Find the shipments your carrier will surcharge — before the invoice arrives.

Send 90 days of USPS shipment records. Get back a line-by-line list of every package that triggers an oversize, balloon, or dimensional charge under the 2026 rules, the rule each one hits, and what to change.

Send your file →

Manual review. 48 hours. Refunded if it doesn't find a package you should change.

Why this is worth doing now

USPS changed two things in 2026 that most sellers haven't priced in:

The overweight / oversize fee went from $100 to $200 — effective July 12, 2026 (DMM 601.1.2.3). A package over 130 inches in length + girth, or over 70 lb, is non-mailable. If it's found in the network, the fee is assessed to the shipper and the parcel doesn't move until it's paid.

The dimensional divisor is now 139, not 166 — also July 12, 2026 (DMM 123). If your labels are still sized against the old divisor, boxes that used to sit under 1 cubic foot now bill by dimension instead of actual weight.

Neither is a price increase. Both are changes to which row of the table your box lands in. That's the kind that only shows up on a bill — and only on the packages that happened to cross a line.

What you get back

Column	What it tells you
Tracking #	The exact shipment — so you can reconcile it against the invoice
Billable weight	Actual vs dimensional, and which one the carrier used
Rule triggered	Balloon · 1 ft³ DIM · Oversize · Non-mailable — by name, not by guess
Margin	How many inches or pounds past the threshold — the packages that are 2 inches away are the cheap fixes
Fix	Shrink to X × Y × Z, or drop N lb — the smallest change that clears the rule

Delivered as a spreadsheet plus a one-page summary: how many packages are exposed, which rule accounts for most of it, and what the biggest fixes are worth in avoided fees.

How it works

Export. Pull a 90-day shipment report from your label platform (Shippo, Pirate Ship, ShipStation, Etsy, eBay — any CSV with tracking, weight, and box dimensions).
Send. Email the file. No account, no integration, no access to your carrier accounts.
Read. Within 48 hours you get the spreadsheet and the summary.

Price

One-time audit · 90 days of shipments

$49$79

Up to 2,000 shipments per file
48-hour turnaround
Spreadsheet + one-page summary
Rule sources and effective dates cited on every line

Pay $49 and send your file →

How it works: pay, then email the CSV to the address on the receipt. I start the same day.

If the report doesn't identify at least one package you should change, you pay nothing. Full refund, no questions, no "store credit". You don't have to argue for it — if the only thing I can tell you is "your packages are fine", that's not worth $49 and I won't keep it.

And I won't invent findings to justify the fee. If 95% of your shipments are clean, the report says 95% are clean. A padded report is worth nothing to you and costs me the only thing I have.

Why pay for this instead of using a free calculator. A calculator tells you what one box bills at. This tells you which of your last 2,000 boxes are already costing you money — and a single oversize parcel is a $200 fee. If the audit finds one, it's paid for itself four times.

Questions

Is my shipping data safe?

You send one CSV. It contains tracking numbers, weights, dimensions and ZIPs — no customer names, no addresses, no payment data. Nothing is stored after the report is delivered, and nothing is uploaded to any third-party service. If you'd rather strip the tracking numbers, that works too.

What if my file is a mess?

Send it as-is. Reconciling a messy export is part of the job — that's what you're paying for. If the columns aren't there at all (no dimensions anywhere), I'll tell you within a day and refund without starting.

Do you do UPS and FedEx?

Not yet. USPS and the two couriers don't just use different numbers — they use different triggers. USPS decides size surcharges on length + girth (84, 108 and 130 inches). UPS and FedEx moved to cubic volume in 2026 and added a 90 lb minimum billable weight once a parcel is classified oversized. The same box gets three different answers, and the gap between them runs into hundreds of dollars.

Being exact on one carrier beats being approximately right on three — a wrong line in a report is worse than a missing one. If you ship mostly UPS or FedEx, email me which one and roughly how many parcels a month. That's what decides which one gets built next.

Who is doing this?

One person, manually. That's why it's 48 hours and not instant, and why the price is $49 and not $9/month. It also means if something in your file doesn't fit the rules, I'll say so rather than force it into a column.

What if I don't ship with USPS?

Then this won't help yet, and I'd rather say that up front than take your money.

Check one box for free

If you just want to know about a single parcel, two free tools cover the most common questions:

Length + girth → which size tier
The $200 oversize fee → what triggers it