diff --git a/src/Validators/PostValidator.php b/src/Validators/PostValidator.php
new file mode 100644
index 0000000..fc38e22
--- /dev/null
+++ b/src/Validators/PostValidator.php
@@ -0,0 +1,66 @@
+<?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\Validators;
+
+use Web3\Validators\IValidator;
+use Web3\Validators\QuantityValidator;
+use Web3\Validators\HexValidator;
+use Web3\Validators\IdentityValidator;
+
+class PostValidator
+{
+    /**
+     * validate
+     *
+     * @param array $value
+     * @return bool
+     */
+    public static function validate($value)
+    {
+        if (!is_array($value)) {
+            return false;
+        }
+        if (isset($value['from']) && IdentityValidator::validate($value['from']) === false) {
+            return false;
+        }
+        if (isset($value['to']) && IdentityValidator::validate($value['to']) === false) {
+            return false;
+        }
+        if (!isset($value['topics']) || !is_array($value['topics'])) {
+            return false;
+        }
+        foreach ($value['topics'] as $topic) {
+            if (IdentityValidator::validate($topic) === false) {
+                return false;
+            }
+        }
+        if (!isset($value['payload'])) {
+            return false;
+        }
+        if (HexValidator::validate($value['payload']) === false) {
+            return false;
+        }
+        if (!isset($value['priority'])) {
+            return false;
+        }
+        if (QuantityValidator::validate($value['priority']) === false) {
+            return false;
+        }
+        if (!isset($value['ttl'])) {
+            return false;
+        }
+        if (isset($value['ttl']) && QuantityValidator::validate($value['ttl']) === false) {
+            return false;
+        }
+        return true;
+    }
+}
\ No newline at end of file