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Spot changes in your Amazon FBA fee estimates.
Short answer
Notifcentral checks fee estimates from Amazon every six hours and compares each active listing with its previous snapshot. A detected change produces a mobile alert with the old amount, new amount and difference. It monitors eight fee types without an ASIN limit. These are estimates, so check actual charges before requesting reimbursement.
How Notifcentral detects it
Data source
Amazon fee estimates
How often
Every 6 hours
Every six hours, Notifcentral saves your fee estimates and compares each ASIN with its previous values. A change to any of the eight monitored fee types sends an alert with the old and new figures.
| Fee type | Basis | What moves it |
|---|---|---|
| Referral | Percentage of sale price | Category reclassification, Amazon policy updates |
| FBA Fulfillment | Per unit | Size-tier change, remeasurement, annual rate updates |
| FBA Pick & Pack | Per unit | Size-tier change, rate updates |
| FBA Weight Handling | Per unit | Re-weighing, packaging change |
| FBA Order Handling | Per order | Fulfilment channel and rate updates |
| FBA Delivery Services | Per unit | Delivery programme and rate updates |
| Variable Closing | Per unit | Media category rules |
| Fixed Closing | Per unit | Plan type and category rules |
What this does not do
Fee estimates can differ from actual charges. An increase does not by itself establish an error or a right to reimbursement. Storage fees are not covered by this monitor.
What the alert looks like
These are the notification strings the app sends. The wording is exact; the values are examples.
NotifcentralFBA Fulfillment fee increased 1.49 USD/unit
Wireless Earbuds Pro: FBA Fulfillment went from 3.22 USD to 4.71 USD per unit
NotifcentralReferral fee increased 0.5%
Stainless Steel Bottle 750ml: Referral went from 8.0% to 8.5%
What it costs to find out late
A wrong measurement can double a fee.
Sellers on the Amazon Seller Forums keep reporting the same problem. A warehouse measures a product into a higher size tier, Amazon sends no alert or email, and the seller finds out months later. One seller on Reddit said two SKUs were charged at the wrong tier for five months before anyone noticed.
Amazon Seller Forums, Apr 2026: $40.43 -> $88.93 per order after Amazon mis-measured the productSmall per-unit increases add up.
A $1.49/unit increase at 600 units a month is $894 a month, or $10,728 a year, on one ASIN.
$1.49/unit x 600 units = $894/mo undiscovered costA dispute is easier while the change is recent.
Amazon will re-measure on request and can reimburse an overcharge. The case is far easier to argue while the change is recent and you still have the numbers.
What to do when it fires
Check the dimensions Amazon has on file
Open the ASIN in Seller Central and compare Amazon's recorded length, width, height and weight with the packed product. If the size tier went up but your packaging did not change, the measurement is probably wrong.
Request a remeasurement (Cubiscan)
If the recorded dimensions are wrong, open a case asking for the unit to be re-measured. Amazon runs the product through a Cubiscan and updates the record.
Ask for the overcharge back
Check the charged fees and dates against the corrected dimensions. The US weight-and-dimensions reimbursement policy requires a request within 90 days of each fee charge. An estimate-change date is not the charge date.
Re-check the margin at the new fee
If the new fee is correct, check whether the ASIN still makes your minimum margin at that fee, then decide whether to reprice or delist.
Questions about fba fee changes alerts
Checks run on a six-hour schedule. Amazon data availability, processing and phone delivery can add delays, so this is not a guarantee that every fee change reaches you within six hours. The alert compares estimates, not individual charged fees.
Eight: Referral, FBA Fulfillment, FBA Pick & Pack, FBA Weight Handling, FBA Order Handling, FBA Delivery Services, Variable Closing and Fixed Closing. Referral is compared as a percentage; the rest are compared as absolute per-unit amounts.
No. Every active listing on every connected marketplace is monitored, whether you have 10 ASINs or 10,000. There is no per-ASIN pricing.
Referral and closing fees apply to FBM listings and are monitored. The FBA-specific fulfilment fees only exist on FBA listings.
Other alerts Notifcentral sends
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Included in Kirana at $9.99/month. Connect your Amazon store once with read-only access, and Notifcentral monitors it from then on.
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