Technical guides for USPS v3 REST migration, address validation, rate limits, pricing comparisons, and shipping workflow architecture.https://revaddress.com/en-ushttps://revaddress.com/blog/checkout-guard-widget/https://revaddress.com/blog/checkout-guard-widget/Add real-time address validation and fraud risk to any checkout with one script tag. WooCommerce, Shopify, Magento, custom forms. Free tier.Wed, 15 Apr 2026 00:00:00 GMThttps://revaddress.com/blog/easypost-march-2026-migration/https://revaddress.com/blog/easypost-march-2026-migration/EasyPost's March 17, 2026 enforcement is live. See what changed, the Free Access vs BYOCA cost impact, and flat-rate alternatives after enforcement.Tue, 17 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/shipping-api-comparison-2026/https://revaddress.com/blog/shipping-api-comparison-2026/Compare EasyPost, Shippo, ShipEngine, and RevAddress for USPS. Pricing, code samples, migration cost. 2026 numbers.Tue, 17 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-migration-guide/https://revaddress.com/blog/usps-migration-guide/Step-by-step USPS Web Tools migration guide covering endpoint mapping, OAuth setup, rate-limit handling, and working v3 REST code samples.Tue, 17 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-web-tools-shutdown-2026/https://revaddress.com/blog/usps-web-tools-shutdown-2026/USPS retired the Web Tools XML API on January 25, 2026. See what broke, which platforms were affected, and the fastest migration path to the v3 REST API.Tue, 17 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/smarty-vs-revaddress/https://revaddress.com/blog/smarty-vs-revaddress/Detailed comparison of Smarty and RevAddress for USPS address validation. Pricing, batch support, caching, and API design compared side-by-side.Thu, 12 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/easypost-march-17-deadline-migration-options/https://revaddress.com/blog/easypost-march-17-deadline-migration-options/EasyPost's March 17 plan enforcement is live. Migration options with cost savings at 1K-50K labels/mo, code examples, and a 5-step checklist.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/easypost-vs-revaddress/https://revaddress.com/blog/easypost-vs-revaddress/Factual pricing comparison between EasyPost and RevAddress for USPS shipping APIs. Per-label vs flat pricing math, feature comparison, and when each wins.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/magento-usps-ac15210-fix/https://revaddress.com/blog/magento-usps-ac15210-fix/Magento's built-in USPS module broke when Web Tools retired. Drop-in v3 REST fix you can ship in one afternoon. Every step, working code.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/shipengine-vs-revaddress/https://revaddress.com/blog/shipengine-vs-revaddress/ShipEngine vs RevAddress for USPS shipping. Pricing tiers, API design, code samples, and when to pick each. Zero marketing fluff.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/shippo-vs-revaddress/https://revaddress.com/blog/shippo-vs-revaddress/Head-to-head: Shippo vs RevAddress for USPS shipping. Pricing at every volume, architecture, code samples, when to pick each.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-api-access-control-april-2026/https://revaddress.com/blog/usps-api-access-control-april-2026/USPS launches API Access Control in April 2026, restricting tracking data access. What changes, who is affected, how to prepare.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-api-package-replacement/https://revaddress.com/blog/usps-api-package-replacement/The usps-api PyPI package and usps-webtools / usps-webtools-promise npm packages are dead. Here are the working 2026 replacements.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-api-pricing-2026-what-it-really-costs/https://revaddress.com/blog/usps-api-pricing-2026-what-it-really-costs/USPS API is free but rate limits make it impractical at scale. Real direct-vs-third-party costs across four volume tiers in 2026.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-api-rate-limits-2026-what-changed/https://revaddress.com/blog/usps-api-rate-limits-2026-what-changed/USPS v3 API dropped from 6,000/min to 60/hour. Why it happened and five architecture patterns with working code to handle it in prod.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-april-2026-access-control-changes/https://revaddress.com/blog/usps-april-2026-access-control-changes/USPS is restructuring API access control in April 2026 — the second wave of breaking changes. Why migrate now, not later.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-batch-address-validation-api/https://revaddress.com/blog/usps-batch-address-validation-api/Validate up to 50 US addresses in a single API call. Parallel processing, 24-hour cache, webhook results. Integration in minutes.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-crid-mid-enrollment/https://revaddress.com/blog/usps-crid-mid-enrollment/Step-by-step USPS CRID registration, Mailer ID (MID) enrollment, EPA setup, and COP claims linking for the v3 REST API.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-oauth-troubleshooting/https://revaddress.com/blog/usps-oauth-troubleshooting/401s, 403s, or token refresh failures from USPS v3? This guide covers every OAuth error with fix recipes. CRID, MID, EPA setup.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-v3-address-validation-quickstart/https://revaddress.com/blog/usps-v3-address-validation-quickstart/Validate a US address with the USPS v3 REST API in one curl command. Working code for Python, Node.js, and curl — no XML, no USERID, no middleman.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-v3-migration-guide-nodejs-python/https://revaddress.com/blog/usps-v3-migration-guide-nodejs-python/Step-by-step migration from USPS Web Tools XML to v3 REST using the usps-v3 Python and Node SDKs.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-v3-node-quickstart/https://revaddress.com/blog/usps-v3-node-quickstart/Install the usps-v3 Node SDK. Validate addresses and track packages in minutes. TypeScript first, zero dependencies.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-v3-php-quickstart/https://revaddress.com/blog/usps-v3-php-quickstart/Install the revaddress/usps-v3-php Composer package. Validate addresses, track packages, and run labels in PHP. Works with Magento, WooCommerce, Laravel.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-v3-python-quickstart/https://revaddress.com/blog/usps-v3-python-quickstart/Install the usps-v3 Python SDK and start validating addresses, tracking, and comparing rates.ping rates in minutes. Full code examples with type hints.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-v3-sdk-comparison/https://revaddress.com/blog/usps-v3-sdk-comparison/usps-v3 SDK for Python, Node, and PHP. Automatic OAuth, validation, tracking, rates, and labels. MIT licensed, production-tested.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-web-tools-endpoint-mapping/https://revaddress.com/blog/usps-web-tools-endpoint-mapping/Definitive USPS Web Tools XML to v3 REST mapping across addresses, tracking, labels, pricing, and locations.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-web-tools-migration-checklist/https://revaddress.com/blog/usps-web-tools-migration-checklist/Step-by-step checklist for migrating from USPS Web Tools XML to the v3 REST API. OAuth, endpoint mapping, error handling.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/woocommerce-usps-migration/https://revaddress.com/blog/woocommerce-usps-migration/Replace your broken WooCommerce USPS shipping plugin with RevAddress v3 REST in one afternoon. Every hook, working code.Tue, 10 Mar 2026 00:00:00 GMThttps://revaddress.com/blog/usps-rate-limits/https://revaddress.com/blog/usps-rate-limits/Practical strategies for handling USPS v3 API rate limits. Caching, batching, queue architecture, and BYOK for production workloads.Mon, 09 Mar 2026 00:00:00 GMT