AWS Exposes Free Tier API to Help Developers Avoid Unexpected Bills
Briefly

We hope that making the GetFreeTierUsage API publicly available can help you have fun with AWS, have better use of the AWS Free Tier offers, and be aware of what is free and what to do when you get close to or over a limit.
The response is a JSON document containing a description of the current usage for each offer that applies to the account during the billing period.
Read at InfoQ
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