The Postal Regulatory Commission has approved the United States Postal Service’s (USPS) proposed postage rate adjustments, which will take effect on July 12, 2026. In line with these changes, our per-mailpiece pricing will be updated accordingly. Updated Pricing

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Authentication

Authenticate each request with a Bearer token and the email of the user you are acting on behalf of.

Header

Authorization: Bearer YOUR_API_KEY USER_EMAIL

Create user on first request (optional)

If the user does not exist, send this header to create the user automatically: 

X-Create-User: true

Security

Keep API keys secret. Do not expose them in client‑side code. Route all production requests through your backend and load secrets from environment variables or a KMS.

  • Treat API keys as secrets and rotate them periodically.
  • Transmit over HTTPS only.
  • Authenticate as a specific user via the Authorization header shown above.