Live rates at checkout
Show real USPS rates in the cart so customers pick the option that suits them.
All integrations
DeliveryScheduled
Connect USPS to vendor
Domestic USPS rate quoting and label printing for Priority, First-Class, and Media Mail with commercial pricing.
What you get
Everything the USPS integration ships with
Built once, supported forever — no extra middleware to babysit.
Labels on fulfillment
Generate shipping labels straight from the order when you fulfill.
Tracking back on the order
Tracking numbers and status flow back onto the order and customer notifications.
How the USPS integration works inside vendor
Offer USPS shipping at checkout. Connect USPS to show live rates, print labels, and track shipments from the order.
Add your USPS account in the admin and Vendor surfaces its rates in the cart, generates labels on fulfillment, and pulls tracking back onto the order.
What gets synced
With USPS connected you get:
- Live shipping rates at checkout.
- Shipping labels on fulfillment.
- Tracking numbers and status.
- Service levels and delivery estimates.
- Address validation where supported.
Setup
Add your USPS API credentials under Shipping in the admin.
Pick the services and regions you want to offer.
Limits & considerations
Available services and rates depend on your USPS contract and regions.
Some carriers require account-level approval for label generation.
Pairs well with
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Multi-carrier label aggregator — compare 80+ carrier rates and print labels without per-carrier contracts.
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Address verification, rate shopping, and tracking webhooks across every major US and international carrier.