If you already operate a US warehouse and need additional shipping-label options, start with the warehouse location and the parcels you handle most often. We use that profile to rule out poor fits and identify channels worth testing.
What you get first
- A channel shortlist based on warehouse location and parcel profile.
- Key handoff, billing and common surcharge rules to verify during testing.
- A recommendation to start with single labels, spreadsheet batches or an API review.
Carrier scope
- FedEx
- UPS
- USPS
- UniUni
- GOFO
Carrier names describe the range we can evaluate. They do not imply a direct, official or exclusive relationship.
Why a headline rate is not enough
Carrier billing depends on more than the weight shown on a scale. FedEx explains that the billable weight can be the greater of actual weight and dimensional weight. UPS advises shippers to enter accurate weight, dimensions and residential classification to reduce later charge corrections. USPS Ground Advantage pricing and eligibility also depend on weight, size, shape and destination zone, with additional fees possible for nonstandard parcels.
That is why one quoted number cannot represent every carton leaving a warehouse. A useful comparison starts with real parcel groups and checks the rules that can change the final bill.
Build a parcel profile before comparing channels
You do not need to send every order. Start with a compact operating profile:
- Warehouse state and city, plus the main destination regions.
- The most common parcel types, actual weights and packed dimensions.
- Any lightweight but bulky, irregular, heavy or non-corrugated packages.
- Approximate residential and commercial delivery mix, if known.
- Typical daily volume, seasonal peaks and current carrier handoff method.
- Current label workflow: single labels, spreadsheet import, WMS, ERP or API.
Keep the original units clear. If warehouse staff measure in inches and pounds, do not convert the same record again in another system. Consistent measurements make test results and later billing easier to compare.
What to verify in a representative test
- The service accepts the parcel profile and returns the expected label format.
- Warehouse staff can hand parcels to the carrier using the agreed process.
- Tracking begins as expected and exceptions can be traced to the internal order number.
- Billed weight, address type and any adjustments can be reconciled with warehouse records.
- Duplicate requests, voids, failed labels, claims and returns have named owners.
A small test should include the parcel types that matter operationally, not only the easiest carton. Review the first tracking and billing results before moving a larger share of volume.
Spreadsheet first or API first?
Use spreadsheet batches when the parcel fields and routing rules are still being refined. Evaluate an API when order identifiers, units, retry behavior, duplicate-label protection and exception ownership are already clear. See the warehouse workflow and API preparation guide for the next steps.
How a small-batch test starts
- Share country, state and city for the warehouse.
- Share the primary parcel types and any available weight or dimension bands.
- Explain current label creation and carrier handoff.
- Test a small set of representative parcels.
- Review labels, tracking, billing rules and exception handling before scaling.
Pricing and after-sales handling depend on the confirmed service and current carrier rules. A representative test is more useful than applying one headline rate to every parcel size.
Official references
- FedEx: What is dimensional weight?
- UPS: How to avoid shipping charge corrections
- USPS: Ground Advantage weight, size and shape requirements
Ready to narrow the options? Share the approximate warehouse location and primary parcel types. Do not include recipient data or production credentials in the first inquiry.