UniUni Guide
UniUni is a last-mile delivery carrier serving ecommerce businesses across the United States and Canada. With a focus on speed, reliability, and adaptability, UniUni helps businesses streamline the final leg of the shipping process while supporting scalable, tech-driven logistics solutions.
This guide provides detailed information on utilizing UniUni shipping with the EasyPost API, covering account setup, rates, label creation, manifests, tracking, and more.
Sign up for an EasyPost account to obtain a Test and Production API key. See Authentication and Key Management for more information.
Note: Negotiated rates are only available in Production mode.
- Contact UniUni to request a shipper account. A representative will be in touch for additional details regarding the account.
- Inform UniUni about using EasyPost’s API for label purchases.
- Acquire rates and align any additional shipping needs.
- Obtain the following account credentials:
client_id
client_secret
customer_number
pickup_warehouse
: Accepted values: “ATL”, “DEN”, “DFW”, “EWR”, “JFK”, “LAX”, “MIA”, “ORD”, “SEA”, “SJC”, “SLC”, “YEG”, “YOW”, “YQB”, “YQR”, “YUL”, “YVR”, “YWG”, “YXE”, “YYC”, “YYZ”
- Input carrier-specific credentials within the EasyPost Carrier Account Dashboard for comprehensive rate access.
Download an EasyPost Client Library or utilize the REST API with cURL.
Examine the EasyPost Objects section to understand the API's structure, which is critical for constructing requests and interpreting responses.
UniUni is a Live Rating integration, enabling real-time rate retrieval for shipments created via EasyPost.
- When creating a shipment, EasyPost requests UniUni for shipment rates specific to the user’s UniUni account.
- The rates provided are directly from UniUni and tailored to the user's specific account details.
- In cases of discrepancies or incorrect rates, users are advised to contact their UniUni account representative.
UniUni offers the following service levels:
Service | Transit Time | Max Dimensions (inches) | Max Weight (ounces) |
---|---|---|---|
standard | Standard service level |
UniUni has 100+ warehouses and sorting centers across North America.

There are no predefined packages for UniUni.
With EasyPost, generating shipping labels for UniUni is the same process as generating them for any other carrier.
Review the Getting Started Guide for help generating a shipping label.
One-call buys enable streamlined label purchasing through the EasyPost API by consolidating multiple operations into a single API request. This feature is designed to simplify and accelerate the shipping process by combining the creation of a shipment, retrieval of rates, and purchasing the shipping label into one efficient step.
See Reducing API Response Times for more information.
- Max length: 20 inches
- Max width: 20 inches
- Max height: 20 inches
- Max perimeter (sum of 3 sides): Less than 50 inches.
Manifesting is not supported or required for UniUni.
UniUni supports several shipment options via the EasyPost API.
For complete details see: UniUni Carrier Support and FAQs.
Voiding UniUni labels through EasyPost is supported.
EasyPost offers UniUni labels in PNG, PDF, and ZPL formats.
Possible values for UniUni shipping label sizes:
- 4 x 6
- 8.5 x 11
- 4 x 4
This guide does not specify handling hazardous materials with UniUni. Shippers are advised to contact UniUni directly for hazmat inquiries.
UniUni accommodates pickups based on individual agreements with customers. While regular pickups can be arranged directly with UniUni during the account registration process, they cannot be scheduled via the EasyPost API.
EasyPost simplifies package tracking by offering two methods:
- Tracking with an existing number and carrier.
- Using a Tracker included with an EasyPost-purchased shipping label.
The service integrates webhooks for timely shipment updates. For detailed information on tracking methods, visit the Tracking Guide.
The Carrier Metadata endpoint can programmatically return information about service levels, predefined packages, supported features, and shipment options.
Use this information to quickly integrate and make educated decisions about the mix of carriers for shipping needs. Additionally, the Carrier Metadata endpoint is available to retrieve comprehensive information about all carriers on the EasyPost platform, enhancing decision-making for carrier services.
In addition to the guidance provided in our Carrier Guides, EasyPost offers support to assist with FAQs, troubleshooting issues, and inquiries related to the EasyPost platform.
Please visit the Help Center for more information.
For questions about getting started with the EasyPost API please talk to a Shipping Expert or contact our Support team.