Shipping API Comparison 2026 — Pricing by Volume

If you’re building shipping into your app in 2026, you’ve got four real options for USPS integration: EasyPost, Shippo, ShipEngine, and RevAddress. Each makes different trade-offs on pricing, architecture, and developer experience.

This isn’t a marketing page — it’s the comparison I wish existed when I was evaluating these services. Real pricing, real code, real trade-offs.

The pricing math (verified March 2026)

Every shipping API charges differently. EasyPost charges $0.08/label (with 3,000 free/mo on their Free Access Wallet plan, or $20/mo + $0.08/label on the BYOCA plan). Shippo charges $0.05/label pay-as-you-go (or $19–$199/mo Pro plans). ShipEngine uses tiered plans ($75–$600/mo). RevAddress charges flat monthly with no per-label fees.

At low volume, EasyPost wins. Their 3,000 free labels/month is genuinely generous. If you ship under 3K/month, EasyPost’s Free Access is hard to beat on price alone.

The crossover point is ~4,000 labels/month. That’s where flat pricing starts saving real money. At 10,000 labels/month, EasyPost costs $560/mo vs RevAddress at $79/mo — that’s $5,772/year in savings. At 50,000/month, the gap is $42,732/year.

Architecture differences

This matters more than pricing for most developers:

Key differentiator: EasyPost, Shippo, and ShipEngine are all middlemen — they hold USPS credentials, negotiate rates, and add a markup. RevAddress gives you a managed USPS-focused layer over USPS v3 with flat pricing, a free tier, and optional BYOK. If you only need USPS, you’re paying a multi-carrier tax with the others.

When to pick each one

Pick EasyPost if you need 100+ carriers and money isn’t a constraint. Their multi-carrier support is genuinely the most comprehensive. But you’ll pay $0.08/label for it.

Pick Shippo if you’re on Shopify or a platform that has a native Shippo integration. Their platform integrations are their real strength, not the raw API.

Pick ShipEngine if you need multi-carrier with more predictable pricing than EasyPost. Their flat tiers make budgeting easier.

Pick RevAddress if you primarily ship USPS and want:

• Managed USPS-focused workflow coverage (no middleman markup)
• Flat monthly pricing that doesn’t scale with volume
• BYOK — bring your own USPS credentials for full control
• Open-source SDKs you can audit and self-host

Code comparison

Here’s address validation across all four. This is the most common API call — validate before you ship.

import easypost

client = easypost.EasyPostClient("EASYPOST_API_KEY")

address = client.address.create(
  street1="1600 Pennsylvania Ave NW",
  city="Washington",
  state="DC",
  zip="20500",
  country="US",
  verify=["delivery"],
)

if address.verifications.delivery.success:
  print(f"Valid: {address.street1}")
else:
  print(f"Invalid: {address.verifications.delivery.errors}")

from usps_v3 import USPSClient

client = USPSClient(api_key="rv_live_your_key_here")

result = client.addresses.validate(
  street_address="1600 Pennsylvania Ave NW",
  city="Washington",
  state="DC",
  zip_code="20500",
)

if result.dpv_confirmation == "Y":
  print(f"Valid: {result.address.street_address}")
else:
  print(f"Not deliverable: DPV={result.dpv_confirmation}")

Both work. The difference: EasyPost proxies your request through their infrastructure and charges $0.08 for it. RevAddress runs the call through a USPS-focused managed layer and includes address validation inside the monthly plan.

The March 2026 context

Three things in early 2026 changed the calculus:

1. USPS v3 REST API is the required migration target. The old Web Tools XML API was retired January 2026 — it doesn’t just return deprecation warnings, it returns errors. Every shipping platform had to migrate their backend.

2. EasyPost changed their pricing. The new per-label fee structure hit in January. March 17, 2026 is the auto-enrollment date for accounts that have not chosen a plan: they move into BYOCA ($20/mo + $0.08/label) if a payment method is on file, or lose label generation if they do not.

3. USPS Access Control changes (April 2026). USPS is tightening API access — CRID/MID enrollment, app-level approval, stricter rate limits. Services without proper enrollment will lose access.

RevAddress is BYOK-first: you run it on your own USPS enrollment (CRID and MID), so your API access belongs to you — not to a reseller’s shared credentials. If your shipping provider hasn’t completed USPS enrollment, your access is hostage to theirs.

Migration from EasyPost

If you’re moving from EasyPost to RevAddress, here’s the step-by-step:

1. Get your API key at revaddress.com/signup — takes 30 seconds
2. Install the SDK:

pip install usps-v3

npm install usps-v3

3. Replace the address validation call (see code comparison above)
4. Replace label creation:

# EasyPost: create shipment, then buy
shipment = client.shipment.create(
  from_address=from_addr,
  to_address=to_addr,
  parcel=parcel,
)
bought = client.shipment.buy(
  shipment.id,
  rate=shipment.lowest_rate(),
)
label_url = bought.postage_label.label_url

# RevAddress: single call, USPS-focused layer
label = client.labels.create(
  from_address=from_addr,
  to_address=to_addr,
  weight=weight_oz,
  mail_class="USPS_GROUND_ADVANTAGE",
  processing_category="MACHINABLE",
)
label_url = label.label_url

5. Test with your real addresses — RevAddress validates against USPS DPV (Delivery Point Validation), so you get the same accuracy as going direct
6. Switch your environment variable — EASYPOST_API_KEY → REVADDRESS_API_KEY

The honest trade-offs

RevAddress is not the right choice if:

• You ship with FedEx, UPS, and DHL alongside USPS — you’d need a multi-carrier platform
• You need carrier-negotiated rates (we pass through USPS Commercial rates, not custom-negotiated)
• You need on-premise deployment — our API runs on Cloudflare’s edge network

RevAddress is the right choice if:

• USPS is your primary or only carrier
• Per-label fees are eating into your margins
• You want to bring your own USPS credentials (BYOK)
• You want open-source SDKs you can audit
• You want a USPS-focused layer instead of paying a per-label middleman

Bottom line

At 1,000+ labels/month, the per-label pricing model costs more than flat monthly. At 10,000/month, you’re leaving nearly $9,000/year on the table with EasyPost. That’s the math.

Check the full pricing breakdown or try the API — the free proof surface gets you live address and rate validation first, then paid workflows expand as you need them.

Related

• EasyPost March 17 Enforcement: Migration Options
• USPS Web Tools Shutdown: Complete Migration Guide
• USPS v3 Address Validation Quickstart
• Full API Reference
• Pricing