What shipping services does the USPS API support?

The API supports USPS Ground Advantage, Priority Mail, Priority Mail Express for domestic shipments, and Priority Mail International, Priority Mail Express International, and Global Express Guaranteed for international shipments.

How accurate are the shipping rates?

Rates are calculated in real-time using the official USPS REST API v3 with your actual origin and destination ZIP codes. Rates include dimensional weight calculations and zone-based pricing.

Does the API support international shipping?

Yes, the API supports international shipping to over 180 countries with automatic customs form requirements (CN22/CN23) and country-specific rate calculations.

Is there a rate limit on API calls?

The default rate limit is 60 requests per minute. For higher volume needs, contact us to discuss commercial rate limits.

What happens if the USPS API is unavailable?

The API automatically falls back to cached rates when the USPS API is unavailable, ensuring your checkout process continues to work.

USPS Shipping API

Platphorm News Network

v1.1.0

USPS Rate Calculator

REST API v3

Real-time shipping rates for e-commerce. Supports domestic, international, and customs declarations.

Calculate Shipping Rates

Enter package details to get USPS shipping rates for VanAgain parts