diff --git a/src/TransactionBuilder.php b/src/TransactionBuilder.php
index f940de5..2f70006 100644
--- a/src/TransactionBuilder.php
+++ b/src/TransactionBuilder.php
@@ -36,7 +36,7 @@ public function __construct(Tron $tron)
      * @return array
      * @throws TronException
      */
-    public function sendTrx($to, $amount, string $from = null)
+    public function sendTrx($to, $amount, string $from = null, string $message = null)
     {
         if ($amount < 0) {
             throw new TronException('Invalid amount provided');
@@ -53,11 +53,17 @@ public function sendTrx($to, $amount, string $from = null)
             throw new TronException('Cannot transfer TRX to the same account');
         }
 
-        $response = $this->tron->getManager()->request('wallet/createtransaction', [
+        $params = [
             'to_address' => $to,
             'owner_address' => $from,
             'amount' => $this->tron->toTron($amount),
-        ]);
+        ];
+
+        if(!is_null($message)) {
+            $params['extra_data'] = $this->tron->stringUtf8toHex($message);
+        }
+
+        $response = $this->tron->getManager()->request('wallet/createtransaction', $params);
 
         return $response;
     }
diff --git a/src/Tron.php b/src/Tron.php
index 9d51343..7a2ac9d 100644
--- a/src/Tron.php
+++ b/src/Tron.php
@@ -675,20 +675,20 @@ public function getTransactionCount(): int
      * Send transaction to Blockchain
      *
      * @param string $to
-     * @param float $amount
+     * @param string $amount
      * @param string|null $message
      * @param string $from
      *
      * @return array
      * @throws TronException
      */
-    public function sendTransaction(string $to, float $amount, string $message= null, string $from = null): array
+    public function sendTransaction(string $to, string $amount, string $message= null, string $from = null): array
     {
         if (is_null($from)) {
             $from = $this->address['hex'];
         }
 
-        $transaction = $this->transactionBuilder->sendTrx($to, $amount, $from);
+        $transaction = $this->transactionBuilder->sendTrx($to, $amount, $from, $message);
         $signedTransaction = $this->signTransaction($transaction, $message);
 
 
diff --git a/src/TronInterface.php b/src/TronInterface.php
index 32220e1..a1f0325 100644
--- a/src/TronInterface.php
+++ b/src/TronInterface.php
@@ -60,7 +60,7 @@ public function getTransactionCount();
      * @return array
      * @throws TronException
      */
-    public function sendTransaction(string $to, float $amount, string $from = null);
+    public function sendTransaction(string $to, string $amount, string $from = null);
 
     /**
      * Modify account name