diff --git a/pkg/morph/client/balance/balanceOf.go b/pkg/morph/client/balance/balanceOf.go
index 2a6e16c2b..028fca0f9 100644
--- a/pkg/morph/client/balance/balanceOf.go
+++ b/pkg/morph/client/balance/balanceOf.go
@@ -41,7 +41,7 @@ func (c *Client) BalanceOf(args GetBalanceOfArgs) (*GetBalanceOfValues, error) {
 		return nil, errors.Errorf("unexpected stack item count (%s): %d", c.balanceOfMethod, ln)
 	}
 
-	amount, err := client.IntFromStackParameter(prms[0])
+	amount, err := client.IntFromStackItem(prms[0])
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get integer stack item from stack item (%s)", c.balanceOfMethod)
 	}
diff --git a/pkg/morph/client/balance/decimals.go b/pkg/morph/client/balance/decimals.go
index 12169d85a..fb65b76a5 100644
--- a/pkg/morph/client/balance/decimals.go
+++ b/pkg/morph/client/balance/decimals.go
@@ -33,7 +33,7 @@ func (c *Client) Decimals(args DecimalsArgs) (*DecimalsValues, error) {
 		return nil, errors.Errorf("unexpected stack item count (%s): %d", c.decimalsMethod, ln)
 	}
 
-	decimals, err := client.IntFromStackParameter(prms[0])
+	decimals, err := client.IntFromStackItem(prms[0])
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get integer stack item from stack item (%s)", c.decimalsMethod)
 	}
diff --git a/pkg/morph/client/client.go b/pkg/morph/client/client.go
index 308285e1b..0370cbbe6 100644
--- a/pkg/morph/client/client.go
+++ b/pkg/morph/client/client.go
@@ -7,6 +7,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/rpc/client"
 	sc "github.com/nspcc-dev/neo-go/pkg/smartcontract"
 	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"github.com/nspcc-dev/neo-go/pkg/wallet"
 	"github.com/nspcc-dev/neofs-node/pkg/util/logger"
 	"github.com/pkg/errors"
@@ -55,7 +56,7 @@ func (c *Client) Invoke(contract util.Uint160, fee util.Fixed8, method string, a
 		params = append(params, param)
 	}
 
-	cosigner := []transaction.Cosigner{
+	cosigner := []transaction.Signer{
 		{
 			Account: c.acc.PrivateKey().PublicKey().GetScriptHash(),
 			Scopes:  transaction.Global,
@@ -92,7 +93,7 @@ func (c *Client) Invoke(contract util.Uint160, fee util.Fixed8, method string, a
 
 // TestInvoke invokes contract method locally in neo-go node. This method should
 // be used to read data from smart-contract.
-func (c *Client) TestInvoke(contract util.Uint160, method string, args ...interface{}) ([]sc.Parameter, error) {
+func (c *Client) TestInvoke(contract util.Uint160, method string, args ...interface{}) ([]stackitem.Item, error) {
 	var params = make([]sc.Parameter, 0, len(args))
 
 	for i := range args {
@@ -104,7 +105,7 @@ func (c *Client) TestInvoke(contract util.Uint160, method string, args ...interf
 		params = append(params, p)
 	}
 
-	cosigner := []transaction.Cosigner{
+	cosigner := []transaction.Signer{
 		{
 			Account: c.acc.PrivateKey().PublicKey().GetScriptHash(),
 			Scopes:  transaction.Global,
diff --git a/pkg/morph/client/container/eacl.go b/pkg/morph/client/container/eacl.go
index b2ee42b70..b90dc7220 100644
--- a/pkg/morph/client/container/eacl.go
+++ b/pkg/morph/client/container/eacl.go
@@ -42,7 +42,7 @@ func (c *Client) EACL(args EACLArgs) (*EACLValues, error) {
 		return nil, errors.Errorf("unexpected stack item count (%s): %d", c.eaclMethod, ln)
 	}
 
-	eacl, err := client.BytesFromStackParameter(prms[0])
+	eacl, err := client.BytesFromStackItem(prms[0])
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get byte array from stack item (%s)", c.eaclMethod)
 	}
diff --git a/pkg/morph/client/container/get.go b/pkg/morph/client/container/get.go
index fb9e6d866..fa71a0d7b 100644
--- a/pkg/morph/client/container/get.go
+++ b/pkg/morph/client/container/get.go
@@ -42,7 +42,7 @@ func (c *Client) Get(args GetArgs) (*GetValues, error) {
 		return nil, errors.Errorf("unexpected stack item count (%s): %d", c.getMethod, ln)
 	}
 
-	cnrBytes, err := client.BytesFromStackParameter(prms[0])
+	cnrBytes, err := client.BytesFromStackItem(prms[0])
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get byte array from stack item (%s)", c.getMethod)
 	}
diff --git a/pkg/morph/client/container/list.go b/pkg/morph/client/container/list.go
index 4ea6dde2f..bc3a9ae2a 100644
--- a/pkg/morph/client/container/list.go
+++ b/pkg/morph/client/container/list.go
@@ -48,7 +48,7 @@ func (c *Client) List(args ListArgs) (*ListValues, error) {
 		return nil, errors.Errorf("unexpected stack item count (%s): %d", c.listMethod, ln)
 	}
 
-	prms, err = client.ArrayFromStackParameter(prms[0])
+	prms, err = client.ArrayFromStackItem(prms[0])
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get stack item array from stack item (%s)", c.listMethod)
 	}
@@ -58,7 +58,7 @@ func (c *Client) List(args ListArgs) (*ListValues, error) {
 	}
 
 	for i := range prms {
-		cid, err := client.BytesFromStackParameter(prms[i])
+		cid, err := client.BytesFromStackItem(prms[i])
 		if err != nil {
 			return nil, errors.Wrapf(err, "could not get byte array from stack item (%s)", c.listMethod)
 		}
diff --git a/pkg/morph/client/netmap/ir_list.go b/pkg/morph/client/netmap/ir_list.go
index 035c0553f..2587fc123 100644
--- a/pkg/morph/client/netmap/ir_list.go
+++ b/pkg/morph/client/netmap/ir_list.go
@@ -34,7 +34,7 @@ func (c *Client) InnerRingList(args InnerRingListArgs) (*InnerRingListValues, er
 		return nil, errors.Errorf("unexpected stack item count (%s): %d", c.innerRingListMethod, ln)
 	}
 
-	prms, err = client.ArrayFromStackParameter(prms[0])
+	prms, err = client.ArrayFromStackItem(prms[0])
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get stack item array from stack item (%s)", c.innerRingListMethod)
 	}
@@ -44,12 +44,12 @@ func (c *Client) InnerRingList(args InnerRingListArgs) (*InnerRingListValues, er
 	}
 
 	for i := range prms {
-		nodePrms, err := client.ArrayFromStackParameter(prms[i])
+		nodePrms, err := client.ArrayFromStackItem(prms[i])
 		if err != nil {
 			return nil, errors.Wrap(err, "could not get stack item array (Node #%d)")
 		}
 
-		key, err := client.BytesFromStackParameter(nodePrms[0])
+		key, err := client.BytesFromStackItem(nodePrms[0])
 		if err != nil {
 			return nil, errors.Wrapf(err, "could not parse stack item (Key #%d)", i)
 		}
diff --git a/pkg/morph/client/netmap/netmap.go b/pkg/morph/client/netmap/netmap.go
index 8efb4238a..ed58bc079 100644
--- a/pkg/morph/client/netmap/netmap.go
+++ b/pkg/morph/client/netmap/netmap.go
@@ -1,7 +1,7 @@
 package netmap
 
 import (
-	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"github.com/nspcc-dev/neofs-node/pkg/morph/client"
 	"github.com/pkg/errors"
 )
@@ -37,7 +37,7 @@ func (c *Client) NetMap(args GetNetMapArgs) (*GetNetMapValues, error) {
 		return nil, errors.Errorf("unexpected stack item count (%s): %d", c.netMapMethod, ln)
 	}
 
-	prms, err = client.ArrayFromStackParameter(prms[0])
+	prms, err = client.ArrayFromStackItem(prms[0])
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get stack item array from stack item (%s)", c.netMapMethod)
 	}
@@ -58,8 +58,8 @@ func (c *Client) NetMap(args GetNetMapArgs) (*GetNetMapValues, error) {
 	return res, nil
 }
 
-func peerInfoFromStackItem(prm smartcontract.Parameter) (*PeerInfo, error) {
-	prms, err := client.ArrayFromStackParameter(prm)
+func peerInfoFromStackItem(prm stackitem.Item) (*PeerInfo, error) {
+	prms, err := client.ArrayFromStackItem(prm)
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get stack item array (PeerInfo)")
 	} else if ln := len(prms); ln != nodeInfoFixedPrmNumber {
@@ -69,25 +69,25 @@ func peerInfoFromStackItem(prm smartcontract.Parameter) (*PeerInfo, error) {
 	res := new(PeerInfo)
 
 	// Address
-	res.address, err = client.BytesFromStackParameter(prms[0])
+	res.address, err = client.BytesFromStackItem(prms[0])
 	if err != nil {
 		return nil, errors.Wrap(err, "could not get byte array from stack item (Address)")
 	}
 
 	// Public key
-	if res.key, err = client.BytesFromStackParameter(prms[1]); err != nil {
+	if res.key, err = client.BytesFromStackItem(prms[1]); err != nil {
 		return nil, errors.Wrap(err, "could not get byte array from stack item (Public key)")
 	}
 
 	// Options
-	if prms, err = client.ArrayFromStackParameter(prms[2]); err != nil {
+	if prms, err = client.ArrayFromStackItem(prms[2]); err != nil {
 		return nil, errors.Wrapf(err, "could not get stack item array (Options)")
 	}
 
 	res.opts = make([][]byte, 0, len(prms))
 
 	for i := range prms {
-		opt, err := client.BytesFromStackParameter(prms[i])
+		opt, err := client.BytesFromStackItem(prms[i])
 		if err != nil {
 			return nil, errors.Wrapf(err, "could not get byte array from stack item (Option #%d)", i)
 		}
diff --git a/pkg/morph/client/static.go b/pkg/morph/client/static.go
index c903b3af9..404d54632 100644
--- a/pkg/morph/client/static.go
+++ b/pkg/morph/client/static.go
@@ -3,8 +3,8 @@ package client
 import (
 	"errors"
 
-	sc "github.com/nspcc-dev/neo-go/pkg/smartcontract"
 	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 )
 
 // StaticClient is a wrapper over Neo:Morph client
@@ -53,7 +53,7 @@ func (s StaticClient) Invoke(method string, args ...interface{}) error {
 }
 
 // TestInvoke calls TestInvoke method of Client with static internal script hash.
-func (s StaticClient) TestInvoke(method string, args ...interface{}) ([]sc.Parameter, error) {
+func (s StaticClient) TestInvoke(method string, args ...interface{}) ([]stackitem.Item, error) {
 	return s.client.TestInvoke(
 		s.scScriptHash,
 		method,