1. What is FedEx One Rate®?
FedEx One Rate is flat-rate pricing for FedEx Express shipments when you use FedEx-supplied packaging (envelopes, paks, tubes, boxes, etc.).
Cost depends on package type + delivery speed, not on weight (as long as ≤ 50 lbs) or distance (zones 2–8).
Available only for FedEx Express (2Day, Express Saver, Standard Overnight, etc.) — not Ground.
2. Magento 2 Native Behavior
Magento 2 core has Flat Rate (one global cost, per order/item/weight).
FedEx integration in Magento 2 does not include One Rate out of the box. It only pulls live rates via the FedEx Web Services (SOAP or REST).
So, if you want “FedEx One Rate” as a selectable shipping option, you have 2 paths:
3. Implementation Options
Option A: Custom Flat-Rate Methods
Create a custom shipping method(s) in Magento like:
FedEx One Rate – Envelope (2Day) → $9.50
FedEx One Rate – Medium Box (Express Saver) → $14.25
FedEx One Rate – Large Box (Standard Overnight) → $39.10
You hardcode the rates (from FedEx’s One Rate chart) into
etc/config.xmlorsystem.xmlso the admin can manage them.Downside: no live API validation — you must keep rates updated manually.
Option B: FedEx Web Services (with One Rate flag)
FedEx SOAP/REST APIs do support One Rate pricing if you:
Use
RequestedPackageLineItems->SpecialServicesRequested->ContainerType=FEDEX_ONE_RATE(or valid FedEx packaging type likeFEDEX_SMALL_BOX,FEDEX_MEDIUM_BOX).Request rates with
RateRequest->RateRequestTypesset toACCOUNTandLIST.
FedEx will then return One Rate if you specified eligible packaging.
👉 In Magento 2, you’d extend the FedEx carrier model (Magento\Fedex\Model\Carrier) to pass in these fields and parse One Rate from the response.
Option C: Marketplace Extensions
Some shipping extensions (ShipperHQ, PluginHive, EcomDev) already expose FedEx One Rate as separate selectable options in Magento.
Good if you don’t want to maintain FedEx API customizations yourself.
4. Recommended Setup
If you only need basic flat-rate “like FedEx One Rate”, use Option A (custom flat rate methods) — fastest, simplest.
If you need real FedEx One Rate pricing directly from FedEx, go Option B — requires API integration but ensures accuracy and packaging validation.