diff --git a/src/Contracts/TypedDataEncoder.php b/src/Contracts/TypedDataEncoder.php
new file mode 100644
index 00000000..77ff9db6
--- /dev/null
+++ b/src/Contracts/TypedDataEncoder.php
@@ -0,0 +1,297 @@
+<?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\Contracts;
+
+use InvalidArgumentException;
+use stdClass;
+use Web3\Utils;
+use Web3\Formatters\IntegerFormatter;
+use Web3\Contracts\Ethabi;
+use Web3\Contracts\Types\Address;
+use Web3\Contracts\Types\Boolean;
+use Web3\Contracts\Types\Bytes;
+use Web3\Contracts\Types\DynamicBytes;
+use Web3\Contracts\Types\Integer;
+use Web3\Contracts\Types\Str;
+use Web3\Contracts\Types\Uinteger;
+
+class TypedDataEncoder
+{
+    /**
+     * ethabi
+     * 
+     * @var \Web3\Contracts\Ethabi
+     */
+    protected $ethabi;
+
+    /**
+     * 
+     */
+    protected $eip712SolidityTypes = [
+        'bool', 'address', 'string', 'bytes', 'uint', 'int',
+        'int8', 'int16', 'int24', 'int32', 'int40', 'int48', 'int56', 'int64', 'int72', 'int80', 'int88', 'int96', 'int104', 'int112', 'int120', 'int128', 'int136', 'int144', 'int152', 'int160', 'int168', 'int176', 'int184', 'int192', 'int200', 'int208', 'int216', 'int224', 'int232', 'int240', 'int248', 'int256',
+        'uint8', 'uint16', 'uint24', 'uint32', 'uint40', 'uint48', 'uint56', 'uint64', 'uint72', 'uint80', 'uint88', 'uint96', 'uint104', 'uint112', 'uint120', 'uint128', 'uint136', 'uint144', 'uint152', 'uint160', 'uint168', 'uint176', 'uint184', 'uint192', 'uint200', 'uint208', 'uint216', 'uint224', 'uint232', 'uint240', 'uint248', 'uint256',
+        'bytes1', 'bytes2', 'bytes3', 'bytes4', 'bytes5', 'bytes6', 'bytes7', 'bytes8', 'bytes9', 'bytes10', 'bytes11', 'bytes12', 'bytes13', 'bytes14', 'bytes15', 'bytes16', 'bytes17', 'bytes18', 'bytes19', 'bytes20', 'bytes21', 'bytes22', 'bytes23', 'bytes24', 'bytes25', 'bytes26', 'bytes27', 'bytes28', 'bytes29', 'bytes30', 'bytes31', 'bytes32'
+    ];
+
+    /**
+     * construct
+     * 
+     * @return void
+     */
+    public function __construct()
+    {
+        $this->ethabi = new Ethabi([
+            'address' => new Address,
+            'bool' => new Boolean,
+            'bytes' => new Bytes,
+            'dynamicBytes' => new DynamicBytes,
+            'int' => new Integer,
+            'string' => new Str,
+            'uint' => new Uinteger,
+        ]);
+    }
+
+    /**
+     * 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], []);
+        }
+        return false;
+    }
+
+    /**
+     * set
+     * 
+     * @param string $name
+     * @param mixed $value
+     * @return mixed
+     */
+    public function __set($name, $value)
+    {
+        $method = 'set' . ucfirst($name);
+
+        if (method_exists($this, $method)) {
+            return call_user_func_array([$this, $method], [$value]);
+        }
+        return false;
+    }
+
+    /**
+     * callStatic
+     * 
+     * @param string $name
+     * @param array $arguments
+     * @return void
+     */
+    public static function __callStatic($name, $arguments)
+    {}
+
+    /**
+     * encode
+     * 
+     * @return bool
+     */
+    function encode()
+    {
+        return '';
+    }
+
+    /**
+     * encodeField
+     * 
+     * @param array $types
+     * @param string $name
+     * @param string $type
+     * @param mixed $value
+     * @return bool
+     */
+    function encodeField(array $types, string $name, string $type, mixed $value)
+    {
+        return '';
+    }
+
+    /**
+     * strEndsWith
+     * 
+     * @param string $haystack
+     * @param string $needle
+     * @return bool
+     */
+    function strEndsWith(string $haystack, string $needle)
+    {
+        $needle_len = strlen($needle);
+        return ($needle_len === 0 || 0 === substr_compare($haystack, $needle, - $needle_len));
+    }
+
+    /**
+     * findType
+     * 
+     * @param string $type
+     * @param array $types
+     * @return string
+     */
+    protected function findType(string $type, array $types)
+    {
+        $result = [];
+        if ($this->strEndsWith($type, ']')) {
+            $pos = strpos($type, '[');
+            $type = ($pos !== false) ? substr($type, 0, $pos) : $typs;
+        }
+        if (in_array($type, $this->eip712SolidityTypes) || in_array($type, $result)) {
+            return $result;
+        } else if (!array_key_exists($type, $types)) {
+            throw new InvalidArgumentException('No definition of type ' . $type);
+        }
+
+        $result[] = $type;
+        foreach ($types[$type] as $field) {
+            $subResult = $this->findType($field['type'], $types);
+            if (count($subResult) > 0) {
+                $result = array_merge($result, $subResult);
+            }
+        }
+        return $result;
+    }
+
+    /**
+     * encodeType
+     * 
+     * @param string $type
+     * @param array $types
+     * @return string
+     */
+    protected function encodeType(string $type, array $types)
+    {
+        $result = '';
+        $unsortedDeps = $this->findType($type, $types);
+        if (in_array($type, $unsortedDeps)) {
+            $unsortedDeps = array_splice($unsortedDeps, array_search($type, $unsortedDeps), 1);
+        } else {
+            sort($unsortedDeps);
+        }
+        $deps = [ $type ];
+        $deps = array_merge($unsortedDeps);
+        foreach ($deps as $type) {
+            $params = [];
+            foreach ($types[$type] as $param) {
+                $params[] = $param['type'] . ' ' . $param['name'];
+            }
+            $result .= $type . '(' . implode(',', $params) . ')';
+        }
+        return $result;
+    }
+
+    /**
+     * hashType
+     * 
+     * @param string $type
+     * @param array $types
+     * @return string
+     */
+    protected function hashType(string $type, array $types)
+    {
+        $encodedType = $this->encodeType($type, $types);
+        return Utils::sha3($encodedType);
+    }
+
+    /**
+     * encodeData
+     * 
+     * @param string $type
+     * @param array $types
+     * @param array $data
+     * @return string
+     */
+    protected function encodeData(string $type, array $types, array $data)
+    {
+        $encodedTypes = ['bytes32'];
+        $encodedValues = [$this->hashType($type, $types)];
+        var_dump($this->hashType($type, $types));
+        return 'zz';
+    }
+
+    /**
+     * hashStruct
+     * 
+     * @param string $type
+     * @param array $types
+     * @param array $data
+     * @return string
+     */
+    protected function hashStruct(string $type, array $types, array $data)
+    {
+        $encodedData = $this->encodeData($type, $types, $data);
+        return Utils::sha3($encodedData);
+    }
+
+    /**
+     * hashEIP712Message
+     * 
+     * @param array $types
+     * @param array $message
+     * @return 
+     */
+    public function hashEIP712Message(array $types, array $message)
+    {}
+
+    /**
+     * hashDomain
+     * 
+     * @param array $domain
+     * @return string
+     */
+    public function hashDomain(array $domainData)
+    {
+        $eip721Domain = [
+            'name' => [
+                'name' => 'name',
+                'type' => 'string'
+            ],
+            'version' => [
+                'name' => 'version',
+                'type' => 'string'
+            ],
+            'chainId' => [
+                'name' => 'chainId',
+                'type' => 'uint256'
+            ],
+            'verifyingContract' => [
+                'name' => 'verifyingContract',
+                'type' => 'address'
+            ],
+            'salt' => [
+                'name' => 'salt',
+                'type' => 'bytes32'
+            ]
+        ];
+        $domainTypes = [
+            'EIP712Domain' => []
+        ];
+        foreach ($domainData as $key => $data) {
+            if (!array_key_exists($key, $eip721Domain)) {
+                throw new InvalidArgumentException('Invalid domain key: ' + $key);
+            } else {
+                $domainTypes['EIP712Domain'][] = $eip721Domain[$key];
+            }
+        }
+        return $this->hashStruct('EIP712Domain', $domainTypes, $domainData);
+    }
+}
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