I'm using the Cost Explorer API through boto to track my monthly costs for allocation, but I've noticed that the total I get from the API is consistently a bit higher than my monthly invoice. The differences range from $4 to $35. I've carefully compared the invoice line by line looking for any discrepancies, but I haven't found anything that matches. I'm wondering if there's an issue with my logic in the code I've implemented or if there's a better method to obtain the accurate total. Can anyone share their experiences or advice? Here's the code I'm using to pull the costs:
```python
session = get_aws_session()
ce_client = session.client('ce')
# Calculate first and last day of last month
...
response = ce_client.get_cost_and_usage(
...
)
```
4 Answers
One thing to consider is whether you're looking at blended versus unblended costs. The API pulls unblended costs, which can show different totals depending on how your services share costs. Make sure to check if that difference aligns with your invoice calculations.
It might help to know whether this discrepancy happens across all services or just specific ones. Also, invoices could be finalized a few days after the end of the month. If you're querying immediately after that, you might be catching some costs that aren't finalized yet.
Check to see when you're running your queries. The costs aren't always finalized at the month's end, which could explain some of the discrepancies. // If the API's date settings are off by a day, adjusting those could also potentially match up the totals more closely.
The cost calculation in the API can slightly differ because of how it handles date ranges. If you're using a slightly different date range than what the console uses for final calculations, that could lead to the discrepancies you're seeing. Adjusting the parameters in your API call might help.
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