Buy USPS postage with Apple Pay, Google Pay, or Bitcoin super-fast!
Buy USPS postage with Apple Pay, Google Pay, or Bitcoin super-fast!

New USPS Rates Go Live July 13, 2025

Starting on July 13th 2025, USPS will roll out new pricing for some service levels. For example, Priority Mail small flat-rate boxes will go up by more than 13%!

As always, we're committed to keeping your shipping costs down & you can continue to enjoy great savings on flat-rate packages. Stay savvy and keep shipping smart with Stampnik!

API Tools

Use this tool to prefill our label form using a custom Stampnik URL. Save time when shipping multiple packages, helping a customer save on return shipping, or just save time on your next label order.

Here are some example links you can make...

Step 1

Choose sections to prefill
USPS Priority USPS Express USPS Ground Advantage USPS Media Mail
Flat-rate Custom
Box
Small
✓
Box
Medium
✓
Box
Large
✓
Box
Large Board Game
✓
Envelope
Letter
✓
Envelope
Legal
✓
Envelope
Padded
✓
Envelope
Small
✓
Envelope
Window
✓
Envelope
Gift-card
✓
Express Envelope
Letter
✓
Express Envelope
Legal
✓
Express Envelope
Padded
✓
First-Class doesn't support flat-rate packages
Flat-rate Weight Limit
box - 70 pounds | envelope - 4 pounds
lbs oz
in × in × in

Step 2

Copy the HTML for one of the buttons
Large button
Buy postage at Stampnik Copy
Small button
Buy postage at Stampnik Copy
Customized URL
Copy