This service offers a simple URL canary that you can check if any websites or message apps are taking a peek at the urls you send. This service requires no javascript.
Clicking the link below will create a URL that you send / paste into somewhere to check, and a monitor URL that will tell you what accesses the url. Make sure to bookmark or save the monitor URL as you will never get it again, there is no registration. URLs will expire after 30 days!
Create a new URL Snitch here