diff --git a/call.go b/call.go
index 30f0ab7..1858891 100644
--- a/call.go
+++ b/call.go
@@ -42,6 +42,7 @@ type Call struct {
 	CallName string
 	Contract *Contract
 	Method   string
+	Extend   any
 	Inputs   []any
 	Outputs  any
 	CanFail  bool
@@ -67,6 +68,15 @@ func (call *Call) Name(name string) *Call {
 	return call
 }
 
+func (call *Call) SetExtend(ext any) *Call {
+	call.Extend = ext
+	return call
+}
+
+func (call *Call) UnpackResult() []interface{} {
+	return call.Outputs.([]interface{})
+}
+
 // AllowFailure sets if the call is allowed to fail. This helps avoiding a revert
 // when one of the calls in the array fails.
 func (call *Call) AllowFailure() *Call {