diff --git a/src/Eth.php b/src/Eth.php
index 15a4237..57c14a2 100644
--- a/src/Eth.php
+++ b/src/Eth.php
@@ -155,6 +155,13 @@ class Eth
                 ]
             ]
         ],
+        'eth_estimateGas' => [
+            'params' => [
+                [
+                    'validators' => TransactionValidator::class
+                ]
+            ]
+        ]
     ];
 
     /**
diff --git a/test/unit/EthTest.php b/test/unit/EthTest.php
index f0053ff..0509e0d 100644
--- a/test/unit/EthTest.php
+++ b/test/unit/EthTest.php
@@ -483,8 +483,7 @@ class EthTest extends TestCase
             'data' => "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
         ], function ($err, $transaction) {
             if ($err !== null) {
-                // infura banned us to send transaction
-                return $this->assertTrue($err->getCode() === 405);
+                return $this->fail($err->getMessage());
             }
             if (isset($transaction->result)) {
                 $this->assertTrue(is_string($transaction->result));
@@ -499,6 +498,39 @@ class EthTest extends TestCase
         });
     }
 
+    /**
+     * testEstimateGas
+     * 
+     * @return void
+     */    
+    public function testEstimateGas()
+    {
+        $eth = $this->web3->eth;
+
+        $eth->estimateGas([
+            'from' => "0xb60e8dd61c5d32be8058bb8eb970870f07233155",
+            'to' => "0xd46e8dd67c5d32be8058bb8eb970870f07244567",
+            'gas' => "0x76c0",
+            'gasPrice' => "0x9184e72a000",
+            'value' => "0x9184e72a",
+            'data' => "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
+        ], function ($err, $gas) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            if (isset($gas->result)) {
+                $this->assertTrue(is_string($gas->result));
+            } else {
+                if (isset($gas->error)) {
+                    // it's just test hex.
+                    $this->assertTrue(is_string($gas->error->message));
+                } else {
+                    $this->assertTrue(true);
+                }
+            }
+        });
+    }
+
     /**
      * testUnallowedMethod
      *