diff --git a/src/Methods/IMethod.php b/src/Methods/IMethod.php
new file mode 100644
index 0000000..5c4fd45
--- /dev/null
+++ b/src/Methods/IMethod.php
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * This file is part of web3.php package.
+ * 
+ * (c) Kuan-Cheng,Lai <alk03073135@gmail.com>
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
+namespace Web3\Methods;
+
+interface IMethod
+{
+    /**
+     * transform
+     * 
+     * @param array &$data
+     * @param array $rules
+     * @return array
+     */
+    public function transform($data, $rules);
+}
\ No newline at end of file
diff --git a/src/Methods/IRPC.php b/src/Methods/IRPC.php
new file mode 100644
index 0000000..e913685
--- /dev/null
+++ b/src/Methods/IRPC.php
@@ -0,0 +1,29 @@
+<?php
+
+/**
+ * This file is part of web3.php package.
+ * 
+ * (c) Kuan-Cheng,Lai <alk03073135@gmail.com>
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
+namespace Web3\Methods;
+
+interface IRPC
+{
+    /**
+     * __toString
+     * 
+     * @return array
+     */
+    public function __toString();
+
+    /**
+     * toPayload
+     * 
+     * @return array
+     */
+    public function toPayload();
+}
\ No newline at end of file
diff --git a/src/Methods/JSONRPC.php b/src/Methods/JSONRPC.php
new file mode 100644
index 0000000..3822716
--- /dev/null
+++ b/src/Methods/JSONRPC.php
@@ -0,0 +1,212 @@
+<?php
+
+/**
+ * This file is part of web3.php package.
+ * 
+ * (c) Kuan-Cheng,Lai <alk03073135@gmail.com>
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
+namespace Web3\Methods;
+
+use InvalidArgumentException;
+use Web3\Methods\IRPC;
+
+class JSONRPC implements IRPC
+{
+    /**
+     * id
+     * 
+     * @var int
+     */
+    protected $id = 0;
+
+    /**
+     * rpcVersion
+     * 
+     * @var string
+     */
+    protected $rpcVersion = '2.0';
+
+    /**
+     * method
+     * 
+     * @var string
+     */
+    protected $method = '';
+
+    /**
+     * arguments
+     * 
+     * @var array
+     */
+    protected $arguments = [];
+
+    /**
+     * construct
+     * 
+     * @param string $method
+     * @param array $arguments
+     * @return void
+     */
+    public function __construct($method, $arguments)
+    {
+        $this->method = $method;
+        $this->arguments = $arguments;
+    }
+
+    /**
+     * get
+     * 
+     * @param string $name
+     * @return mixed
+     */
+    public function __get($name)
+    {
+        $method = 'get' . ucfirst($name);
+
+        if (method_exists($this, $method)) {
+            return call_user_func_array([$this, $method], []);
+        }
+    }
+
+    /**
+     * set
+     * 
+     * @param string $name
+     * @param mixed $value
+     * @return bool
+     */
+    public function __set($name, $value)
+    {
+        $method = 'set' . ucfirst($name);
+
+        if (method_exists($this, $method)) {
+            return call_user_func_array([$this, $method], [$value]);
+        }
+        return false;
+    }
+
+    /**
+     * __toString
+     * 
+     * @return array
+     */
+    public function __toString()
+    {
+        $payload = $this->toPayload();
+
+        return json_encode($payload);
+    }
+
+    /**
+     * setId
+     * 
+     * @param int $id
+     * @return bool
+     */
+    public function setId($id)
+    {
+        if (!is_int($id)) {
+            throw new InvalidArgumentException('Id must be integer.');
+        }
+        $this->id = $id;
+
+        return true;
+    }
+
+    /**
+     * getId
+     * 
+     * @return int
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * getRpcVersion
+     * 
+     * @return string
+     */
+    public function getRpcVersion()
+    {
+        return $this->rpcVersion;
+    }
+
+    /**
+     * getMethod
+     * 
+     * @return string
+     */
+    public function getMethod()
+    {
+        return $this->method;
+    }
+
+    /**
+     * setArguments
+     * 
+     * @param array $arguments
+     * @return array
+     */
+    public function setArguments($arguments)
+    {
+        if (!is_array($arguments)) {
+            throw new InvalidArgumentException('Please use array when call setArguments.');
+        }
+        $this->arguments = $arguments;
+    }
+
+    /**
+     * getArguments
+     * 
+     * @return array
+     */
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+
+    /**
+     * toPayload
+     * 
+     * @return array
+     */
+    public function toPayload()
+    {
+        if (empty($this->method) || !is_string($this->method)) {
+            throw new InvalidArgumentException('Please check the method set properly.');
+        }
+        if (empty($this->id)) {
+            $id = rand();
+        } else {
+            $id = $this->id;
+        }
+        $rpc = [
+            'id' => $id,
+            'jsonrpc' => $this->rpcVersion,
+            'method' => $this->method
+        ];
+
+        if (count($this->arguments) > 0) {
+            $rpc['params'] = $this->arguments;
+        }
+        return $rpc;
+    }
+
+    /**
+     * toPayloadString
+     * 
+     * @return string
+     */
+    public function toPayloadString()
+    {
+        $payload = $this->toPayload();
+
+        return json_encode($payload);
+    }
+}
\ No newline at end of file
diff --git a/src/Methods/Web3/ClientVersion.php b/src/Methods/Web3/ClientVersion.php
new file mode 100644
index 0000000..d044265
--- /dev/null
+++ b/src/Methods/Web3/ClientVersion.php
@@ -0,0 +1,89 @@
+<?php
+
+/**
+ * This file is part of web3.php package.
+ * 
+ * (c) Kuan-Cheng,Lai <alk03073135@gmail.com>
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
+namespace Web3\Methods\Web3;
+
+use InvalidArgumentException;
+use Web3\Methods\IMethod;
+use Web3\Methods\JSONRPC;
+
+class ClientVersion extends JSONRPC implements IMethod
+{
+    /**
+     * inputFormatters
+     * 
+     * @var array
+     */
+    protected $inputFormatters = [
+    ];
+
+    /**
+     * outputFormatters
+     * 
+     * @var array
+     */
+    protected $outputFormatters = [];
+
+    /**
+     * construct
+     * 
+     * @param string $method
+     * @param array $arguments
+     * @return void
+     */
+    // public function __construct($method='', $arguments=[])
+    // {
+    //     parent::__construct($method, $arguments);
+    // }
+
+    /**
+     * getInputFormatters
+     * 
+     * @return array
+     */
+    public function getInputFormatters()
+    {
+        return $this->inputFormatters;
+    }
+
+    /**
+     * getOutputFormatters
+     * 
+     * @return array
+     */
+    public function getOutputFormatters()
+    {
+        return $this->outputFormatters;
+    }
+
+    /**
+     * transform
+     * 
+     * @param array $params
+     * @param array $rules
+     * @return array
+     */
+    public function transform($params, $rules)
+    {
+        if (!is_array($params)) {
+            throw new InvalidArgumentException('Please use array params when call transform.');
+        }
+        if (!is_array($rules)) {
+            throw new InvalidArgumentException('Please use array rules when call transform.');
+        }
+        foreach ($params as $key => $param) {
+            if (isset($rules[$key])) {
+                $params[$key] = call_user_func([$rules[$key], 'format'], $param);
+            }
+        }
+        return $params;
+    }
+}
\ No newline at end of file
diff --git a/src/Methods/Web3/Sha3.php b/src/Methods/Web3/Sha3.php
new file mode 100644
index 0000000..a1d2fa0
--- /dev/null
+++ b/src/Methods/Web3/Sha3.php
@@ -0,0 +1,91 @@
+<?php
+
+/**
+ * This file is part of web3.php package.
+ * 
+ * (c) Kuan-Cheng,Lai <alk03073135@gmail.com>
+ * 
+ * @author Peter Lai <alk03073135@gmail.com>
+ * @license MIT
+ */
+
+namespace Web3\Methods\Web3;
+
+use InvalidArgumentException;
+use Web3\Methods\IMethod;
+use Web3\Methods\JSONRPC;
+use Web3\Formatters\HexFormatter;
+
+class Sha3 extends JSONRPC implements IMethod
+{
+    /**
+     * inputFormatters
+     * 
+     * @var array
+     */
+    protected $inputFormatters = [
+        HexFormatter::class
+    ];
+
+    /**
+     * outputFormatters
+     * 
+     * @var array
+     */
+    protected $outputFormatters = [];
+
+    /**
+     * construct
+     * 
+     * @param string $method
+     * @param array $arguments
+     * @return void
+     */
+    // public function __construct($method='', $arguments=[])
+    // {
+    //     parent::__construct($method, $arguments);
+    // }
+
+    /**
+     * getInputFormatters
+     * 
+     * @return array
+     */
+    public function getInputFormatters()
+    {
+        return $this->inputFormatters;
+    }
+
+    /**
+     * getOutputFormatters
+     * 
+     * @return array
+     */
+    public function getOutputFormatters()
+    {
+        return $this->outputFormatters;
+    }
+
+    /**
+     * transform
+     * 
+     * @param array $params
+     * @param array $rules
+     * @return array
+     */
+    public function transform($params, $rules)
+    {
+        if (!is_array($params)) {
+            throw new InvalidArgumentException('Please use array params when call transform.');
+        }
+        if (!is_array($rules)) {
+            throw new InvalidArgumentException('Please use array rules when call transform.');
+        }
+        foreach ($params as $key => $param) {
+            if (isset($rules[$key])) {
+                $params[$key] = call_user_func([$rules[$key], 'format'], $param);
+            }
+        }
+        return $params;
+    }
+}
\ No newline at end of file