[sah2ed]

Charged at a flat rate like the cost of a Digital Ocean $5/mo instance, would developers pay for such a service to provide automated notifications of service overages for all the major cloud providers?

All a developer needs to do immediately after adding a credit card to AWS/Azure/GCP would be to create an IAM role with permission to automatically add and track fine-grained billing alarms and notify via email/sms for any potential billing overages.

I think a $60/yr service like this would be useful to protect against future events of bill shock.

[autotune]

Looks like it's already been done, at least for AWS, based on a few Google results (not that I've used/tested any of these):

https://github.com/Teevity/ice https://billgist.com/ http://cloudcheckr.com/

[21]

Azure has a feature on their trial account that when you hit your free limit, you can either:

a) go into credit (so they will charge you at end of month)

b) disable services

Maybe AWS/Google also support a hard limit on spending.

[coldcode]

I looked at Lambda (we use AWS a lot at work) and decided to simply stay with a flat rate DO server. I know what it costs, no need to worry.