diff --git a/pkg/innerring/blocktimer.go b/pkg/innerring/blocktimer.go
index 3c54a6ec..76f8a2c0 100644
--- a/pkg/innerring/blocktimer.go
+++ b/pkg/innerring/blocktimer.go
@@ -93,7 +93,7 @@ func newEpochTimer(args *epochTimerArgs) *timer.BlockTimer {
 				return
 			}
 
-			err := args.cnrWrapper.StopEstimation(epochN - 1)
+			err := args.cnrWrapper.StopEstimationNotary(epochN - 1)
 			if err != nil {
 				args.l.Warn("can't stop epoch estimation",
 					zap.Uint64("epoch", epochN),
diff --git a/pkg/innerring/processors/netmap/process_epoch.go b/pkg/innerring/processors/netmap/process_epoch.go
index ac2bb6b8..38781dc5 100644
--- a/pkg/innerring/processors/netmap/process_epoch.go
+++ b/pkg/innerring/processors/netmap/process_epoch.go
@@ -27,7 +27,7 @@ func (np *Processor) processNewEpoch(epoch uint64) {
 	}
 
 	if epoch > 0 { // estimates are invalid in genesis epoch
-		err = np.containerWrp.StartEstimation(epoch - 1)
+		err = np.containerWrp.StartEstimationNotary(epoch - 1)
 		if err != nil {
 			np.log.Warn("can't start container size estimation",
 				zap.Uint64("epoch", epoch),
diff --git a/pkg/morph/client/container/estimations.go b/pkg/morph/client/container/estimations.go
index 118ee296..0a03aa76 100644
--- a/pkg/morph/client/container/estimations.go
+++ b/pkg/morph/client/container/estimations.go
@@ -21,6 +21,13 @@ func (e *StopEstimation) SetEpoch(v int64) {
 }
 
 func (c *Client) StartEstimation(args StartEstimation) error {
+	return errors.Wrapf(c.client.Invoke(
+		c.startEstimation,
+		args.epoch,
+	), "could not invoke method (%s)", c.startEstimation)
+}
+
+func (c *Client) StartEstimationNotary(args StartEstimation) error {
 	return errors.Wrapf(c.client.NotaryInvoke(
 		c.startEstimation,
 		args.epoch,
@@ -28,6 +35,13 @@ func (c *Client) StartEstimation(args StartEstimation) error {
 }
 
 func (c *Client) StopEstimation(args StopEstimation) error {
+	return errors.Wrapf(c.client.Invoke(
+		c.stopEstimation,
+		args.epoch,
+	), "could not invoke method (%s)", c.stopEstimation)
+}
+
+func (c *Client) StopEstimationNotary(args StopEstimation) error {
 	return errors.Wrapf(c.client.NotaryInvoke(
 		c.stopEstimation,
 		args.epoch,
diff --git a/pkg/morph/client/container/wrapper/estimations.go b/pkg/morph/client/container/wrapper/estimations.go
index 49785992..0c17c2b5 100644
--- a/pkg/morph/client/container/wrapper/estimations.go
+++ b/pkg/morph/client/container/wrapper/estimations.go
@@ -12,6 +12,15 @@ func (w *Wrapper) StartEstimation(epoch uint64) error {
 	return w.client.StartEstimation(args)
 }
 
+// StartEstimationNotary votes to produce start estimation notification through
+// notary contract.
+func (w *Wrapper) StartEstimationNotary(epoch uint64) error {
+	args := container.StartEstimation{}
+	args.SetEpoch(int64(epoch))
+
+	return w.client.StartEstimationNotary(args)
+}
+
 // StopEstimation votes to produce stop estimation notification.
 func (w *Wrapper) StopEstimation(epoch uint64) error {
 	args := container.StopEstimation{}
@@ -19,3 +28,12 @@ func (w *Wrapper) StopEstimation(epoch uint64) error {
 
 	return w.client.StopEstimation(args)
 }
+
+// StopEstimationNotary votes to produce stop estimation notification through
+// notary contract.
+func (w *Wrapper) StopEstimationNotary(epoch uint64) error {
+	args := container.StopEstimation{}
+	args.SetEpoch(int64(epoch))
+
+	return w.client.StopEstimationNotary(args)
+}