A service that alerts you if incoming data is in an unexpected format. Is this a good idea?

The basic use case would be using an external api. You expect a REST api call's response to look something like this:

{
    "name": "Jones, Roy",
    "dob":  "01/16/1969"
}

Your code uses the comma in the name to format it and converts the "dob" field to something more readable such as January 16, 1969.

Now the api has sent you this:

{
    "name": "Roy Jones",
    "dob":  "16/January/1969 00:00:00" 
}

Well your app as likely just either blown up, or displayed the user junk. The service I'd like to build would detect this change and alert you via email or text.

You would just forward like 1 out of every 5 or so external api responses to my service via a REST endpoint and the service would validate the data integrity.

Would anyone pay for this?
Who would be the main target audience for this?
How could the idea be improved?