What you need before you start
To buy a USPS shipping label with Bitcoin you need three things: the package dimensions and weight, the sender and recipient addresses, and a Bitcoin wallet with enough BTC to cover the label cost plus standard mempool fees. You don't need a CryptoPostage account, a USPS account, or a credit card.
Step 1: Enter your package details
Open CryptoPostage and go to the label tool. Enter the package weight in ounces and the dimensions (length, width, height in inches). For standard small packages, First-Class Package is typically the most economical service. For packages over 15.999 oz, Priority Mail or Ground Advantage will be shown. The tool fetches live rates — what you see is what USPS charges.
Step 2: Enter shipping addresses
Fill in the sender and recipient addresses. USPS requires both a complete from-address and to-address for all labels. CryptoPostage encrypts these addresses immediately on submission using AES-256-GCM. The decryption key is held only until the label is purchased, then permanently destroyed.
Step 3: Select a USPS service
The rate comparison shows all available USPS services for your package: First-Class Package (up to 15.999 oz), Priority Mail (1–3 days), Priority Mail Express (overnight guarantee), and Ground Advantage (2–5 days, up to 70 lbs). Select the service that fits your timeline and budget.
Step 4: Pay with Bitcoin
Choose Bitcoin (BTC) as your payment method. A unique Bitcoin address is generated for your specific order. The USD carrier rate is converted to BTC at the current exchange rate and locked for the payment window (typically 60 minutes). Send the exact BTC amount shown to the invoice address from any standard Bitcoin wallet.
Step 5: Wait for confirmation
Bitcoin transactions require one on-chain confirmation before the label is generated. At standard mempool fees, this takes 10–20 minutes. For time-sensitive shipments, use a slightly higher transaction fee to prioritize your transaction for the next block.
Step 6: Download and print
After confirmation, your USPS label PDF is generated automatically and available to download from your order page. Print on US Letter paper (the label will be formatted to fit) or on a 4×6 thermal printer. Attach the label to the largest flat side of the package and drop off at any USPS location or leave for carrier pickup.