텍스트를 음성변환 해주는 API 있을까요?

전 네이버거 사용중입니다

<?php
$client_id = "YOUR_CLIENT_ID";
$client_secret = "YOUR_CLIENT_SECRET";
$encText = urlencode("반갑습니다.");
$postvars = "speaker=mijin&speed=0&text=".$encText;
$url = "https://openapi.naver.com/v1/voice/tts.bin";
$is_post = true;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, $is_post);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch,CURLOPT_POSTFIELDS, $postvars);
$headers = array();
$headers[] = "X-Naver-Client-Id: ".$client_id;
$headers[] = "X-Naver-Client-Secret: ".$client_secret;
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$response = curl_exec ($ch);
$status_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
echo "status_code:".$status_code."<br>";
curl_close ($ch);
if($status_code == 200) {
//echo $response;
$fp = fopen("tts.mp3", "w+");
fwrite($fp, $response);
fclose($fp);
echo "<a href='tts.mp3'>TTS재생</a>";
} else {
echo "Error 내용:".$response;
}
?>

@헌이 네이버 계정부터 만든후 확인해 보겠습니다.정보 감사합니다.