Getting charged for Free Tier

Question

Hi
I have 0 users. I am working on this with one other guy. I have a bill for $55 in the 1st 2 weeks of our using AWS "Free". Frankly, I don't believe it.

My app doesn't do anything without user interaction. Then it just serves data. Being about 99% of the user base, I'm quite sure I didn't use a couple hundred hours of DB or CPU time.

I'd like a full explanation please.

EU (Stockholm) USD 40.95
Amazon Aurora Storage and I/O USD 0.28
USD 0.11 per GB-month of consumed storage for Aurora PostgreSQL 0.006 GB-Mo USD 0.00
USD 0.21 per 1 million I/O requests for Aurora PostgreSQL 1,314,032 IOs USD 0.28

Amazon Relational Database Service for Aurora PostgreSQL USD 40.67
$ 0.148 per RDS db.t4g.large Single-AZ instance hour (or partial hour) running Aurora
PostgreSQL
114.894 Hrs USD 17.00
USD 0.02 per GB-month of backup storage exceeding free allocation for Aurora PostgreSQL 0.004 GB-Mo USD 0.00
USD 0.103 per hour per vCPU running RDS Extended Support for Aurora PostgreSQL 11 in Year
1, Year 2
229.787 vCPU-hour USD 23.67

Answer

Hello.

Looking at the bill you shared, it appears that you are using RDS Aurora, but RDS Aurora is not included in the free tier.  
The only DB engines that can be used with the RDS free tier are MySQL, MariaDB, PostgreSQL, and SQL Server (SQL Server Express Edition).  
https://aws.amazon.com/rds/free/?nc1=h_ls  
> * 750 hours of Amazon RDS Single-AZ db.t2.micro, db.t3.micro, and db.t4g.micro Instances usage running MySQL, MariaDB, PostgreSQL databases each month. If running more than one instance, usage is aggregated across instance classes.  
> * 750 hours of Amazon RDS Single-AZ db.t2.micro Instance usage running SQL Server (running SQL Server Express Edition) each month.
> * 20 GB of General Purpose SSD (gp2) storage per month.
> * Free backup storage up to 100% of the total provisioned storage size of your active DB instances for a region.*

Answer

It looks like majority charge is from instance hour of db.t4g.large which is not included in the [RDS free tier](https://aws.amazon.com/rds/free/).

AWS Free Tier with Amazon RDS
* 750 hours of Amazon RDS Single-AZ db.t2.micro, db.t3.micro, and db.t4g.micro Instances usage running MySQL, MariaDB, PostgreSQL databases each month. If running more than one instance, usage is aggregated across instance classes.
* 750 hours of Amazon RDS Single-AZ db.t2.micro Instance usage running SQL Server (running SQL Server Express Edition) each month.
* 20 GB of General Purpose SSD (gp2) storage per month.
* Free backup storage up to 100% of the total provisioned storage size of your active DB instances for a region.*
* * At any time, if your total backup storage exceeds the total active instance provisioned storage, then you will be charged the standard RDS rates for the incremental storage. Based upon our experience, the vast majority of databases require less raw storage for a backup than for the primary dataset meaning most customers will never have to pay for backup storage..

Getting charged for Free Tier

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