diff --git a/src/Contracts/Ethabi.php b/src/Contracts/Ethabi.php
new file mode 100644
index 0000000..cb23c97
--- /dev/null
+++ b/src/Contracts/Ethabi.php
@@ -0,0 +1,87 @@
+<?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 Web3\Utils;
+
+class Ethabi
+{
+    /**
+     * construct
+     * 
+     * @return void
+     */
+    public function __contruct()
+    {
+        // 
+    }
+
+    /**
+     * 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;
+    }
+
+    /**
+     * encodeFunctionSignature
+     * 
+     * @param string|stdClass|array $functionName
+     * @return string
+     */
+    public function encodeFunctionSignature($functionName)
+    {
+        if (!is_string($functionName)) {
+            $functionName = Utils::jsonMethodToString($functionName);
+        }
+        return mb_substr(Utils::sha3($functionName), 0, 10);
+    }
+
+    /**
+     * encodeEventSignature
+     * 
+     * @param string|stdClass|array $functionName
+     * @return string
+     */
+    public function encodeEventSignature($functionName)
+    {
+        if (!is_string($functionName)) {
+            $functionName = Utils::jsonMethodToString($functionName);
+        }
+        return Utils::sha3($functionName);
+    }
+}
\ No newline at end of file
diff --git a/test/unit/EthabiTest.php b/test/unit/EthabiTest.php
new file mode 100644
index 0000000..4e0a9f6
--- /dev/null
+++ b/test/unit/EthabiTest.php
@@ -0,0 +1,97 @@
+<?php
+
+namespace Test\Unit;
+
+use InvalidArgumentException;
+use Test\TestCase;
+use Web3\Utils;
+use Web3\Contracts\Ethabi;
+
+class EthabiTest extends TestCase
+{
+    /**
+     * testJsonMethodString
+     * from GameToken approve function
+     * 
+     * @var string
+     */
+    protected $testJsonMethodString = '{
+      "constant": false,
+      "inputs": [
+        {
+          "name": "_spender",
+          "type": "address"
+        },
+        {
+          "name": "_value",
+          "type": "uint256"
+        }
+      ],
+      "name": "approve",
+      "outputs": [
+        {
+          "name": "success",
+          "type": "bool"
+        }
+      ],
+      "payable": false,
+      "stateMutability": "nonpayable",
+      "type": "function"
+    }';
+
+    /**
+     * abi
+     * 
+     * @var \Web3\Contracts\Ethabi
+     */
+    protected $abi;
+
+    /**
+     * setUp
+     * 
+     * @return void
+     */
+    public function setUp()
+    {
+        parent::setUp();
+        $this->abi = new Ethabi();
+    }
+
+    /**
+     * testEncodeFunctionSignature
+     * 
+     * @return void
+     */
+    public function testEncodeFunctionSignature()
+    {
+        $abi = $this->abi;
+        $str = $abi->encodeFunctionSignature('baz(uint32,bool)');
+
+        $this->assertEquals($str, '0xcdcd77c0');
+
+        $json = json_decode($this->testJsonMethodString);
+        $methodString = Utils::jsonMethodToString($json);
+        $str = $abi->encodeFunctionSignature($methodString);
+
+        $this->assertEquals($str, '0x095ea7b3');
+    }
+
+    /**
+     * testEncodeEventSignature
+     * 
+     * @return void
+     */
+    public function testEncodeEventSignature()
+    {
+        $abi = $this->abi;
+        $str = $abi->encodeEventSignature('baz(uint32,bool)');
+
+        $this->assertEquals($str, '0xcdcd77c0992ec5bbfc459984220f8c45084cc24d9b6efed1fae540db8de801d2');
+
+        $json = json_decode($this->testJsonMethodString);
+        $methodString = Utils::jsonMethodToString($json);
+        $str = $abi->encodeEventSignature($methodString);
+
+        $this->assertEquals($str, '0x095ea7b334ae44009aa867bfb386f5c3b4b443ac6f0ee573fa91c4608fbadfba');
+    }
+}
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