diff --git a/javascript/types.go b/javascript/types.go
index d580d14f5..001b50a70 100644
--- a/javascript/types.go
+++ b/javascript/types.go
@@ -62,7 +62,7 @@ type JSEthereum struct {
 
 func (self *JSEthereum) Block(v interface{}) otto.Value {
 	if number, ok := v.(int64); ok {
-		return self.toVal(&JSBlock{self.XEth.BlockByNumber(uint64(number)), self})
+		return self.toVal(&JSBlock{self.XEth.BlockByNumber(number), self})
 	} else if hash, ok := v.(string); ok {
 		return self.toVal(&JSBlock{self.XEth.BlockByHash(hash), self})
 	}
diff --git a/rpc/args.go b/rpc/args.go
index ba2ef731a..43cad5fde 100644
--- a/rpc/args.go
+++ b/rpc/args.go
@@ -33,7 +33,7 @@ func (args *GetBlockByHashArgs) UnmarshalJSON(b []byte) (err error) {
 }
 
 type GetBlockByNumberArgs struct {
-	BlockNumber  uint64
+	BlockNumber  int64
 	Transactions bool
 }
 
@@ -47,7 +47,7 @@ func (args *GetBlockByNumberArgs) UnmarshalJSON(b []byte) (err error) {
 	if len(obj) < 1 {
 		return errArguments
 	}
-	args.BlockNumber = uint64(ethutil.Big(obj[0].(string)).Int64())
+	args.BlockNumber = ethutil.Big(obj[0].(string)).Int64()
 
 	if len(obj) > 1 {
 		args.Transactions = obj[1].(bool)
@@ -94,7 +94,7 @@ func (args *NewTxArgs) UnmarshalJSON(b []byte) (err error) {
 
 type GetStorageArgs struct {
 	Address     string
-	BlockNumber uint64
+	BlockNumber int64
 }
 
 func (args *GetStorageArgs) UnmarshalJSON(b []byte) (err error) {
@@ -110,7 +110,11 @@ func (args *GetStorageArgs) UnmarshalJSON(b []byte) (err error) {
 	args.Address = obj[0].(string)
 
 	if len(obj) > 1 {
-		args.BlockNumber = uint64(ethutil.Big(obj[1].(string)).Int64())
+		if obj[1].(string) == "latest" {
+			args.BlockNumber = -1
+		} else {
+			args.BlockNumber = ethutil.Big(obj[1].(string)).Int64()
+		}
 	}
 
 	return nil
@@ -126,7 +130,7 @@ func (args *GetStorageArgs) requirements() error {
 type GetStorageAtArgs struct {
 	Address     string
 	Key         string
-	BlockNumber uint64
+	BlockNumber int64
 }
 
 func (args *GetStorageAtArgs) UnmarshalJSON(b []byte) (err error) {
@@ -143,7 +147,11 @@ func (args *GetStorageAtArgs) UnmarshalJSON(b []byte) (err error) {
 	args.Key = obj[1].(string)
 
 	if len(obj) > 2 {
-		args.BlockNumber = ethutil.BytesToNumber(fromHex(obj[2].(string)))
+		if obj[2].(string) == "latest" {
+			args.BlockNumber = -1
+		} else {
+			args.BlockNumber = ethutil.Big(obj[2].(string)).Int64()
+		}
 	}
 
 	return nil
@@ -162,7 +170,7 @@ func (args *GetStorageAtArgs) requirements() error {
 
 type GetTxCountArgs struct {
 	Address     string
-	BlockNumber uint64
+	BlockNumber int64
 }
 
 func (args *GetTxCountArgs) UnmarshalJSON(b []byte) (err error) {
@@ -179,7 +187,11 @@ func (args *GetTxCountArgs) UnmarshalJSON(b []byte) (err error) {
 	args.Address = obj[0].(string)
 
 	if len(obj) > 1 {
-		args.BlockNumber = uint64(ethutil.Big(obj[1].(string)).Int64())
+		if obj[1].(string) == "latest" {
+			args.BlockNumber = -1
+		} else {
+			args.BlockNumber = ethutil.Big(obj[1].(string)).Int64()
+		}
 	}
 
 	return nil
@@ -194,7 +206,7 @@ func (args *GetTxCountArgs) requirements() error {
 
 type GetBalanceArgs struct {
 	Address     string
-	BlockNumber uint64
+	BlockNumber int64
 }
 
 func (args *GetBalanceArgs) UnmarshalJSON(b []byte) (err error) {
@@ -210,7 +222,11 @@ func (args *GetBalanceArgs) UnmarshalJSON(b []byte) (err error) {
 	args.Address = obj[0].(string)
 
 	if len(obj) > 1 {
-		args.BlockNumber = uint64(ethutil.Big(obj[1].(string)).Int64())
+		if obj[1].(string) == "latest" {
+			args.BlockNumber = -1
+		} else {
+			args.BlockNumber = ethutil.Big(obj[1].(string)).Int64()
+		}
 	}
 
 	return nil
@@ -225,7 +241,7 @@ func (args *GetBalanceArgs) requirements() error {
 
 type GetDataArgs struct {
 	Address     string
-	BlockNumber uint64
+	BlockNumber int64
 }
 
 func (args *GetDataArgs) UnmarshalJSON(b []byte) (err error) {
@@ -241,7 +257,11 @@ func (args *GetDataArgs) UnmarshalJSON(b []byte) (err error) {
 	args.Address = obj[0].(string)
 
 	if len(obj) > 1 {
-		args.BlockNumber = uint64(ethutil.Big(obj[1].(string)).Int64())
+		if obj[1].(string) == "latest" {
+			args.BlockNumber = -1
+		} else {
+			args.BlockNumber = ethutil.Big(obj[1].(string)).Int64()
+		}
 	}
 
 	return nil
@@ -273,41 +293,41 @@ func (args *Sha3Args) UnmarshalJSON(b []byte) (err error) {
 	return nil
 }
 
-type FilterArgs struct {
-	FromBlock uint64
-	ToBlock   uint64
-	Limit     uint64
-	Offset    uint64
-	Address   string
-	Topics    []string
-}
+// type FilterArgs struct {
+// 	FromBlock uint64
+// 	ToBlock   uint64
+// 	Limit     uint64
+// 	Offset    uint64
+// 	Address   string
+// 	Topics    []string
+// }
 
-func (args *FilterArgs) UnmarshalJSON(b []byte) (err error) {
-	var obj []struct {
-		FromBlock string   `json:"fromBlock"`
-		ToBlock   string   `json:"toBlock"`
-		Limit     string   `json:"limit"`
-		Offset    string   `json:"offset"`
-		Address   string   `json:"address"`
-		Topics    []string `json:"topics"`
-	}
+// func (args *FilterArgs) UnmarshalJSON(b []byte) (err error) {
+// 	var obj []struct {
+// 		FromBlock string   `json:"fromBlock"`
+// 		ToBlock   string   `json:"toBlock"`
+// 		Limit     string   `json:"limit"`
+// 		Offset    string   `json:"offset"`
+// 		Address   string   `json:"address"`
+// 		Topics    []string `json:"topics"`
+// 	}
 
-	if err = json.Unmarshal(b, &obj); err != nil {
-		return errDecodeArgs
-	}
+// 	if err = json.Unmarshal(b, &obj); err != nil {
+// 		return errDecodeArgs
+// 	}
 
-	if len(obj) < 1 {
-		return errArguments
-	}
-	args.FromBlock = uint64(ethutil.Big(obj[0].FromBlock).Int64())
-	args.ToBlock = uint64(ethutil.Big(obj[0].ToBlock).Int64())
-	args.Limit = uint64(ethutil.Big(obj[0].Limit).Int64())
-	args.Offset = uint64(ethutil.Big(obj[0].Offset).Int64())
-	args.Address = obj[0].Address
-	args.Topics = obj[0].Topics
+// 	if len(obj) < 1 {
+// 		return errArguments
+// 	}
+// 	args.FromBlock = uint64(ethutil.Big(obj[0].FromBlock).Int64())
+// 	args.ToBlock = uint64(ethutil.Big(obj[0].ToBlock).Int64())
+// 	args.Limit = uint64(ethutil.Big(obj[0].Limit).Int64())
+// 	args.Offset = uint64(ethutil.Big(obj[0].Offset).Int64())
+// 	args.Address = obj[0].Address
+// 	args.Topics = obj[0].Topics
 
-	return nil
-}
+// 	return nil
+// }
 
 type FilterOptions struct {
 	Earliest int64
@@ -415,8 +435,8 @@ func (args *WhisperMessageArgs) UnmarshalJSON(b []byte) (err error) {
 	args.To = obj[0].To
 	args.From = obj[0].From
 	args.Topic = obj[0].Topic
-	args.Priority = uint32(ethutil.BytesToNumber(fromHex(obj[0].Priority)))
-	args.Ttl = uint32(ethutil.BytesToNumber(fromHex(obj[0].Ttl)))
+	args.Priority = uint32(ethutil.Big(obj[0].Priority).Int64())
+	args.Ttl = uint32(ethutil.Big(obj[0].Ttl).Int64())
 
 	return nil
 }
@@ -474,7 +494,7 @@ func (args *FilterIdArgs) UnmarshalJSON(b []byte) (err error) {
 		return errDecodeArgs
 	}
 
-	args.Id = int(ethutil.BytesToNumber(fromHex(obj[0])))
+	args.Id = int(ethutil.Big(obj[0]).Int64())
 
 	return nil
 }
@@ -500,13 +520,17 @@ func (args *WhisperIdentityArgs) UnmarshalJSON(b []byte) (err error) {
 }
 
 type WhisperFilterArgs struct {
-	To     string
+	To     string `json:"to"`
 	From   string
 	Topics []string
 }
 
 func (args *WhisperFilterArgs) UnmarshalJSON(b []byte) (err error) {
-	var obj []WhisperFilterArgs
+	var obj []struct {
+		To     string
+		From   string
+		Topics []string
+	}
 
 	if err = json.Unmarshal(b, &obj); err != nil {
 		return errDecodeArgs
diff --git a/rpc/args_test.go b/rpc/args_test.go
index 380ed176b..1e6609b79 100644
--- a/rpc/args_test.go
+++ b/rpc/args_test.go
@@ -30,6 +30,10 @@ func TestGetBalanceArgs(t *testing.T) {
 		t.Error(err)
 	}
 
+	if err := args.requirements(); err != nil {
+		t.Error(err)
+	}
+
 	if args.Address != expected.Address {
 		t.Errorf("Address should be %v but is %v", expected.Address, args.Address)
 	}
@@ -123,3 +127,308 @@ func TestNewTxArgs(t *testing.T) {
 		t.Errorf("Data shoud be %#v but is %#v", expected.Data, args.Data)
 	}
 }
+
+func TestGetStorageArgs(t *testing.T) {
+	input := `["0x407d73d8a49eeb85d32cf465507dd71d507100c1", "latest"]`
+	expected := new(GetStorageArgs)
+	expected.Address = "0x407d73d8a49eeb85d32cf465507dd71d507100c1"
+	expected.BlockNumber = -1
+
+	args := new(GetStorageArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if err := args.requirements(); err != nil {
+		t.Error(err)
+	}
+
+	if expected.Address != args.Address {
+		t.Errorf("Address shoud be %#v but is %#v", expected.Address, args.Address)
+	}
+
+	if expected.BlockNumber != args.BlockNumber {
+		t.Errorf("BlockNumber shoud be %#v but is %#v", expected.BlockNumber, args.BlockNumber)
+	}
+}
+
+func TestGetStorageAtArgs(t *testing.T) {
+	input := `["0x407d73d8a49eeb85d32cf465507dd71d507100c1", "0x0", "0x2"]`
+	expected := new(GetStorageAtArgs)
+	expected.Address = "0x407d73d8a49eeb85d32cf465507dd71d507100c1"
+	expected.Key = "0x0"
+	expected.BlockNumber = 2
+
+	args := new(GetStorageAtArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if err := args.requirements(); err != nil {
+		t.Error(err)
+	}
+
+	if expected.Address != args.Address {
+		t.Errorf("Address shoud be %#v but is %#v", expected.Address, args.Address)
+	}
+
+	if expected.Key != args.Key {
+		t.Errorf("Address shoud be %#v but is %#v", expected.Address, args.Address)
+	}
+
+	if expected.BlockNumber != args.BlockNumber {
+		t.Errorf("BlockNumber shoud be %#v but is %#v", expected.BlockNumber, args.BlockNumber)
+	}
+}
+
+func TestGetTxCountArgs(t *testing.T) {
+	input := `["0x407d73d8a49eeb85d32cf465507dd71d507100c1", "latest"]`
+	expected := new(GetTxCountArgs)
+	expected.Address = "0x407d73d8a49eeb85d32cf465507dd71d507100c1"
+	expected.BlockNumber = -1
+
+	args := new(GetTxCountArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if err := args.requirements(); err != nil {
+		t.Error(err)
+	}
+
+	if expected.Address != args.Address {
+		t.Errorf("Address shoud be %#v but is %#v", expected.Address, args.Address)
+	}
+
+	if expected.BlockNumber != args.BlockNumber {
+		t.Errorf("BlockNumber shoud be %#v but is %#v", expected.BlockNumber, args.BlockNumber)
+	}
+}
+
+func TestGetDataArgs(t *testing.T) {
+	input := `["0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8", "latest"]`
+	expected := new(GetDataArgs)
+	expected.Address = "0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8"
+	expected.BlockNumber = -1
+
+	args := new(GetDataArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if err := args.requirements(); err != nil {
+		t.Error(err)
+	}
+
+	if expected.Address != args.Address {
+		t.Errorf("Address shoud be %#v but is %#v", expected.Address, args.Address)
+	}
+
+	if expected.BlockNumber != args.BlockNumber {
+		t.Errorf("BlockNumber shoud be %#v but is %#v", expected.BlockNumber, args.BlockNumber)
+	}
+}
+
+func TestFilterOptions(t *testing.T) {
+	input := `[{
+  "fromBlock": "0x1",
+  "toBlock": "0x2",
+  "limit": "0x3",
+  "offset": "0x0",
+  "address": "0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8",
+  "topics": ["0x12341234"]}]`
+	expected := new(FilterOptions)
+	expected.Earliest = 1
+	expected.Latest = 2
+	expected.Max = 3
+	expected.Skip = 0
+	expected.Address = "0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8"
+	expected.Topic = []string{"0x12341234"}
+
+	args := new(FilterOptions)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if expected.Earliest != args.Earliest {
+		t.Errorf("Earliest shoud be %#v but is %#v", expected.Earliest, args.Earliest)
+	}
+
+	if expected.Latest != args.Latest {
+		t.Errorf("Latest shoud be %#v but is %#v", expected.Latest, args.Latest)
+	}
+
+	if expected.Max != args.Max {
+		t.Errorf("Max shoud be %#v but is %#v", expected.Max, args.Max)
+	}
+
+	if expected.Skip != args.Skip {
+		t.Errorf("Skip shoud be %#v but is %#v", expected.Skip, args.Skip)
+	}
+
+	if expected.Address != args.Address {
+		t.Errorf("Address shoud be %#v but is %#v", expected.Address, args.Address)
+	}
+
+	// if expected.Topic != args.Topic {
+	// 	t.Errorf("Topic shoud be %#v but is %#v", expected.Topic, args.Topic)
+	// }
+}
+
+func TestDbArgs(t *testing.T) {
+	input := `["0x74657374","0x6b6579","0x6d79537472696e67"]`
+	expected := new(DbArgs)
+	expected.Database = "0x74657374"
+	expected.Key = "0x6b6579"
+	expected.Value = "0x6d79537472696e67"
+
+	args := new(DbArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if err := args.requirements(); err != nil {
+		t.Error(err)
+	}
+
+	if expected.Database != args.Database {
+		t.Errorf("Database shoud be %#v but is %#v", expected.Database, args.Database)
+	}
+
+	if expected.Key != args.Key {
+		t.Errorf("Key shoud be %#v but is %#v", expected.Key, args.Key)
+	}
+
+	if expected.Value != args.Value {
+		t.Errorf("Value shoud be %#v but is %#v", expected.Value, args.Value)
+	}
+}
+
+func TestWhisperMessageArgs(t *testing.T) {
+	input := `[{"from":"0xc931d93e97ab07fe42d923478ba2465f2",
+  "topics": ["0x68656c6c6f20776f726c64"],
+  "payload":"0x68656c6c6f20776f726c64",
+  "ttl": "0x64",
+  "priority": "0x64"}]`
+	expected := new(WhisperMessageArgs)
+	expected.From = "0xc931d93e97ab07fe42d923478ba2465f2"
+	expected.To = ""
+	expected.Payload = "0x68656c6c6f20776f726c64"
+	expected.Priority = 100
+	expected.Ttl = 100
+	expected.Topic = []string{"0x68656c6c6f20776f726c64"}
+
+	args := new(WhisperMessageArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if expected.From != args.From {
+		t.Errorf("From shoud be %#v but is %#v", expected.From, args.From)
+	}
+
+	if expected.To != args.To {
+		t.Errorf("To shoud be %#v but is %#v", expected.To, args.To)
+	}
+
+	if expected.Payload != args.Payload {
+		t.Errorf("Value shoud be %#v but is %#v", expected.Payload, args.Payload)
+	}
+
+	if expected.Ttl != args.Ttl {
+		t.Errorf("Ttl shoud be %#v but is %#v", expected.Ttl, args.Ttl)
+	}
+
+	if expected.Priority != args.Priority {
+		t.Errorf("Priority shoud be %#v but is %#v", expected.Priority, args.Priority)
+	}
+
+	// if expected.Topic != args.Topic {
+	// 	t.Errorf("Topic shoud be %#v but is %#v", expected.Topic, args.Topic)
+	// }
+}
+
+func TestFilterIdArgs(t *testing.T) {
+	input := `["0x7"]`
+	expected := new(FilterIdArgs)
+	expected.Id = 7
+
+	args := new(FilterIdArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if expected.Id != args.Id {
+		t.Errorf("Id shoud be %#v but is %#v", expected.Id, args.Id)
+	}
+}
+
+func TestWhsiperFilterArgs(t *testing.T) {
+	input := `[{"topics": ["0x68656c6c6f20776f726c64"], "to": "0x34ag445g3455b34"}]`
+	expected := new(WhisperFilterArgs)
+	expected.From = ""
+	expected.To = "0x34ag445g3455b34"
+	expected.Topics = []string{"0x68656c6c6f20776f726c64"}
+
+	args := new(WhisperFilterArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if expected.From != args.From {
+		t.Errorf("From shoud be %#v but is %#v", expected.From, args.From)
+	}
+
+	if expected.To != args.To {
+		t.Errorf("To shoud be %#v but is %#v", expected.To, args.To)
+	}
+
+	// if expected.Topics != args.Topics {
+	// 	t.Errorf("Topics shoud be %#v but is %#v", expected.Topics, args.Topics)
+	// }
+}
+
+func TestCompileArgs(t *testing.T) {
+	input := `["contract test { function multiply(uint a) returns(uint d) {   return a * 7;   } }"]`
+	expected := new(CompileArgs)
+	expected.Source = `contract test { function multiply(uint a) returns(uint d) {   return a * 7;   } }`
+
+	args := new(CompileArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if expected.Source != args.Source {
+		t.Errorf("Source shoud be %#v but is %#v", expected.Source, args.Source)
+	}
+}
+
+func TestFilterStringArgs(t *testing.T) {
+	input := `["pending"]`
+	expected := new(FilterStringArgs)
+	expected.Word = "pending"
+
+	args := new(FilterStringArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if expected.Word != args.Word {
+		t.Errorf("Word shoud be %#v but is %#v", expected.Word, args.Word)
+	}
+}
+
+func TestWhisperIdentityArgs(t *testing.T) {
+	input := `["0xc931d93e97ab07fe42d923478ba2465f283"]`
+	expected := new(WhisperIdentityArgs)
+	expected.Identity = "0xc931d93e97ab07fe42d923478ba2465f283"
+
+	args := new(WhisperIdentityArgs)
+	if err := json.Unmarshal([]byte(input), &args); err != nil {
+		t.Error(err)
+	}
+
+	if expected.Identity != args.Identity {
+		t.Errorf("Identity shoud be %#v but is %#v", expected.Identity, args.Identity)
+	}
+}
diff --git a/xeth/xeth.go b/xeth/xeth.go
index 451d3ceea..b78a45f88 100644
--- a/xeth/xeth.go
+++ b/xeth/xeth.go
@@ -86,17 +86,21 @@ func (self *XEth) BlockByHash(strHash string) *Block {
 	return NewBlock(block)
 }
 
-func (self *XEth) BlockByNumber(num uint64) *Block {
-	return NewBlock(self.chainManager.GetBlockByNumber(num))
+func (self *XEth) BlockByNumber(num int64) *Block {
+	if num == -1 {
+		return NewBlock(self.chainManager.CurrentBlock())
+	}
+
+	return NewBlock(self.chainManager.GetBlockByNumber(uint64(num)))
 }
 
 func (self *XEth) Block(v interface{}) *Block {
 	if n, ok := v.(int32); ok {
-		return self.BlockByNumber(uint64(n))
+		return self.BlockByNumber(int64(n))
 	} else if str, ok := v.(string); ok {
 		return self.BlockByHash(str)
 	} else if f, ok := v.(float64); ok { // Don't ask ...
-		return self.BlockByNumber(uint64(f))
+		return self.BlockByNumber(int64(f))
 	}
 
 	return nil