USPS × Fulfil

Shipping carrier

USPS

United States Postal Service offering cost-effective domestic and international mail and package delivery

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Overview

DTC brands rely on USPS for cost-effective residential delivery, especially for lightweight packages and zones where USPS offers competitive rates. Fulfil's USPS integration enables merchants to access Priority Mail, Ground Advantage, and First-Class services with automated rate comparison, making it easy to choose the most economical option for every shipment.

Type: Direct Carrier Integration

Capabilities

  • Rate shopping
  • Real-time tracking
  • Signature confirmation
  • Insurance
  • Return labels
  • International shipping
  • PO Box delivery

Supported Services

Fulfil supports the following USPS services:

  • Usps Priority
  • Usps Priority Express
  • Usps First Class
  • Usps Parcel Select
  • Usps Media Mail
  • Usps Priority Mail International
  • Usps Priority Mail Express International

Best For

  • DTC: Direct-to-consumer shipments with residential delivery
  • Wholesale: Business-to-business wholesale orders

Geographic Coverage

USPS supports shipping to:

  • US
  • International

Setup Instructions

  1. Obtain your USPS account credentials
  2. In Fulfil, navigate to Configuration → Carriers
  3. Click 'Add Carrier' and select 'USPS'
  4. Enter your API credentials
  5. Configure your shipping preferences and service levels
  6. Test the integration with a sample shipment

Features in Fulfil

Rate Shopping

Get real-time shipping rates from USPS to compare costs across different service levels.

Label Generation

Automatically generate shipping labels in your preferred format (PDF, PNG, or ZPL for thermal printers).

Tracking

Real-time tracking updates are automatically synced to your orders, keeping customers informed.

Returns

Generate return labels and process RMAs seamlessly.

Support

For questions about this integration, contact Fulfil support. For carrier-specific questions, visit USPS.

FAQ

Questions? Answers.

How do I set up USPS shipping in Fulfil?
To set up USPS in Fulfil, navigate to Configuration → Carriers, click 'Add Carrier', and select USPS. You'll need your USPS account credentials and API access. The setup typically takes 30 minutes.
Can I use USPS for both Shopify and Amazon orders?
Yes, Fulfil's ERP automatically imports orders from Shopify, Amazon, and other channels. You can ship all these orders using USPS, compare rates with other carriers, and sync tracking information back to each sales channel automatically.
Does USPS integration support rate shopping?
Yes, Fulfil's USPS integration provides rate shopping. When you're ready to ship an order, the system queries USPS for available service levels and displays rates side-by-side, allowing you to select the most cost-effective option.
Can I print USPS shipping labels from my WMS?
Yes. Fulfil's WMS generates USPS shipping labels automatically during the packing workflow. Labels can be printed in PDF, PNG, or ZPL format for thermal printers. The system also supports batch label printing for high-volume operations.
Does tracking information sync automatically?
Yes, once a USPS label is generated, tracking numbers are automatically synced to your orders in Fulfil. For Shopify and Amazon orders, tracking information is pushed back to the sales channel, triggering automated customer notification emails.
Can I use my own USPS account and negotiated rates?
Yes, Fulfil integrates with your existing USPS account, so you continue to benefit from any negotiated rates or discounts you've secured. You simply provide your USPS API credentials during setup.
Can I pre-generate USPS labels to speed up fulfillment?
Yes, Fulfil can automatically generate USPS labels when orders start picking or get packed. This is done through automation rules that trigger label generation in the background, so labels are ready by the time the shipment reaches the packing station. This significantly speeds up your fulfillment workflow.
How does rate shopping work with USPS?
Fulfil's rate shopping compares USPS rates against other carriers by considering shipping addresses, package weights and dimensions, special services, and base rates (including surcharges and discounts). This ensures an accurate, apples-to-apples comparison so you can select the most cost-effective shipping option.
Can I add shipping insurance to USPS shipments?
Yes, Fulfil can automatically set insurance amounts on USPS shipments using automation rules. You can configure insurance as a fixed amount, percentage of shipment value, or percentage of shipment cost. The insurance is applied before the label is generated.
Does USPS integration support batch label printing?
Yes. Fulfil's WMS allows you to batch multiple shipments together and print all USPS labels at once. You can print in PDF, PNG, or ZPL format, making it compatible with both standard and thermal label printers for high-volume operations.

Agentic ERP

Run it with your own AI agents.

Fulfil is an agentic ERP, so your USPS data isn't locked behind screens. Query and edit live records in plain English from Claude or ChatGPT over MCP, point AI agents like Claude Code and Cursor at the CLI to automate multi-step work, or vibe-code the dashboard you need as a Micro App, no developers required.

AI Platform

How Fulfil uses AI across setup, search, and everyday operations

MCP

Connect Claude and ChatGPT to your live ERP data to view and edit records

CLI

Point Claude Code, Cursor, and other AI agents at your ERP

Micro Apps

Vibe-code custom dashboards and tools with no developers

Ready to get started with USPS?

See how Fulfil integrates with USPS.

See how it works