If you’ve been following the shipping space, you’ve probably heard about FedEx’s transition from its legacy SOAP API to a new RESTful API, with customers asked to transition by June 2026. The good news is that integrations with PH Ship Rate and Track With FedEx now fully support the REST API, giving your Shopify store access to better performance and more shipping options.
One of the biggest improvements? Full support for One Rate, which makes shipping simpler and more predictable for your customers.
In This Article:
- What Is FedEx One Rate in Shopify
- FedEx One Rate Services Available in Shopify
- FedEx One Rate vs Standard FedEx Services in Shopify
- Best Products for FedEx One Rate in Shopify
- Using FedEx One Rate with the New FedEx REST API in Shopify
- Conclusion
- FAQ’s
What Is FedEx One Rate in Shopify
One Rate eliminates the need to weigh or measure shipments if they’re under 50 lbs. You just pick the right box size, fill it up, and you’re good to go.
Here’s what makes it attractive to merchants:
- No guesswork: You’re not worried about exact weights or dimensions
- Flat pricing: Your costs are predictable
- Fits your products: Available with multiple boxes and packaging options
- Fast shipping: Works with six express service levels
The catch? One Rate only works with FedEx’s proprietary packaging; your own boxes aren’t an option. But honestly, if it saves you time and headaches, that’s usually a fair trade-off.
FedEx One Rate Services Available in Shopify
It works with selected FedEx Express services, allowing Shopify merchants to offer flat-rate expedited shipping when approved FedEx packaging is used.
Eligible services include:
- FedEx First Overnight
- FedEx Priority Overnight
- FedEx Standard Overnight
- FedEx 2Day A.M.
- FedEx 2Day
- FedEx Express Saver
This gives Shopify merchants the flexibility to offer next-day, 2-day, or 3-day delivery based on customer urgency while keeping shipping costs more predictable. FedEx applies flat pricing only when one of these services is combined with approved FedEx packaging.
FedEx One Rate vs Standard FedEx Services in Shopify
Before choosing between One Rate and standard FedEx pricing in Shopify, it helps to understand how each option affects shipping cost and packaging flexibility. The right choice depends on your product size, packaging method, and delivery strategy.
| Factor | FedEx One Rate | Standard FedEx |
|---|---|---|
| Pricing basis | Flat rate | Weight and dimensions |
| Packaging | FedEx packaging only | Any packaging |
| Surcharges | Included | Additional surcharges may apply |
| Best for | Heavy compact shipments | Mixed shipment sizes |
For Shopify merchants, it works best when products fit within approved FedEx packaging, and you want predictable shipping costs at checkout. Standard FedEx services are better for custom packaging or shipments where the package size and weight vary.
Best Products for FedEx One Rate in Shopify
One Rate is most effective for products that are dense, compact, high-value, or time-sensitive, because flat-rate pricing can reduce shipping cost compared to weight-based express rates. It works especially well when items fit neatly into approved FedEx packaging without wasting space.
Good examples include:
- Phone accessories
- Chargers
- Supplements
- Cosmetics
- Small electronics
- Repair kits
For lightweight but bulky products, standard FedEx Ground may still be more economical since One Rate is designed to benefit heavier compact shipments.
Using FedEx One Rate with the New FedEx REST API in Shopify
To use it in Shopify with the new FedEx REST API, start by connecting your FedEx account in PH Ship, Rate and Track for FedEx. Once the account is verified and setup is complete, eligible FedEx services can be displayed automatically at checkout when the shipment uses approved FedEx packaging.
- Install the app in your Shopify store and complete the initial setup wizard so the basic shipping configuration is ready before connecting your FedEx account.
- Add your FedEx account details in the FedEx REST API connection section of the app. If you need help during this step, you can follow the detailed setup guide provided with the app for account connection and shipping configuration.
- Choose your preferred validation method for account verification, such as email or mobile number, then enter the OTP received through that selected channel to complete authentication securely.
- After successful verification, your FedEx account becomes active inside the app and is ready to process shipments using FedEx REST API services. Services will become available in Shopify checkout whenever the shipment uses eligible FedEx packaging and supported FedEx Express service levels.
Conclusion
One Rate is a practical option for Shopify merchants who want shipping costs to stay predictable without spending time calculating package weight for every order. When your products fit FedEx’s approved packaging, it can simplify checkout pricing and make express shipping easier to manage for both you and your customers.
With the new REST API now fully supported through PH Ship, Rate, and Track for FedEx, setting up One Rate in Shopify is much more straightforward. Once your account is connected and verified, eligible One Rate services can appear automatically at checkout, helping you offer faster delivery options with more predictable shipping charges. For merchants shipping compact, high-value products, this can be an easy way to improve both fulfillment efficiency and customer confidence.
FAQ’s
Q. Why is FedEx One Rate so much cheaper?
It’s cheaper because it uses flat-rate pricing instead of charging by weight or dimensions. If your product fits in approved FedEx packaging, the shipping cost stays fixed even for heavier compact items. This makes it especially cost-effective for dense products that would normally cost more under standard FedEx pricing.
Q. How do you get a FedEx One Rate box?
You can order complimentary packaging directly from FedEx through their website. After receiving the packaging, create your shipping label, pack the shipment in an approved envelope, pak, box, or tube, and then drop it off or schedule a pickup.
Q. What is FedEx Shipping API?
The Shipping API allows Shopify stores and other ecommerce systems to connect directly with FedEx for real-time shipping tasks such as rate calculation, label generation, tracking, and pickup requests. It helps automate shipping by pulling FedEx services and pricing directly into your checkout and order fulfillment workflow.
Q. Who qualifies for FedEx One Rate?
To qualify for FedEx One Rate pricing, shipments must use approved FedEx packaging and stay within the weight limits: FedEx envelopes up to 10 lbs, and FedEx paks, boxes, or tubes up to 50 lbs. The shipment must also use an eligible FedEx Express service for One Rate pricing to apply.
