Receiver, interface{}, bool) {
 	switch n {
@@ -184,6 +199,15 @@ func (DRPCSpaceSyncDescription) Method(n int) (string, drpc.Encoding, drpc.Recei
 						&drpcSpaceSync_ObjectSyncStreamStream{in1.(drpc.Stream)},
 					)
 			}, DRPCSpaceSyncServer.ObjectSyncStream, true
+	case 4:
+		return "/spacesync.SpaceSync/ObjectSync", drpcEncoding_File_commonspace_spacesyncproto_protos_spacesync_proto{},
+			func(srv interface{}, ctx context.Context, in1, in2 interface{}) (drpc.Message, error) {
+				return srv.(DRPCSpaceSyncServer).
+					ObjectSync(
+						ctx,
+						in1.(*ObjectSyncMessage),
+					)
+			}, DRPCSpaceSyncServer.ObjectSync, true
 	default:
 		return "", nil, nil, nil, false
 	}
@@ -266,3 +290,19 @@ func (x *drpcSpaceSync_ObjectSyncStreamStream) Recv() (*ObjectSyncMessage, error
 func (x *drpcSpaceSync_ObjectSyncStreamStream) RecvMsg(m *ObjectSyncMessage) error {
 	return x.MsgRecv(m, drpcEncoding_File_commonspace_spacesyncproto_protos_spacesync_proto{})
 }
+
+type DRPCSpaceSync_ObjectSyncStream interface {
+	drpc.Stream
+	SendAndClose(*ObjectSyncMessage) error
+}
+
+type drpcSpaceSync_ObjectSyncStream struct {
+	drpc.Stream
+}
+
+func (x *drpcSpaceSync_ObjectSyncStream) SendAndClose(m *ObjectSyncMessage) error {
+	if err := x.MsgSend(m, drpcEncoding_File_commonspace_spacesyncproto_protos_spacesync_proto{}); err != nil {
+		return err
+	}
+	return x.CloseSend()
+}