Ad Account Reachestimate

GET /v20.0/act_<AD_ACCOUNT_ID>/reachestimate?targeting_spec=%7B%22geo_locations%22%3A%7B%22countries%22%3A%5B%22US%22%5D%7D%2C%22age_min%22%3A20%2C%22age_max%22%3A40%7D HTTP/1.1
Host: graph.facebook.com

/* PHP SDK v5.0.0 */
/* make the API call */
try {
  // Returns a `Facebook\FacebookResponse` object
  $response = $fb->get(
    '/act_<AD_ACCOUNT_ID>/reachestimate?targeting_spec=%7B%22geo_locations%22%3A%7B%22countries%22%3A%5B%22US%22%5D%7D%2C%22age_min%22%3A20%2C%22age_max%22%3A40%7D',
    '{access-token}'
  );
} catch(Facebook\Exceptions\FacebookResponseException $e) {
  echo 'Graph returned an error: ' . $e->getMessage();
  exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
  exit;
}
$graphNode = $response->getGraphNode();
/* handle the result */

/* make the API call */
FB.api(
    "/act_<AD_ACCOUNT_ID>/reachestimate",
    {
        "targeting_spec": "{\"geo_locations\":{\"countries\":[\"US\"]},\"age_min\":20,\"age_max\":40}"
    },
    function (response) {
      if (response && !response.error) {
        /* handle the result */
      }
    }
);

Bundle params = new Bundle();
params.putString("targeting_spec", "{\"geo_locations\":{\"countries\":[\"US\"]},\"age_min\":20,\"age_max\":40}");
/* make the API call */
new GraphRequest(
    AccessToken.getCurrentAccessToken(),
    "/act_<AD_ACCOUNT_ID>/reachestimate",
    params,
    HttpMethod.GET,
    new GraphRequest.Callback() {
        public void onCompleted(GraphResponse response) {
            /* handle the result */
        }
    }
).executeAsync();

NSDictionary *params = @{
  @"targeting_spec": @"{\"geo_locations\":{\"countries\":[\"US\"]},\"age_min\":20,\"age_max\":40}",
};
/* make the API call */
FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc]
                               initWithGraphPath:@"/act_<AD_ACCOUNT_ID>/reachestimate"
                                      parameters:params
                                      HTTPMethod:@"GET"];
[request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection,
                                      id result,
                                      NSError *error) {
    // Handle the result
}];

curl -X GET -G \
  -d 'targeting_spec={
       "geo_locations": {
         "countries": [
           "US"
         ]
       },
       "age_min": 20,
       "age_max": 40
     }' \
  -d 'access_token=<ACCESS_TOKEN>' \
  https://graph.facebook.com/v20.0/act_<AD_ACCOUNT_ID>/reachestimate