Buy USPS postage with Apple Pay, Google Pay, or Bitcoin super-fast!
Buy USPS postage with Apple Pay, Google Pay, or Bitcoin super-fast!
We'll email you an invoice for worth of bitcoin.
Your email
REQUIRED We must be able to reach you to complete this purchase

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
Small button
Buy postage at Stampnik
Customized URL