enter an http or https url. by default, the service sends a post request every minute. you can choose another http method, an interval of at least one minute and a grace period of zero minutes or more. the default grace period is five minutes. a response between 200 and 299 counts as success. you receive an alert when failures continue past the grace period, then another when the url responds successfully again. choose one or more delivery destinations when subscribing. enabled channels are account messages, push notifications, email, slack, github, x, mastodon, reddit and webhooks. available choices depend on the required connections and setup. delivery channels currently add no extra charge.