diff --git a/src/RequestManagers/HttpRequestManager.php b/src/RequestManagers/HttpRequestManager.php
index 58028a9..767dd86 100644
--- a/src/RequestManagers/HttpRequestManager.php
+++ b/src/RequestManagers/HttpRequestManager.php
@@ -39,7 +39,7 @@ class HttpRequestManager extends RequestManager implements IRequestManager
     public function sendPayload($payload, $callback)
     {
         if (!is_string($payload)) {
-            throw new \RuntimeException('Payload must be string.');
+            throw new \InvalidArgumentException('Payload must be string.');
         }
         // $promise = $this->client->postAsync($this->host, [
         //     'headers' => [
@@ -67,8 +67,7 @@ class HttpRequestManager extends RequestManager implements IRequestManager
             $json = json_decode($res->getBody());
 
             if (JSON_ERROR_NONE !== json_last_error()) {
-                throw new \InvalidArgumentException(
-                    'json_decode error: ' . json_last_error_msg());
+                throw new \InvalidArgumentException('json_decode error: ' . json_last_error_msg());
             }
 
             call_user_func($callback, null, $json);
diff --git a/src/Web3.php b/src/Web3.php
index 7aab499..d84b78a 100644
--- a/src/Web3.php
+++ b/src/Web3.php
@@ -68,7 +68,7 @@ class Web3
                 $callback = array_pop($arguments);
 
                 if (is_callable($callback) !== true) {
-                    throw new \RuntimeException('The last param must be callback function.');
+                    throw new \InvalidArgumentException('The last param must be callback function.');
                 }
                 $this->provider->send($method, $arguments, $callback);
             }