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Technical guides for USPS API migration and shipping infrastructure.

March 9, 2026 · 12 min · Migration Guide

USPS Web Tools to v3 REST: Complete Migration Guide

Step-by-step guide to migrating from USPS Web Tools XML API to the new v3 REST API. Endpoint mapping, OAuth setup, rate limit handling, and code samples.

March 9, 2026 · 8 min · Architecture

USPS API Rate Limits: How to Handle 60 req/hr in Production

Practical strategies for handling USPS v3 API rate limits. Caching, batching, queue architecture, and BYOK for production workloads.