Hi,

I never did this so maybe somebody will have a better answer.

But i know you can check the origin of the request in the headers.

$request->header('origin');

Then check if secret key match domain.

Origin returns me a null. API key unique but user can use that key in many sites, so I want disable it option.

My bad it's not origin, try with

$request->header('Host');

You can check headers in chrome inspector, look at a javascript request for example ;)

It returns me a API url. Maybe it helps, I call curl on this way:

$query['appkey'] = 'some lenght key';
$str = '';
foreach($query as $k => $v)
     $str .= $k.'='.$v.'&';
$ch = curl_init();
$url = "http://apiwebsite/api/data?" . $str;
curl_setopt($ch, CURLOPT_URL, $url);
curl_exec($ch);
curl_close($ch);

Hmmm,

did you tried with

$request->header('referer');