At the moment, as per the FAQ in the docs below, the ASIN level reports are not collected.

This makes the connector far less useful to partners, since the vast majority of the use-cases internally that get requested will relate to the product (asin) - hence making the rolled up aggregate reports lower value.

There is an hourly sales report that IS at the ASIN level - and I would propose that where ASIN is available, that is the level of granularity the reports should be collected at, since they can then be rolled up to a higher level if required at the endpoint. 

--- From the Amazon Docs ---

In the Amazon Docs it does seem possible to collect at this level as it is a report attribute - for example on the Vendor Sales Report: reportType Value: GET_VENDOR_SALES_REPORT

Select to expand list of report attributes.

• salesAggregate
• salesByAsin
• startDate
• endDate
• shippedCogs
• shippedRevenue
• shippedUnits

--- From the Fivetran docs: ---

Question

Does Fivetran retrieve Vendor Sales Reports (GET_VENDOR_SALES_REPORT) and Vendor Inventory Reports (GET_VENDOR_INVENTORY_REPORT) at the Amazon Standard Identification Number (ASIN) level?

Answer

No, we don't retrieve Vendor Sales Reports and Vendor Inventory Reports at the ASIN level. Instead, we fetch the data at a higher level using the distributorView and sellingProgram attributes. As a result, the reports provide data aggregated at a broader level than the individual ASIN level. See Amazon's Selling Partner API Analytics Reports documentation for more information.