Ship with USPS.
No middleman.
Direct USPS v3 REST API access. Flat monthly pricing instead of per-label fees. 162 tests. 29 routes. USPS-approved. Built for developers who ship.
<AddressValidateRequest USERID="...">
<Address>
<Address1>Suite 100</Address1>
<Address2>1600 Pennsylvania Ave</Address2>
<City>Washington</City>
<State>DC</State>
<Zip5>20500</Zip5>
</Address>
</AddressValidateRequest>GET /api/address/validate
X-API-Key: rv_live_a1b2c3...
// Response
{
"street": "1600 PENNSYLVANIA AVE NW",
"city": "WASHINGTON",
"state": "DC",
"zip": "20500-0005",
"dpv": "Y",
"vacant": false
}Why developers switch to RevAddress
USPS retired XML Web Tools. The v3 REST API has a 60 req/hr rate limit. Middlemen charge per-label. We fixed all three.
Direct USPS Access
Your requests hit USPS servers. No proxy markup. No data harvesting. Your credentials, your relationship, our infrastructure.
Flat Monthly Pricing
EasyPost charges $0.05/label. Shippo adds $19/mo + fees. We charge a flat monthly rate. Ship 10 labels or 10,000 — same price.
Rate Limit Solved
USPS caps direct access at 60 req/hr. Our intelligent caching, request batching, and token management give you up to 600 req/min.
BYOK Support
Bring Your Own Keys. Use your USPS Developer Portal credentials with our infrastructure. AES-GCM encrypted. Your data stays yours.
162 Tests. 29 Routes.
Not a wrapper around a wrapper. Production-grade Cloudflare Worker with D1, R2, Durable Objects, Queues, and real test coverage.
Drop-in Migration
WooCommerce, Magento, osCommerce modules. Python + Node.js SDKs. Swap your XML endpoint for REST in one afternoon.
The real cost of shipping APIs
| Platform | Monthly Base | Per Label | 1,000 Labels/mo | BYOK |
|---|---|---|---|---|
| EasyPost | $0 | $0.05 | $50/mo | No |
| Shippo | $19 | $0.05 | $69/mo | No |
| Direct USPS | $0 | $0 | 60 req/hr cap | N/A |
| RevAddress | $29 | $0 | $29/mo flat | Yes |
29 routes. One API key.
Address validation, tracking, labels, prices, service standards, locations, and more. Every USPS v3 endpoint, wrapped in a clean REST interface with proper error handling.
# Install
pip install usps-v3
# Validate an address
from usps_v3 import Client
client = Client("your_api_key")
result = client.addresses.validate(
street="1600 Pennsylvania Ave",
city="Washington",
state="DC",
zip_code="20500"
)
print(result.zip) # "20500-0005"
print(result.dpv) # "Y" (deliverable)Start shipping in 5 minutes
Get your API key, validate an address, create a label. Flat pricing, no surprises, no middleman fees.