diff --git a/src/Eth.php b/src/Eth.php
index 621787e..29bcfad 100644
--- a/src/Eth.php
+++ b/src/Eth.php
@@ -10,6 +10,7 @@ use Web3\Validators\AddressValidator;
 use Web3\Validators\TagValidator;
 use Web3\Validators\QuantityValidator;
 use Web3\Validators\BlockHashValidator;
+use Web3\Validators\HexValidator;
 
 class Eth
 {
@@ -118,6 +119,15 @@ class Eth
                 ],
             ]
         ],
+        'eth_sign' => [
+            'params'=> [
+                [
+                    'validators' => AddressValidator::class,
+                ], [
+                    'validators' => HexValidator::class
+                ],
+            ]
+        ],
     ];
 
     /**
diff --git a/test/unit/EthTest.php b/test/unit/EthTest.php
index a100ef7..04d69b0 100644
--- a/test/unit/EthTest.php
+++ b/test/unit/EthTest.php
@@ -383,6 +383,28 @@ class EthTest extends TestCase
         });
     }
 
+    /**
+     * testSign
+     * 
+     * @return void
+     */    
+    public function testSign()
+    {
+        $eth = $this->web3->eth;
+
+        $eth->sign('0x407d73d8a49eeb85d32cf465507dd71d507100c1', '0xdeadbeaf', function ($err, $sign) {
+            if ($err !== null) {
+                // infura banned us to sign message
+                return $this->assertTrue($err->getCode() === 405);
+            }
+            if (isset($sign->result)) {
+                $this->assertTrue(is_string($sign->result));
+            } else {
+                $this->fail($sign->error->message);
+            }
+        });
+    }
+
     /**
      * testUnallowedMethod
      *