由于机器人的缘故，Youtube Data api达到了极限

Question

My youtube api key reaching the limit fast in few hours because alot of bots search and its flooding my requests to the api, There is a way to avoid the bots but let them index the pages in search engines

MY CODE :

    function search ($keyword, $apikey, $maxResults) {      
    $googleApiUrl = 'https://www.googleapis.com/youtube/v3/search?part=snippet&q=' . urlencode($keyword) . '&maxResults=' . $maxResults . '&key=' . $apikey;

    $ch = curl_init();

    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_URL, $googleApiUrl);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_VERBOSE, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    $response = curl_exec($ch);

    curl_close($ch);
    $data = json_decode($response);
    $value = json_decode(json_encode($data), true);
    return $value;
}

Any suggestions ? Thanks in advance