addEmailsToRecipientList('1234567', 'moron@gmail.com, 'dude');

function addEmailsToRecipientList($list, $emails, $name){
        $username= 'gmac';
        $password= '1234567';

        $data = array("name" => "$name", "email" => "$email");
        $data_string = json_encode($data);

        $ch = curl_init("https://api.sendgrid.com/v3/contactdb/lists/$list/recipients?api_user='.$username.'&api_key='. $password");
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array(
                'Content-Type: application/json',
                'Content-Length: ' . strlen($data_string))
        );
        $result = curl_exec($ch);
        curl_close($ch);
}