diff --git a/src/Utils.php b/src/Utils.php
index 44e309c..c2a10e4 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -11,6 +11,7 @@
 
 namespace Web3;
 
+use RuntimeException;
 use InvalidArgumentException;
 use stdClass;
 use kornrunner\Keccak;
@@ -214,6 +215,22 @@ class Utils
         return '0x' . $hash;
     }
 
+    /**
+     * toString
+     * 
+     * @param mixed $value
+     * @return string
+     */
+    public function toString($value)
+    {
+        try {
+            $value = (string) $value;
+        } catch (\Exception $e) {
+            throw new RuntimeException('Cannot transform value to string!');
+        }
+        return $value;
+    }
+
     /**
      * toWei
      * Change number from unit to wei.