I was annoyed that Mint Mobile doesn't give me logs on my data usage history so I hacked together a script that logs in and fetches my usage data from their site. It's just two API calls that return JSON so it was super easy. The login call returns a token, and there's another call that returns the used and remaining data in megabytes. I don't know why I didn't set this up years ago!
@kevinmarks haha yeah, it is always surprised by my paycheck. Then again, so am I! I guess I'm ok with a few extra alerts in that case though, better to know the system is working than to miss a real alert later.