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.

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Privacy Policy

Last updated: March 4, 2026

Platphorm News Network (“we”, “our”, or “us”) operates the USPS Shipping API service. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our API services.

Information We Collect

API Request Data

Origin and destination ZIP codes or postal codes
Package dimensions and weight
Declared values for customs (international shipments)
Content type descriptions

Technical Data

IP address (anonymized for analytics)
JA4H HTTP fingerprint for security and rate limiting
Request timestamps and response times
Browser/client user agent string
API endpoint accessed

How We Use Your Information

To calculate and return accurate USPS shipping rates
To improve API performance and reliability
To detect and prevent abuse, fraud, and security threats
To enforce rate limits and fair usage policies
To generate anonymized usage analytics
To comply with legal obligations

Data Security

We implement industry-standard security measures to protect your data:

All API communications are encrypted using TLS 1.3
Request fingerprinting uses non-reversible hashing
No personally identifiable shipping addresses are stored
Audit logs are retained for 30 days maximum
Rate calculations are not permanently stored

Third-Party Services

We integrate with the following third-party services:

USPS Web Tools API - For official shipping rate calculations
Vercel - For hosting and edge computing
Neon - For database storage (if enabled)

Each third-party service has its own privacy policy governing the data they process.

If you have questions about this Privacy Policy or our data practices, contact us at:

Email: Michael@barbineworldwide.com

Website: platphormnews.com