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Changelog

API releases and USPS migration dates, newest first.

The entries below record past releases, and some describe offers we no longer make. Under the current terms (version 2026-10-01), free access uses Census data, and USPS verification needs a paid plan and purchased credits. The March “no per-lookup fees” and free-USPS lines no longer apply. See current pricing and the terms.

v1.4.0 Feature

API keys now arrive by email

  • Paid checkout sends a welcome email with the API key (through Resend), a backup if the key is lost
  • Free signup asks for an email address, used for onboarding mail and key recovery
  • Signup and checkout save the key in localStorage, so the dashboard opens without pasting it
  • Fixed: sandbox keys now start with rv_test_ (they were issued as rv_live_)
  • The docs gained a quickstart: a first API response in 60 seconds
v1.3.0 Feature

BYOK and Stripe billing go live

  • Bring your own key (BYOK): connect your own USPS credentials, stored encrypted in D1 and served through Durable Objects
  • Each merchant runs in its own Durable Object, with a shared pool as the fallback
  • Stored USPS credentials are encrypted with AES-GCM
  • Stripe Checkout issues the API key through a webhook once payment clears
  • A new key can be retrieved once; the stored copy is cleared after the first read
  • Monthly request caps by tier: Starter 5K, Growth 25K, Pro 100K, Enterprise unlimited
v1.2.0 Feature

Python and Node.js SDKs published

  • usps-v3 on PyPI (v1.0.2): 67 tests and nine modules, including addresses, tracking, labels, prices, standards and locations
  • usps-v3 on npm (v1.0.2): TypeScript, ESM and CommonJS builds, a file-based token cache
v1.1.0 Feature

Batch validation and rate shopping added

  • Batch address validation: POST /api/address/validate/batch takes up to 50 addresses per request
  • Rate shopping: GET /api/rates compares USPS service prices with delivery estimates
  • Rate limiting in two layers: a native burst limiter (under 1 ms) and a global KV counter for billing
  • Usage is metered in Analytics Engine and archived to D1 for audit
v1.0.0 Launch

RevAddress API goes live

  • API routes for addresses, tracking, labels, prices, service standards, locations and ZIP Codes
  • 162 tests passing
  • USPS-approved app: REVASSEROSSHIP
  • USPS OAuth tokens managed and refreshed automatically
  • Runs on Cloudflare Workers, deployed at the edge
  • D1 holds API keys, usage logs and merchant records
  • Repeat address lookups are served from a KV cache
  • Shipping labels are stored in R2 as PDF or PNG
Notice

USPS sets Web Tools shutdown dates

  • June 30, 2026: USPS Web Tools (the XML APIs) shut down permanently
  • March 17, 2026: EasyPost auto-enrolls all accounts into their USPS integration ($0.05/label)
  • April 2026: USPS begins access control enforcement on v3 endpoints
  • RevAddress provides USPS v3 developer tooling: SDKs, credential management, caching, flat monthly pricing and no per-lookup fees

Follow releases

Larger changes and USPS deadlines are written up on the blog, which has an RSS feed.

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