diff --git a/pkg/smartcontract/convertor.go b/pkg/smartcontract/convertor.go
deleted file mode 100644
index fe977a91d..000000000
--- a/pkg/smartcontract/convertor.go
+++ /dev/null
@@ -1,72 +0,0 @@
-package smartcontract
-
-import (
-	"fmt"
-	"math/big"
-
-	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
-)
-
-// ParameterFromStackItem converts stackitem.Item to Parameter.
-func ParameterFromStackItem(i stackitem.Item, seen map[stackitem.Item]bool) Parameter {
-	switch t := i.(type) {
-	case stackitem.Null, *stackitem.Pointer:
-		return NewParameter(AnyType)
-	case *stackitem.BigInteger:
-		return Parameter{
-			Type:  IntegerType,
-			Value: i.Value().(*big.Int),
-		}
-	case stackitem.Bool:
-		return Parameter{
-			Type:  BoolType,
-			Value: i.Value().(bool),
-		}
-	case *stackitem.ByteArray:
-		return Parameter{
-			Type:  ByteArrayType,
-			Value: i.Value().([]byte),
-		}
-	case *stackitem.Interop:
-		return Parameter{
-			Type:  InteropInterfaceType,
-			Value: nil,
-		}
-	case *stackitem.Buffer:
-		return Parameter{
-			Type:  ByteArrayType,
-			Value: i.Value().([]byte),
-		}
-	case *stackitem.Struct, *stackitem.Array:
-		var value []Parameter
-
-		if !seen[i] {
-			seen[i] = true
-			for _, stackItem := range i.Value().([]stackitem.Item) {
-				parameter := ParameterFromStackItem(stackItem, seen)
-				value = append(value, parameter)
-			}
-		}
-		return Parameter{
-			Type:  ArrayType,
-			Value: value,
-		}
-	case *stackitem.Map:
-		value := make([]ParameterPair, 0)
-		if !seen[i] {
-			seen[i] = true
-			for _, element := range i.Value().([]stackitem.MapElement) {
-				value = append(value, ParameterPair{
-					Key:   ParameterFromStackItem(element.Key, seen),
-					Value: ParameterFromStackItem(element.Value, seen),
-				})
-			}
-		}
-		return Parameter{
-			Type:  MapType,
-			Value: value,
-		}
-	default:
-		panic(fmt.Sprintf("unknown stack item type: %v", t))
-	}
-}
diff --git a/pkg/smartcontract/convertor_test.go b/pkg/smartcontract/convertor_test.go
deleted file mode 100644
index 3aaae34d5..000000000
--- a/pkg/smartcontract/convertor_test.go
+++ /dev/null
@@ -1,79 +0,0 @@
-package smartcontract
-
-import (
-	"math/big"
-	"testing"
-
-	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
-	"github.com/stretchr/testify/assert"
-)
-
-var toContractParameterTestCases = []struct {
-	input  stackitem.Item
-	result Parameter
-}{
-	{
-		input: stackitem.NewStruct([]stackitem.Item{
-			stackitem.NewBigInteger(big.NewInt(1)),
-			stackitem.NewBool(true),
-		}),
-		result: Parameter{Type: ArrayType, Value: []Parameter{
-			{Type: IntegerType, Value: big.NewInt(1)},
-			{Type: BoolType, Value: true},
-		}},
-	},
-	{
-		input:  stackitem.NewBool(false),
-		result: Parameter{Type: BoolType, Value: false},
-	},
-	{
-		input:  stackitem.NewByteArray([]byte{0x01, 0x02, 0x03}),
-		result: Parameter{Type: ByteArrayType, Value: []byte{0x01, 0x02, 0x03}},
-	},
-	{
-		input:  stackitem.NewBuffer([]byte{0x01, 0x02, 0x03}),
-		result: Parameter{Type: ByteArrayType, Value: []byte{0x01, 0x02, 0x03}},
-	},
-	{
-		input: stackitem.NewArray([]stackitem.Item{stackitem.NewBigInteger(big.NewInt(2)), stackitem.NewBool(true)}),
-		result: Parameter{Type: ArrayType, Value: []Parameter{
-			{Type: IntegerType, Value: big.NewInt(2)},
-			{Type: BoolType, Value: true},
-		}},
-	},
-	{
-		input:  stackitem.NewInterop(nil),
-		result: Parameter{Type: InteropInterfaceType, Value: nil},
-	},
-	{
-		input: stackitem.NewMapWithValue([]stackitem.MapElement{
-			{Key: stackitem.NewBigInteger(big.NewInt(1)), Value: stackitem.NewBool(true)},
-			{Key: stackitem.NewByteArray([]byte("qwerty")), Value: stackitem.NewBigInteger(big.NewInt(3))},
-			{Key: stackitem.NewBool(true), Value: stackitem.NewBool(false)},
-		}),
-		result: Parameter{
-			Type: MapType,
-			Value: []ParameterPair{
-				{
-					Key:   Parameter{Type: IntegerType, Value: big.NewInt(1)},
-					Value: Parameter{Type: BoolType, Value: true},
-				}, {
-					Key:   Parameter{Type: ByteArrayType, Value: []byte("qwerty")},
-					Value: Parameter{Type: IntegerType, Value: big.NewInt(3)},
-				}, {
-
-					Key:   Parameter{Type: BoolType, Value: true},
-					Value: Parameter{Type: BoolType, Value: false},
-				},
-			},
-		},
-	},
-}
-
-func TestToContractParameter(t *testing.T) {
-	for _, tc := range toContractParameterTestCases {
-		seen := make(map[stackitem.Item]bool)
-		res := ParameterFromStackItem(tc.input, seen)
-		assert.Equal(t, res, tc.result)
-	}
-}