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Cost Anomaly alerts do exactly this.

You can't even setup Cloudwatch alerts on your actual spend, the only metric available to you is "EstimatedCharges".

Which is great if you understand them and set them up. The post here is an experience following an Amazon tutorial and without expecting it, ending up $$$ in debt.

Again, Amazon isn't stepping up to protect users from themselves. They could do a lot more.

They refunded him the money, without a lot of hassle. He toddled into a rough edge, bumped his head, Amazon made it better and apparently gave him a lollipop as well and sent him on his way. I think Amazon should get some credit here.

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