diff --git a/common/hexutil/hexutil.go b/common/hexutil/hexutil.go
index ca8a4ae0ef..7b62045328 100644
--- a/common/hexutil/hexutil.go
+++ b/common/hexutil/hexutil.go
@@ -60,7 +60,7 @@ func Decode(input string) ([]byte, error) {
 	if len(input) == 0 {
 		return nil, ErrEmptyString
 	}
-	if !has0xPrefix(input) {
+	if !Has0xPrefix(input) {
 		return nil, ErrMissingPrefix
 	}
 	b, err := hex.DecodeString(input[2:])
@@ -185,31 +185,7 @@ func EncodeBig(bigint *big.Int) string {
 	}
 }
 
-func IsValidHexString(input string) bool {
-	if !has0xPrefix(input) {
-		return false
-	}
-
-	hexPart := input[2:]
-	if len(hexPart) == 0 {
-		return false
-	}
-
-	for _, c := range hexPart {
-		if !isHexChar(c) {
-			return false
-		}
-	}
-	return true
-}
-
-func isHexChar(c rune) bool {
-	return ('0' <= c && c <= '9') ||
-		('a' <= c && c <= 'f') ||
-		('A' <= c && c <= 'F')
-}
-
-func has0xPrefix(input string) bool {
+func Has0xPrefix(input string) bool {
 	return len(input) >= 2 && input[0] == '0' && (input[1] == 'x' || input[1] == 'X')
 }
 
@@ -217,7 +193,7 @@ func checkNumber(input string) (raw string, err error) {
 	if len(input) == 0 {
 		return "", ErrEmptyString
 	}
-	if !has0xPrefix(input) {
+	if !Has0xPrefix(input) {
 		return "", ErrMissingPrefix
 	}
 	input = input[2:]
diff --git a/rpc/types.go b/rpc/types.go
index f2031a883a..62384c8264 100644
--- a/rpc/types.go
+++ b/rpc/types.go
@@ -104,7 +104,7 @@ func (bn *BlockNumber) UnmarshalJSON(data []byte) error {
 	var err error
 
 	//Check if input is valid hex string before converting.
-	if hexutil.IsValidHexString(input) {
+	if hexutil.Has0xPrefix(input) {
 		blckNum, err = hexutil.DecodeUint64(input)
 	} else {
 		//Else try converting input directly into uint64 value