diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 7701ad57..276a9a3d 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -7,7 +7,7 @@ jobs:
     name: Build and test web3.php with ${{ matrix.php-version }}
     strategy:
       matrix:
-        php-version: ["7.3", "7.4", "8.0"]
+        php-version: ["7.3", "7.4", "8.0", "8.1", "8.2"]
 
     runs-on: ubuntu-latest
 
diff --git a/composer.json b/composer.json
index e03dcef0..b58bfda9 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,12 @@
         "PHP": "^7.2|^8.0",
         "kornrunner/keccak": "~1.0",
         "phpseclib/phpseclib": "~2.0.30",
-        "ext-mbstring": "*"
+        "ext-mbstring": "*",
+        "react/http": "^1.6.0",
+        "react/async": "^4.0.0|^3.1.0",
+        "react/promise": "^2.9.0",
+        "react/event-loop": "^1.2",
+        "react/socket": "^1.13"
     },
     "require-dev": {
         "phpunit/phpunit": "~8.0|~9.0"
diff --git a/docker/ganache/Dockerfile b/docker/ganache/Dockerfile
index 17726d6d..5f99bb9f 100644
--- a/docker/ganache/Dockerfile
+++ b/docker/ganache/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:9.11.1-alpine
+FROM node:12.11.1-alpine
 
 MAINTAINER Peter Lai <alk03073135@gmail.com>
 
diff --git a/docker/php/Dockerfile-71 b/docker/php/Dockerfile-81
similarity index 93%
rename from docker/php/Dockerfile-71
rename to docker/php/Dockerfile-81
index 0df7a269..ded44c5b 100644
--- a/docker/php/Dockerfile-71
+++ b/docker/php/Dockerfile-81
@@ -1,4 +1,4 @@
-FROM php:7.1-alpine
+FROM php:8.1-alpine
 
 MAINTAINER Peter Lai <alk03073135@gmail.com>
 
@@ -20,4 +20,4 @@ RUN php composer-setup.php && \
     php composer-setup.php --install-dir=/usr/bin --filename=composer && \
     php -r "unlink('composer-setup.php');"
 
-WORKDIR /app
\ No newline at end of file
+WORKDIR /app
diff --git a/docker/php/Dockerfile-82 b/docker/php/Dockerfile-82
new file mode 100644
index 00000000..4483817a
--- /dev/null
+++ b/docker/php/Dockerfile-82
@@ -0,0 +1,23 @@
+FROM php:8.2-alpine
+
+MAINTAINER Peter Lai <alk03073135@gmail.com>
+
+COPY composer-setup.php composer-setup.php
+# COPY php.ini-production $PHP_INI_DIR/php.ini
+
+RUN apk update && \
+    apk add git
+
+# Install gmp
+Run apk add gmp-dev && \
+    docker-php-ext-install gmp
+
+# Install nodejs
+# Run apk add --update nodejs nodejs-npm
+
+# Install composer
+RUN php composer-setup.php && \
+    php composer-setup.php --install-dir=/usr/bin --filename=composer && \
+    php -r "unlink('composer-setup.php');"
+
+WORKDIR /app
diff --git a/src/Contract.php b/src/Contract.php
index 87ad1fc4..ba5c51ea 100644
--- a/src/Contract.php
+++ b/src/Contract.php
@@ -441,7 +441,7 @@ public function abi($abi)
      * Deploy a contruct with params.
      * 
      * @param mixed
-     * @return void
+     * @return void|\React\Promise\PromiseInterface
      */
     public function new()
     {
@@ -469,7 +469,7 @@ public function new()
             }
             $transaction['data'] = '0x' . $this->bytecode . Utils::stripZero($data);
 
-            $this->eth->sendTransaction($transaction, function ($err, $transaction) use ($callback){
+            return $this->eth->sendTransaction($transaction, function ($err, $transaction) use ($callback){
                 if ($err !== null) {
                     return call_user_func($callback, $err, null);
                 }
@@ -483,7 +483,7 @@ public function new()
      * Send function method.
      * 
      * @param mixed
-     * @return void
+     * @return void|\React\Promise\PromiseInterface
      */
     public function send()
     {
@@ -564,7 +564,7 @@ public function send()
             $transaction['to'] = $this->toAddress;
             $transaction['data'] = $functionSignature . Utils::stripZero($data);
 
-            $this->eth->sendTransaction($transaction, function ($err, $transaction) use ($callback){
+            return $this->eth->sendTransaction($transaction, function ($err, $transaction) use ($callback){
                 if ($err !== null) {
                     return call_user_func($callback, $err, null);
                 }
@@ -578,7 +578,7 @@ public function send()
      * Call function method.
      *
      * @param mixed
-     * @return void
+     * @return void|\React\Promise\PromiseInterface
      */
     public function call()
     {
@@ -658,7 +658,7 @@ public function call()
             $transaction['to'] = $this->toAddress;
             $transaction['data'] = $functionSignature . Utils::stripZero($data);
 
-            $this->eth->call($transaction, $defaultBlock, function ($err, $transaction) use ($callback, $function){
+            return $this->eth->call($transaction, $defaultBlock, function ($err, $transaction) use ($callback, $function){
                 if ($err !== null) {
                     return call_user_func($callback, $err, null);
                 }
@@ -674,7 +674,7 @@ public function call()
      * Estimate function gas.
      * 
      * @param mixed
-     * @return void
+     * @return void|\React\Promise\PromiseInterface
      */
     public function estimateGas()
     {
@@ -778,7 +778,7 @@ public function estimateGas()
                 $transaction['data'] = $functionSignature . Utils::stripZero($data);
             }
 
-            $this->eth->estimateGas($transaction, function ($err, $gas) use ($callback) {
+            return $this->eth->estimateGas($transaction, function ($err, $gas) use ($callback) {
                 if ($err !== null) {
                     return call_user_func($callback, $err, null);
                 }
diff --git a/src/Eth.php b/src/Eth.php
index 78d97989..022aaa7b 100644
--- a/src/Eth.php
+++ b/src/Eth.php
@@ -66,7 +66,7 @@ public function __construct($provider)
      * 
      * @param string $name
      * @param array $arguments
-     * @return void
+     * @return void|\React\Promise\PromiseInterface
      */
     public function __call($name, $arguments)
     {
@@ -102,7 +102,7 @@ public function __call($name, $arguments)
             if ($methodObject->validate($arguments)) {
                 $inputs = $methodObject->transform($arguments, $methodObject->inputFormatters);
                 $methodObject->arguments = $inputs;
-                $this->provider->send($methodObject, $callback);
+                return $this->provider->send($methodObject, $callback);
             }
         }
     }
diff --git a/src/Methods/Eth/CompileLLL.php b/src/Methods/Eth/CompileLLL.php
deleted file mode 100644
index 69d33f6a..00000000
--- a/src/Methods/Eth/CompileLLL.php
+++ /dev/null
@@ -1,64 +0,0 @@
-<?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\Eth;
-
-use InvalidArgumentException;
-use Web3\Methods\EthMethod;
-use Web3\Validators\StringValidator;
-use Web3\Formatters\StringFormatter;
-
-class CompileLLL extends EthMethod
-{
-    /**
-     * validators
-     * 
-     * @var array
-     */
-    protected $validators = [
-        StringValidator::class
-    ];
-
-    /**
-     * inputFormatters
-     * 
-     * @var array
-     */
-    protected $inputFormatters = [
-        StringFormatter::class
-    ];
-
-    /**
-     * outputFormatters
-     * 
-     * @var array
-     */
-    protected $outputFormatters = [];
-
-    /**
-     * defaultValues
-     * 
-     * @var array
-     */
-    protected $defaultValues = [];
-
-    /**
-     * construct
-     * 
-     * @param string $method
-     * @param array $arguments
-     * @return void
-     */
-    // public function __construct($method='', $arguments=[])
-    // {
-    //     parent::__construct($method, $arguments);
-    // }
-}
\ No newline at end of file
diff --git a/src/Methods/Eth/CompileSerpent.php b/src/Methods/Eth/CompileSerpent.php
deleted file mode 100644
index 39b105d2..00000000
--- a/src/Methods/Eth/CompileSerpent.php
+++ /dev/null
@@ -1,64 +0,0 @@
-<?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\Eth;
-
-use InvalidArgumentException;
-use Web3\Methods\EthMethod;
-use Web3\Validators\StringValidator;
-use Web3\Formatters\StringFormatter;
-
-class CompileSerpent extends EthMethod
-{
-    /**
-     * validators
-     * 
-     * @var array
-     */
-    protected $validators = [
-        StringValidator::class
-    ];
-
-    /**
-     * inputFormatters
-     * 
-     * @var array
-     */
-    protected $inputFormatters = [
-        StringFormatter::class
-    ];
-
-    /**
-     * outputFormatters
-     * 
-     * @var array
-     */
-    protected $outputFormatters = [];
-
-    /**
-     * defaultValues
-     * 
-     * @var array
-     */
-    protected $defaultValues = [];
-
-    /**
-     * construct
-     * 
-     * @param string $method
-     * @param array $arguments
-     * @return void
-     */
-    // public function __construct($method='', $arguments=[])
-    // {
-    //     parent::__construct($method, $arguments);
-    // }
-}
\ No newline at end of file
diff --git a/src/Methods/Eth/CompileSolidity.php b/src/Methods/Eth/CompileSolidity.php
deleted file mode 100644
index 05de3c0d..00000000
--- a/src/Methods/Eth/CompileSolidity.php
+++ /dev/null
@@ -1,64 +0,0 @@
-<?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\Eth;
-
-use InvalidArgumentException;
-use Web3\Methods\EthMethod;
-use Web3\Validators\StringValidator;
-use Web3\Formatters\StringFormatter;
-
-class CompileSolidity extends EthMethod
-{
-    /**
-     * validators
-     * 
-     * @var array
-     */
-    protected $validators = [
-        StringValidator::class
-    ];
-
-    /**
-     * inputFormatters
-     * 
-     * @var array
-     */
-    protected $inputFormatters = [
-        StringFormatter::class
-    ];
-
-    /**
-     * outputFormatters
-     * 
-     * @var array
-     */
-    protected $outputFormatters = [];
-
-    /**
-     * defaultValues
-     * 
-     * @var array
-     */
-    protected $defaultValues = [];
-
-    /**
-     * construct
-     * 
-     * @param string $method
-     * @param array $arguments
-     * @return void
-     */
-    // public function __construct($method='', $arguments=[])
-    // {
-    //     parent::__construct($method, $arguments);
-    // }
-}
\ No newline at end of file
diff --git a/src/Net.php b/src/Net.php
index bb06615d..adae1047 100644
--- a/src/Net.php
+++ b/src/Net.php
@@ -66,7 +66,7 @@ public function __construct($provider)
      * 
      * @param string $name
      * @param array $arguments
-     * @return void
+     * @return void|\React\Promise\PromiseInterface
      */
     public function __call($name, $arguments)
     {
@@ -102,7 +102,7 @@ public function __call($name, $arguments)
             if ($methodObject->validate($arguments)) {
                 $inputs = $methodObject->transform($arguments, $methodObject->inputFormatters);
                 $methodObject->arguments = $inputs;
-                $this->provider->send($methodObject, $callback);
+                return $this->provider->send($methodObject, $callback);
             }
         }
     }
diff --git a/src/Personal.php b/src/Personal.php
index 75aa200c..8b479776 100644
--- a/src/Personal.php
+++ b/src/Personal.php
@@ -66,7 +66,7 @@ public function __construct($provider)
      * 
      * @param string $name
      * @param array $arguments
-     * @return void
+     * @return void|\React\Promise\PromiseInterface
      */
     public function __call($name, $arguments)
     {
@@ -102,7 +102,7 @@ public function __call($name, $arguments)
             if ($methodObject->validate($arguments)) {
                 $inputs = $methodObject->transform($arguments, $methodObject->inputFormatters);
                 $methodObject->arguments = $inputs;
-                $this->provider->send($methodObject, $callback);
+                return $this->provider->send($methodObject, $callback);
             }
         }
     }
diff --git a/src/Providers/HttpProvider.php b/src/Providers/HttpProvider.php
index b99de556..05e4f366 100644
--- a/src/Providers/HttpProvider.php
+++ b/src/Providers/HttpProvider.php
@@ -59,7 +59,7 @@ public function send($method, $callback)
 
                 return call_user_func($callback, null, $res);
             };
-            $this->requestManager->sendPayload($payload, $proxy);
+            return $this->requestManager->sendPayload($payload, $proxy);
         } else {
             $this->methods[] = $method;
             $this->batch[] = $payload;
@@ -108,8 +108,9 @@ public function execute($callback)
             }
             return call_user_func($callback, null, $res);
         };
-        $this->requestManager->sendPayload('[' . implode(',', $this->batch) . ']', $proxy);
-        $this->methods[] = [];
+        $r = $this->requestManager->sendPayload('[' . implode(',', $this->batch) . ']', $proxy);
+        $this->methods = [];
         $this->batch = [];
+        return $r;
     }
 }
\ No newline at end of file
diff --git a/src/RequestManagers/HttpAsyncRequestManager.php b/src/RequestManagers/HttpAsyncRequestManager.php
new file mode 100644
index 00000000..0c655999
--- /dev/null
+++ b/src/RequestManagers/HttpAsyncRequestManager.php
@@ -0,0 +1,125 @@
+<?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\RequestManagers;
+
+use InvalidArgumentException;
+use Psr\Http\Message\StreamInterface;
+use RuntimeException as RPCException;
+use Psr\Http\Message\ResponseInterface;
+use React;
+use React\Async;
+use React\EventLoop\Loop;
+use React\Http\Browser;
+use React\Socket\Connector;
+use Web3\RequestManagers\RequestManager;
+use Web3\RequestManagers\IRequestManager;
+
+class HttpAsyncRequestManager extends RequestManager implements IRequestManager
+{
+    /**
+     * client
+     *
+     * @var \React\Http\Browser
+     */
+    protected $client;
+
+    /**
+     * construct
+     *
+     * @param string $host
+     * @param int $timeout
+     * @return void
+     */
+    public function __construct($host, $timeout = 1)
+    {
+        parent::__construct($host, $timeout);
+        $connector = new Connector([
+            'timeout' => $timeout,
+        ], Loop::get());
+        $this->client = (new Browser($connector, Loop::get()))->withRejectErrorResponse(false);
+    }
+
+    /**
+     * sendPayload
+     *
+     * @param string $payload
+     * @param callable $callback
+     * @return void
+     */
+    public function sendPayload($payload, $callback)
+    {
+        if (!is_string($payload)) {
+            throw new \InvalidArgumentException('Payload must be string.');
+        }
+
+        $host = $this->host;
+        $request = function () use ($host, $payload, $callback) {
+            try {
+                $headers = [
+                    'content-type' => 'application/json'
+                ];
+                $res = Async\await($this->client->request('POST', $host, $headers, $payload));
+                /**
+                 * @var StreamInterface $stream ;
+                 */
+                $stream = $res->getBody();
+                $json = json_decode($stream);
+                $stream->close();
+
+                if (JSON_ERROR_NONE !== json_last_error()) {
+                    call_user_func($callback, new InvalidArgumentException('json_decode error: ' . json_last_error_msg()), null);
+                }
+                if (is_array($json)) {
+                    // batch results
+                    $results = [];
+                    $errors = [];
+
+                    foreach ($json as $result) {
+                        if (property_exists($result,'result')) {
+                            $results[] = $result->result;
+                        } else {
+                            if (isset($json->error)) {
+                                $error = $json->error;
+                                $errors[] = new RPCException(mb_ereg_replace('Error: ', '', $error->message), $error->code);
+                            } else {
+                                $results[] = null;
+                            }
+                        }
+                    }
+                    if (count($errors) > 0) {
+                        call_user_func($callback, $errors, $results);
+                    } else {
+                        call_user_func($callback, null, $results);
+                    }
+                } elseif (property_exists($json,'result')) {
+                    call_user_func($callback, null, $json->result);
+                } else {
+                    if (isset($json->error)) {
+                        $error = $json->error;
+
+                        call_user_func($callback, new RPCException(mb_ereg_replace('Error: ', '', $error->message), $error->code), null);
+                    } else {
+                        call_user_func($callback, new RPCException('Something wrong happened.'), null);
+                    }
+                }
+            } catch (Exception $err) {
+                call_user_func($callback, $err, null);
+            }
+        };
+
+        if (function_exists('React\\Async\\async')) {
+            $request = Async\async($request);
+        }
+
+        return Async\coroutine($request);
+    }
+}
diff --git a/src/Shh.php b/src/Shh.php
index bc438e4b..ed38738b 100644
--- a/src/Shh.php
+++ b/src/Shh.php
@@ -67,7 +67,7 @@ public function __construct($provider)
      * 
      * @param string $name
      * @param array $arguments
-     * @return void
+     * @return void|\React\Promise\PromiseInterface
      */
     public function __call($name, $arguments)
     {
@@ -103,7 +103,7 @@ public function __call($name, $arguments)
             if ($methodObject->validate($arguments)) {
                 $inputs = $methodObject->transform($arguments, $methodObject->inputFormatters);
                 $methodObject->arguments = $inputs;
-                $this->provider->send($methodObject, $callback);
+                return $this->provider->send($methodObject, $callback);
             }
         }
     }
diff --git a/src/Web3.php b/src/Web3.php
index 35a2cded..4e489f77 100644
--- a/src/Web3.php
+++ b/src/Web3.php
@@ -142,7 +142,7 @@ public function __call($name, $arguments)
             if ($methodObject->validate($arguments)) {
                 $inputs = $methodObject->transform($arguments, $methodObject->inputFormatters);
                 $methodObject->arguments = $inputs;
-                $this->provider->send($methodObject, $callback);
+                return $this->provider->send($methodObject, $callback);
             }
         }
     }
diff --git a/test/TestCase.php b/test/TestCase.php
index 373a8b31..18d298e6 100644
--- a/test/TestCase.php
+++ b/test/TestCase.php
@@ -4,6 +4,8 @@
 
 use \PHPUnit\Framework\TestCase as BaseTestCase;
 use Web3\Web3;
+use Web3\RequestManagers\HttpAsyncRequestManager;
+use Web3\Providers\HttpProvider;
 
 class TestCase extends BaseTestCase
 {
@@ -15,11 +17,11 @@ class TestCase extends BaseTestCase
     protected $web3;
 
     /**
-     * testRinkebyHost
+     * testHost2
      * 
      * @var string
      */
-    protected $testRinkebyHost = 'https://rinkeby.infura.io/vuethexplore';
+    protected $testHost2 = 'https://eth-mainnet.g.alchemy.com/v2/notavalidkey';
 
     /**
      * testHost
@@ -35,6 +37,13 @@ class TestCase extends BaseTestCase
      */
     protected $coinbase;
 
+    /**
+     * asyncHttpProvider
+     * 
+     * @var \Web3\Providers\HttpProvider
+     */
+    protected $asyncHttpProvider;
+
     /**
      * setUp
      */
@@ -43,6 +52,10 @@ public function setUp(): void
         $web3 = new Web3($this->testHost);
         $this->web3 = $web3;
 
+        $asyncRequestManager = new HttpAsyncRequestManager($this->testHost);
+        $asyncHttpProvider = new HttpProvider($asyncRequestManager);
+        $this->asyncHttpProvider = $asyncHttpProvider;
+
         $web3->eth->coinbase(function ($err, $coinbase) {
             if ($err !== null) {
                 return $this->fail($err->getMessage());
diff --git a/test/unit/ContractTest.php b/test/unit/ContractTest.php
index 5061abc5..3d72bde4 100644
--- a/test/unit/ContractTest.php
+++ b/test/unit/ContractTest.php
@@ -21,6 +21,13 @@ class ContractTest extends TestCase
      */
     protected $contract;
 
+    /**
+     * async contract
+     *
+     * @var \Web3\Contract
+     */
+    protected $asyncContract;
+
     /**
      * testAbi
      * GameToken abi from https://github.com/sc0Vu/GameToken
@@ -425,6 +432,7 @@ public function setUp(): void
                 }
             }
         });
+        $this->asyncContract = new Contract($this->asyncHttpProvider, $this->testAbi);
     }
 
     /**
@@ -708,7 +716,7 @@ public function testEstimateGas()
         ], function ($err, $result) use ($contract) {
             if ($err !== null) {
                 // infura api gg
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             if (isset($result)) {
                 echo "\nEstimate gas: " . $result->toString() . "\n";
@@ -1514,4 +1522,117 @@ public function testIssue134()
             }
         });
     }
+
+    /**
+     * testAsync
+     * 
+     * @return void
+     */
+    public function testAsync()
+    {
+        $contract = $this->contract;
+
+        if (!isset($this->accounts[0])) {
+            $fromAccount = '0x407d73d8a49eeb85d32cf465507dd71d507100c1';
+        } else {
+            $fromAccount = $this->accounts[0];
+        }
+        if (!isset($this->accounts[1])) {
+            $toAccount = '0x407d73d8a49eeb85d32cf465507dd71d507100c2';
+        } else {
+            $toAccount = $this->accounts[1];
+        }
+        $contract->bytecode($this->testBytecode)->new(1000000, 'Game Token', 1, 'GT', [
+            'from' => $fromAccount,
+            'gas' => '0x200b20'
+        ], function ($err, $result) use ($contract) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            if ($result) {
+                echo "\nTransaction has made:) id: " . $result . "\n";
+            }
+            $transactionId = $result;
+            $this->assertTrue((preg_match('/^0x[a-f0-9]{64}$/', $transactionId) === 1));
+
+            $contract->eth->getTransactionReceipt($transactionId, function ($err, $transaction) {
+                if ($err !== null) {
+                    return $this->fail($err);
+                }
+                if ($transaction) {
+                    $this->contractAddress = $transaction->contractAddress;
+                    echo "\nTransaction has mined:) block number: " . $transaction->blockNumber . "\n";
+                }
+            });
+        });
+
+        if (!isset($this->contractAddress)) {
+            $this->contractAddress = '0x407d73d8a49eeb85d32cf465507dd71d507100c2';
+        }
+        $asyncContract = $this->asyncContract;
+        $promise1 = $asyncContract->at($this->contractAddress)->send('transfer', $toAccount, 16, [
+            'from' => $fromAccount,
+            'gas' => '0x200b20'
+        ], function ($err, $result) use ($contract, $fromAccount, $toAccount, $asyncContract) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            if ($result) {
+                echo "\nTransaction has made:) id: " . $result . "\n";
+            }
+            $transactionId = $result;
+            $this->assertTrue((preg_match('/^0x[a-f0-9]{64}$/', $transactionId) === 1));
+
+            $promise = $asyncContract->eth->getTransactionReceipt($transactionId, function ($err, $transaction) use ($fromAccount, $toAccount, $contract) {
+                if ($err !== null) {
+                    return $this->fail($err);
+                }
+                if ($transaction) {
+                    $topics = $transaction->logs[0]->topics;
+                    echo "\nTransaction has mined:) block number: " . $transaction->blockNumber . "\n";
+
+                    // validate topics
+                    $this->assertEquals($contract->ethabi->encodeEventSignature($this->contract->events['Transfer']), $topics[0]);
+                    $this->assertEquals('0x' . IntegerFormatter::format($fromAccount), $topics[1]);
+                    $this->assertEquals('0x' . IntegerFormatter::format($toAccount), $topics[2]);
+                }
+            });
+            $this->assertTrue($promise instanceof \React\Promise\PromiseInterface);
+            \React\Async\await($promise);
+        });
+        $this->assertTrue($promise1 instanceof \React\Promise\PromiseInterface);
+
+        $promise2 = $asyncContract->at($this->contractAddress)->call('balanceOf', $fromAccount, [
+            'from' => $fromAccount
+        ], function ($err, $result) use ($contract) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            if (isset($result)) {
+                // $bn = Utils::toBn($result);
+                // $this->assertEquals($bn->toString(), '10000', 'Balance should be 10000.');
+                $this->assertTrue($result !== null);
+            }
+        });
+
+        $this->assertTrue($promise2 instanceof \React\Promise\PromiseInterface);
+
+        $promise3 = $asyncContract->bytecode($this->testBytecode)->estimateGas('balanceOf', $toAccount, [
+            'from' => $fromAccount,
+            'gas' => '0x200b20'
+        ], function ($err, $result) use ($contract) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            if (isset($result)) {
+                echo "\nEstimate gas: " . $result->toString() . "\n";
+                $this->assertTrue($result !== null);
+            }
+        });
+        \React\Async\await(\React\Async\parallel([
+            function () use ($promise1) { return $promise1; },
+            function () use ($promise2) { return $promise2; },
+            function () use ($promise3) { return $promise3; },
+        ]));
+    }
 }
\ No newline at end of file
diff --git a/test/unit/EthApiTest.php b/test/unit/EthApiTest.php
index 2f58bc45..e1d2a4c2 100644
--- a/test/unit/EthApiTest.php
+++ b/test/unit/EthApiTest.php
@@ -227,7 +227,7 @@ public function testGetBlockTransactionCountByHash()
 
         $eth->getBlockTransactionCountByHash('0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238', function ($err, $transactionCount) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->assertEquals('Key not found in database', $err->getMessage());
             }
             $this->assertTrue(is_numeric($transactionCount->toString()));
         });
@@ -244,7 +244,7 @@ public function testGetBlockTransactionCountByNumber()
 
         $eth->getBlockTransactionCountByNumber('0x0', function ($err, $transactionCount) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_numeric($transactionCount->toString()));
         });
@@ -261,7 +261,7 @@ public function testGetUncleCountByBlockHash()
 
         $eth->getUncleCountByBlockHash('0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238', function ($err, $uncleCount) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_numeric($uncleCount->toString()));
         });
@@ -278,7 +278,7 @@ public function testGetUncleCountByBlockNumber()
 
         $eth->getUncleCountByBlockNumber('0x0', function ($err, $uncleCount) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_numeric($uncleCount->toString()));
         });
@@ -295,7 +295,7 @@ public function testGetCode()
 
         $eth->getCode('0x407d73d8a49eeb85d32cf465507dd71d507100c1', function ($err, $code) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_string($code));
         });
@@ -312,8 +312,7 @@ public function testSign()
 
         $eth->sign('0x407d73d8a49eeb85d32cf465507dd71d507100c1', '0xdeadbeaf', function ($err, $sign) {
             if ($err !== null) {
-                // infura banned us to sign message
-                return $this->assertTrue($err !== null);
+                return $this->assertEquals('cannot sign data; no private key', $err->getMessage());
             }
             $this->assertTrue(is_string($sign));
         });
@@ -337,8 +336,7 @@ public function testSendTransaction()
             'data' => "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
         ], function ($err, $transaction) {
             if ($err !== null) {
-                // infura banned us to send transaction
-                return $this->assertTrue($err !== null);
+                return $this->assertEquals('sender account not recognized', $err->getMessage());
             }
             $this->assertTrue(is_string($transaction));
         });
@@ -355,7 +353,7 @@ public function testSendRawTransaction()
 
         $eth->sendRawTransaction('0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675', function ($err, $transaction) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->assertEquals('invalid remainder', $err->getMessage());
             }
             $this->assertTrue(is_string($transaction));
         });
@@ -379,7 +377,7 @@ public function testCall()
             'data' => "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
         ], function ($err, $transaction) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_string($transaction));
         });
@@ -403,7 +401,7 @@ public function testEstimateGas()
             'data' => "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
         ], function ($err, $gas) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_numeric($gas->toString()));
         });
@@ -420,7 +418,7 @@ public function testGetBlockByHash()
 
         $eth->getBlockByHash('0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238', false, function ($err, $block) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->assertEquals('Key not found in database', $err->getMessage());
             }
             $this->assertTrue($block !== null);
         });
@@ -437,7 +435,7 @@ public function testGetBlockByNumber()
 
         $eth->getBlockByNumber('latest', false, function ($err, $block) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             // weird behavior, see https://github.com/web3p/web3.php/issues/16
             $this->assertTrue($block !== null);
@@ -455,7 +453,7 @@ public function testGetTransactionByHash()
 
         $eth->getTransactionByHash('0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238', function ($err, $transaction) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue($transaction == null);
         });
@@ -472,7 +470,7 @@ public function testGetTransactionByBlockHashAndIndex()
 
         $eth->getTransactionByBlockHashAndIndex('0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238', '0x0', function ($err, $transaction) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue($transaction == null);
         });
@@ -489,7 +487,7 @@ public function testGetTransactionByBlockNumberAndIndex()
 
         $eth->getTransactionByBlockNumberAndIndex('0xe8', '0x0', function ($err, $transaction) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->assertStringStartsWith('LevelUpArrayAdapter named \'blocks\' index out of range', $err->getMessage());
             }
             $this->assertTrue($transaction !== null);
         });
@@ -506,7 +504,7 @@ public function testGetTransactionReceipt()
 
         $eth->getTransactionReceipt('0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238', function ($err, $transaction) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue($transaction == null);
         });
@@ -523,7 +521,7 @@ public function testGetUncleByBlockHashAndIndex()
 
         $eth->getUncleByBlockHashAndIndex('0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238', '0x0', function ($err, $uncle) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue($uncle !== null);
         });
@@ -540,63 +538,12 @@ public function testGetUncleByBlockNumberAndIndex()
 
         $eth->getUncleByBlockNumberAndIndex('0xe8', '0x0', function ($err, $uncle) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue($uncle !== null);
         });
     }
 
-    /**
-     * testCompileSolidity
-     * 
-     * @return void
-     */    
-    public function testCompileSolidity()
-    {
-        $eth = $this->eth;
-
-        $eth->compileSolidity('contract test { function multiply(uint a) returns(uint d) {   return a * 7;   } }', function ($err, $compiled) {
-            if ($err !== null) {
-                return $this->assertTrue($err !== null);
-            }
-            $this->assertTrue(is_string($compiled));
-        });
-    }
-
-    /**
-     * testCompileLLL
-     * 
-     * @return void
-     */    
-    public function testCompileLLL()
-    {
-        $eth = $this->eth;
-
-        $eth->compileLLL('(returnlll (suicide (caller)))', function ($err, $compiled) {
-            if ($err !== null) {
-                return $this->assertTrue($err !== null);
-            }
-            $this->assertTrue(is_string($compiled));
-        });
-    }
-
-    /**
-     * testCompileSerpent
-     * 
-     * @return void
-     */    
-    public function testCompileSerpent()
-    {
-        $eth = $this->eth;
-
-        $eth->compileSerpent('\/* some serpent *\/', function ($err, $compiled) {
-            if ($err !== null) {
-                return $this->assertTrue($err !== null);
-            }
-            $this->assertTrue(is_string($compiled));
-        });
-    }
-
     /**
      * testNewFilter
      * 
@@ -614,7 +561,7 @@ public function testNewFilter()
         ], function ($err, $filter) {
             if ($err !== null) {
                 // infura banned us to new filter
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_string($filter));
         });
@@ -632,7 +579,7 @@ public function testNewBlockFilter()
         $eth->newBlockFilter(function ($err, $filter) {
             if ($err !== null) {
                 // infura banned us to new block filter
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_string($filter));
         });
@@ -650,7 +597,7 @@ public function testNewPendingTransactionFilter()
         $eth->newPendingTransactionFilter(function ($err, $filter) {
             if ($err !== null) {
                 // infura banned us to new pending transaction filter
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_string($filter));
         });
@@ -668,7 +615,7 @@ public function testUninstallFilter()
         $eth->uninstallFilter('0x01', function ($err, $filter) {
             if ($err !== null) {
                 // infura banned us to uninstall filter
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_bool($filter));
         });
@@ -686,7 +633,7 @@ public function testGetFilterChanges()
         $eth->getFilterChanges('0x01', function ($err, $changes) {
             if ($err !== null) {
                 // infura banned us to get filter changes
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_array($changes));
         });
@@ -704,7 +651,7 @@ public function testGetFilterLogs()
         $eth->getFilterLogs('0x01', function ($err, $logs) {
             if ($err !== null) {
                 // infura banned us to get filter logs
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_array($logs));
         });
@@ -726,68 +673,73 @@ public function testGetLogs()
             'topics' => ['0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b', null, ['0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b', '0x0000000000000000000000000aff3454fce5edbc8cca8697c15331677e6ebccc']]
         ], function ($err, $logs) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_array($logs));
         });
     }
 
     /**
-     * testGetWork
+     * testSubmitWork
      * 
      * @return void
      */    
-    public function testGetWork()
+    public function testSubmitWork()
     {
         $eth = $this->eth;
 
-        $eth->getWork(function ($err, $work) {
+        $eth->submitWork(
+            '0x0000000000000001',
+            '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef',
+            '0xD1FE5700000000000000000000000000D1FE5700000000000000000000000000'
+        , function ($err, $work) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
-            $this->assertTrue(is_array($work));
+            $this->assertTrue(is_bool($work));
         });
     }
 
     /**
-     * testSubmitWork
+     * testSubmitHashrate
      * 
      * @return void
      */    
-    public function testSubmitWork()
+    public function testSubmitHashrate()
     {
         $eth = $this->eth;
 
-        $eth->submitWork(
-            '0x0000000000000001',
+        $eth->submitHashrate(
             '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef',
             '0xD1FE5700000000000000000000000000D1FE5700000000000000000000000000'
         , function ($err, $work) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_bool($work));
         });
     }
 
     /**
-     * testSubmitHashrate
+     * testGetBlockByNumberAsync
      * 
      * @return void
      */    
-    public function testSubmitHashrate()
+    public function testGetBlockByNumberAsync()
     {
         $eth = $this->eth;
+        $eth->provider = $this->asyncHttpProvider;
 
-        $eth->submitHashrate(
-            '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef',
-            '0xD1FE5700000000000000000000000000D1FE5700000000000000000000000000'
-        , function ($err, $work) {
+        // should return reactphp promise
+        $promise = $eth->getBlockByNumber('latest', false, function ($err, $block) {
             if ($err !== null) {
                 return $this->assertTrue($err !== null);
             }
-            $this->assertTrue(is_bool($work));
+            // weird behavior, see https://github.com/web3p/web3.php/issues/16
+            $this->assertTrue($block !== null);
         });
+        $this->assertTrue($promise instanceof \React\Promise\PromiseInterface);
+        \React\Async\await($promise);
     }
 
     /**
@@ -803,7 +755,7 @@ public function testUnallowedMethod()
 
         $eth->hello(function ($err, $hello) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(true);
         });
diff --git a/test/unit/EthBatchTest.php b/test/unit/EthBatchTest.php
index 976fe20e..591f50e4 100644
--- a/test/unit/EthBatchTest.php
+++ b/test/unit/EthBatchTest.php
@@ -42,10 +42,36 @@ public function testBatch()
 
         $eth->provider->execute(function ($err, $data) {
             if ($err !== null) {
-                return $this->fail('Got error!');
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue($data[0] instanceof BigNumber);
             $this->assertTrue($data[1] !== null);
         });
     }
+
+    /**
+     * testBatchAsync
+     * 
+     * @return void
+     */
+    public function testBatchAsync()
+    {
+        $eth = $this->eth;
+        $eth->provider = $this->asyncHttpProvider;
+
+        $eth->batch(true);
+        $eth->protocolVersion();
+        $eth->syncing();
+
+        // should return reactphp promise
+        $promise = $eth->provider->execute(function ($err, $data) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            $this->assertTrue($data[0] instanceof BigNumber);
+            $this->assertTrue($data[1] !== null);
+        });
+        $this->assertTrue($promise instanceof \React\Promise\PromiseInterface);
+        \React\Async\await($promise);
+    }
 }
\ No newline at end of file
diff --git a/test/unit/HttpProviderTest.php b/test/unit/HttpProviderTest.php
index f1ef4bfb..57bf0605 100644
--- a/test/unit/HttpProviderTest.php
+++ b/test/unit/HttpProviderTest.php
@@ -5,6 +5,7 @@
 use RuntimeException;
 use Test\TestCase;
 use Web3\RequestManagers\HttpRequestManager;
+use Web3\RequestManagers\HttpAsyncRequestManager;
 use Web3\Providers\HttpProvider;
 use Web3\Methods\Web3\ClientVersion;
 
@@ -57,4 +58,75 @@ public function testBatch()
         $provider->send($method, null);
         $provider->execute($callback);
     }
+
+    /**
+     * testSendAsync
+     * 
+     * @return void
+     */
+    public function testSendAsync()
+    {
+        $requestManager = new HttpAsyncRequestManager($this->testHost);
+        $provider = new HttpProvider($requestManager);
+        $method = new ClientVersion('web3_clientVersion', []);
+
+        // \React\Async\await($provider->send($method, function ($err, $version) {
+        //     if ($err !== null) {
+        //         $this->fail($err->getMessage());
+        //     }
+        //     $this->assertTrue(is_string($version));
+        // }));
+        $a = $provider->send($method, function ($err, $version) {
+            if ($err !== null) {
+                $this->fail($err->getMessage());
+            }
+            $this->assertTrue(is_string($version));
+        });
+        $b = $provider->send($method, function ($err, $version) {
+            if ($err !== null) {
+                $this->fail($err->getMessage());
+            }
+            $this->assertTrue(is_string($version));
+        });
+        $c = $provider->send($method, function ($err, $version) {
+            if ($err !== null) {
+                $this->fail($err->getMessage());
+            }
+            $this->assertTrue(is_string($version));
+        });
+        \React\Async\await(\React\Async\parallel([
+            function () use ($a) { return $a; },
+            function () use ($b) { return $b; },
+            function () use ($c) { return $c; }
+        ]));
+    }
+
+    /**
+     * testBatchAsync
+     * 
+     * @return void
+     */
+    public function testBatchAsync()
+    {
+        $requestManager = new HttpAsyncRequestManager($this->testHost);
+        $provider = new HttpProvider($requestManager);
+        $method = new ClientVersion('web3_clientVersion', []);
+        $callback = function ($err, $data) {
+            if ($err !== null) {
+                $this->fail($err->getMessage());
+            }
+            $this->assertEquals($data[0], $data[1]);
+        };
+
+        try {
+            \React\Async\await($provider->execute($callback));
+        } catch (RuntimeException $err) {
+            $this->assertTrue($err->getMessage() !== true);
+        }
+
+        $provider->batch(true);
+        $provider->send($method, null);
+        $provider->send($method, null);
+        \React\Async\await($provider->execute($callback));
+    }
 }
\ No newline at end of file
diff --git a/test/unit/NetApiTest.php b/test/unit/NetApiTest.php
index 49142352..0c96d571 100644
--- a/test/unit/NetApiTest.php
+++ b/test/unit/NetApiTest.php
@@ -79,6 +79,27 @@ public function testListening()
         });
     }
 
+    /**
+     * testPeerCountAsync
+     * 
+     * @return void
+     */    
+    public function testPeerCountAsync()
+    {
+        $net = $this->net;
+        $net->provider = $this->asyncHttpProvider;
+
+        // should return reactphp promise
+        $promise = $net->peerCount(function ($err, $count) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            $this->assertTrue($count instanceof BigNumber);
+        });
+        $this->assertTrue($promise instanceof \React\Promise\PromiseInterface);
+        \React\Async\await($promise);
+    }
+
     /**
      * testUnallowedMethod
      * 
diff --git a/test/unit/NetBatchTest.php b/test/unit/NetBatchTest.php
index 8d6d5e31..9fadb1f8 100644
--- a/test/unit/NetBatchTest.php
+++ b/test/unit/NetBatchTest.php
@@ -43,11 +43,39 @@ public function testBatch()
 
         $net->provider->execute(function ($err, $data) {
             if ($err !== null) {
-                return $this->fail('Got error!');
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_string($data[0]));
             $this->assertTrue(is_bool($data[1]));
             $this->assertTrue($data[2] instanceof BigNumber);
         });
     }
+
+    /**
+     * testBatchAsync
+     * 
+     * @return void
+     */
+    public function testBatchAsync()
+    {
+        $net = $this->net;
+        $net->provider = $this->asyncHttpProvider;
+
+        $net->batch(true);
+        $net->version();
+        $net->listening();
+        $net->peerCount();
+
+        // should return reactphp promise
+        $promise = $net->provider->execute(function ($err, $data) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            $this->assertTrue(is_string($data[0]));
+            $this->assertTrue(is_bool($data[1]));
+            $this->assertTrue($data[2] instanceof BigNumber);
+        });
+        $this->assertTrue($promise instanceof \React\Promise\PromiseInterface);
+        \React\Async\await($promise);
+    }
 }
\ No newline at end of file
diff --git a/test/unit/PersonalBatchTest.php b/test/unit/PersonalBatchTest.php
index 7af5fff7..0d630abf 100644
--- a/test/unit/PersonalBatchTest.php
+++ b/test/unit/PersonalBatchTest.php
@@ -41,7 +41,7 @@ public function testBatch()
 
         $personal->provider->execute(function ($err, $data) {
             if ($err !== null) {
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_array($data[0]));
             $this->assertTrue(is_string($data[1]));
diff --git a/test/unit/ProviderTest.php b/test/unit/ProviderTest.php
index 53ee6a0a..32af5176 100644
--- a/test/unit/ProviderTest.php
+++ b/test/unit/ProviderTest.php
@@ -20,9 +20,10 @@ public function testSetRequestManager()
 
         $this->assertEquals($provider->requestManager->host, 'http://localhost:8545');
 
-        $requestManager = new RequestManager($this->testRinkebyHost);
+        $requestManager = new RequestManager($this->testHost2);
         $provider->requestManager = $requestManager;
 
+        // there is no setter for request manager
         $this->assertEquals($provider->requestManager->host, 'http://localhost:8545');
     }
 }
\ No newline at end of file
diff --git a/test/unit/RequestManagerTest.php b/test/unit/RequestManagerTest.php
index 3498ef02..61dabdb2 100644
--- a/test/unit/RequestManagerTest.php
+++ b/test/unit/RequestManagerTest.php
@@ -18,7 +18,8 @@ public function testSetHost()
         $this->assertEquals($requestManager->host, 'http://localhost:8545');
         $this->assertEquals($requestManager->timeout, 0.1);
 
-        $requestManager->host = $this->testRinkebyHost;
+        // there is no setter for host and timeout
+        $requestManager->host = $this->testHost2;
         $requestManager->timeout = 1;
         $this->assertEquals($requestManager->host, 'http://localhost:8545');
         $this->assertEquals($requestManager->timeout, 0.1);
diff --git a/test/unit/ShhApiTest.php b/test/unit/ShhApiTest.php
index e0fcd0e1..795e8a53 100644
--- a/test/unit/ShhApiTest.php
+++ b/test/unit/ShhApiTest.php
@@ -465,6 +465,28 @@ public function testVersion()
     //         $this->assertTrue(true);
     //     });
     // }
+
+    /**
+     * testVersionAsync
+     * 
+     * @return void
+     */    
+    public function testVersionAsync()
+    {
+        $shh = $this->shh;
+        $shh->provider = $this->asyncHttpProvider;
+
+        // should return reactphp promise
+        $promise = $shh->version(function ($err, $version) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            $this->assertTrue(is_string($version));
+        });
+        $this->assertTrue($promise instanceof \React\Promise\PromiseInterface);
+        \React\Async\await($promise);
+    }
+
     /**
      * testUnallowedMethod
      * 
diff --git a/test/unit/ShhBatchTest.php b/test/unit/ShhBatchTest.php
index 01093277..b1b3fc7a 100644
--- a/test/unit/ShhBatchTest.php
+++ b/test/unit/ShhBatchTest.php
@@ -41,34 +41,38 @@ public function testBatch()
 
         $shh->provider->execute(function ($err, $data) {
             if ($err !== null) {
-                return $this->fail('Got error!');
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_string($data[0]));
             $this->assertTrue(is_string($data[1]));
+            $this->assertEquals($data[0], $data[1]);
         });
     }
 
     /**
-     * testWrongParam
+     * testBatchAsync
      * 
      * @return void
      */
-    // public function testWrongParam()
-    // {
-    //     $this->expectException(RuntimeException::class);
-
-    //     $shh = $this->shh;
+    public function testBatchAsync()
+    {
+        $shh = $this->shh;
+        $shh->provider = $this->asyncHttpProvider;
 
-    //     $shh->batch(true);
-    //     $shh->version();
-    //     $shh->hasIdentity('0');
+        $shh->batch(true);
+        $shh->version();
+        $shh->version();
 
-    //     $shh->provider->execute(function ($err, $data) {
-    //         if ($err !== null) {
-    //             return $this->fail('Got error!');
-    //         }
-    //         $this->assertTrue(is_string($data[0]));
-    //         $this->assertFalse($data[1]);
-    //     });
-    // }
+        // should return reactphp promise
+        $promise = $shh->provider->execute(function ($err, $data) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            $this->assertTrue(is_string($data[0]));
+            $this->assertTrue(is_string($data[1]));
+            $this->assertEquals($data[0], $data[1]);
+        });
+        $this->assertTrue($promise instanceof \React\Promise\PromiseInterface);
+        \React\Async\await($promise);
+    }
 }
\ No newline at end of file
diff --git a/test/unit/Web3BatchTest.php b/test/unit/Web3BatchTest.php
index 825a7248..4fbdd534 100644
--- a/test/unit/Web3BatchTest.php
+++ b/test/unit/Web3BatchTest.php
@@ -48,7 +48,7 @@ public function testBatch()
 
         $web3->provider->execute(function ($err, $data) {
             if ($err !== null) {
-                return $this->fail('Got error!');
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_string($data[0]));
             $this->assertEquals($data[1], $this->testHash);
@@ -72,7 +72,7 @@ public function testWrongParam()
 
         $web3->provider->execute(function ($err, $data) {
             if ($err !== null) {
-                return $this->fail('Got error!');
+                return $this->fail($err->getMessage());
             }
             $this->assertTrue(is_string($data[0]));
             $this->assertEquals($data[1], $this->testHash);