diff --git a/rpc/api.go b/rpc/api.go
index 8d1a412d1..b5f759711 100644
--- a/rpc/api.go
+++ b/rpc/api.go
@@ -185,11 +185,7 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 			return err
 		}
 
-		if err := args.requirements(); err != nil {
-			return err
-		}
-
-		v, err := api.xeth().Transact(args.From, args.To, args.Value.String(), args.Gas.String(), args.GasPrice.String(), args.Data)
+		v, err := api.xeth().Transact(args.From.Hex(), args.To.Hex(), args.Value.String(), args.Gas.String(), args.GasPrice.String(), args.Data)
 		if err != nil {
 			return err
 		}
@@ -200,7 +196,7 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 			return err
 		}
 
-		v, err := api.xethAtStateNum(args.BlockNumber).Call(args.From, args.To, args.Value.String(), args.Gas.String(), args.GasPrice.String(), args.Data)
+		v, err := api.xethAtStateNum(args.BlockNumber).Call(args.From.Hex(), args.To.Hex(), args.Value.String(), args.Gas.String(), args.GasPrice.String(), args.Data)
 		if err != nil {
 			return err
 		}
diff --git a/rpc/args.go b/rpc/args.go
index 9a51959f4..2446e778f 100644
--- a/rpc/args.go
+++ b/rpc/args.go
@@ -93,8 +93,8 @@ func (args *GetBlockByNumberArgs) UnmarshalJSON(b []byte) (err error) {
 }
 
 type NewTxArgs struct {
-	From     string
-	To       string
+	From     common.Address
+	To       common.Address
 	Value    *big.Int
 	Gas      *big.Int
 	GasPrice *big.Int
@@ -122,9 +122,12 @@ func (args *NewTxArgs) UnmarshalJSON(b []byte) (err error) {
 		return NewDecodeParamError(err.Error())
 	}
 
-	// var ok bool
-	args.From = ext.From
-	args.To = ext.To
+	if len(ext.From) == 0 {
+		return NewValidationError("from", "is required")
+	}
+
+	args.From = common.HexToAddress(ext.From)
+	args.To = common.HexToAddress(ext.To)
 	args.Value = common.String2Big(ext.Value)
 	args.Gas = common.String2Big(ext.Gas)
 	args.GasPrice = common.String2Big(ext.GasPrice)
@@ -145,13 +148,6 @@ func (args *NewTxArgs) UnmarshalJSON(b []byte) (err error) {
 	return nil
 }
 
-func (args *NewTxArgs) requirements() error {
-	if len(args.From) == 0 {
-		return NewValidationError("From", "Is required")
-	}
-	return nil
-}
-
 type GetStorageArgs struct {
 	Address     string
 	BlockNumber int64
diff --git a/rpc/args_test.go b/rpc/args_test.go
index c6d3a558b..328eab0ec 100644
--- a/rpc/args_test.go
+++ b/rpc/args_test.go
@@ -149,8 +149,8 @@ func TestNewTxArgs(t *testing.T) {
   "data": "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"},
   "0x10"]`
 	expected := new(NewTxArgs)
-	expected.From = "0xb60e8dd61c5d32be8058bb8eb970870f07233155"
-	expected.To = "0xd46e8dd67c5d32be8058bb8eb970870f072445675"
+	expected.From = common.HexToAddress("0xb60e8dd61c5d32be8058bb8eb970870f07233155")
+	expected.To = common.HexToAddress("0xd46e8dd67c5d32be8058bb8eb970870f072445675")
 	expected.Gas = big.NewInt(30400)
 	expected.GasPrice = big.NewInt(10000000000000)
 	expected.Value = big.NewInt(10000000000000)
@@ -194,7 +194,7 @@ func TestNewTxArgs(t *testing.T) {
 func TestNewTxArgsBlockInt(t *testing.T) {
 	input := `[{"from": "0xb60e8dd61c5d32be8058bb8eb970870f07233155"}, 5]`
 	expected := new(NewTxArgs)
-	expected.From = "0xb60e8dd61c5d32be8058bb8eb970870f07233155"
+	expected.From = common.HexToAddress("0xb60e8dd61c5d32be8058bb8eb970870f07233155")
 	expected.BlockNumber = big.NewInt(5).Int64()
 
 	args := new(NewTxArgs)
@@ -221,31 +221,18 @@ func TestNewTxArgsEmpty(t *testing.T) {
 	}
 }
 
-func TestNewTxArgsReqs(t *testing.T) {
-	args := new(NewTxArgs)
-	args.From = "0xb60e8dd61c5d32be8058bb8eb970870f07233155"
-
-	err := args.requirements()
-	switch err.(type) {
-	case nil:
-		break
-	default:
-		t.Errorf("Get %T", err)
-	}
-}
+func TestNewTxArgsFromEmpty(t *testing.T) {
+	input := `[{"to": "0xb60e8dd61c5d32be8058bb8eb970870f07233155"}]`
 
-func TestNewTxArgsReqsFromBlank(t *testing.T) {
 	args := new(NewTxArgs)
-	args.From = ""
-
-	err := args.requirements()
+	err := json.Unmarshal([]byte(input), &args)
 	switch err.(type) {
 	case nil:
 		t.Error("Expected error but didn't get one")
 	case *ValidationError:
 		break
 	default:
-		t.Error("Wrong type of error")
+		t.Errorf("Expected *rpc.ValidationError, but got %T with message `%s`", err, err.Error())
 	}
 }