PostGrid vs RevAddress: Address Validation Compared (2026)

PostGrid and RevAddress both check US addresses, and both bill a flat monthly fee, so the pricing tables look like they answer the same question. They do not. PostGrid is an address-verification and direct-mail platform: verify, autocomplete, then print and post a physical letter. RevAddress is a USPS API layer where validation is the front door to rates, tracking and labels.

The useful question is not which one validates better. It is whether validation is the whole job, and whether the workflow ends at a mailbox or a package. PostGrid figures below were read from PostGrid’s pricing page on August 23, 2026.

What PostGrid charges

US and Canada Standard, the plan most readers of this page are comparing:

500 free credits to start. International verification across 245-plus countries is a separate ladder and a much steeper one: $70, $300 and $550 a month on annual commitment for 1,000, 5,000 and 10,000 lookups.

Two footnotes on that table do more to your bill than the headline rate.

Geocoding is an additional lookup. PostGrid’s own feature comparison marks “Geocoding (Lat and Long)” with an asterisk reading Additional Lookup. If your pipeline validates an address and also wants coordinates, that record draws two lookups, not one. At 10,000 addresses a month needing both, the Business plan’s 10,000 covers 5,000 addresses.

Bulk verification is a separate meter. The monthly plan lookups are for the real-time API. Bulk, which handles up to a million addresses in one upload, is priced per verification: $0.05 from 100 to 10,000 records, $0.03 from 10,000 to 100,000, quote above that, with 100 free to test. So a one-time 25,000-record list cleanse is about $750 on top of whatever plan you hold.

Neither of those is hidden. Both sit in small type under a table most people read in ten seconds.

What RevAddress charges

Flat monthly, metered on API requests rather than address lookups:

One request is one call to any endpoint, so a rate quote and a validation cost the same. Geocoding carries no surcharge and runs on the free tier. Batch is included on Growth and above rather than metered separately, at 50 addresses per call.

Side by side, honestly

For validation alone, PostGrid is cheaper below 50,000 a month and it is not close at 10,000. $40 against $79 is a real difference and no amount of feature framing changes it. If you will never ship a package, never need coordinates in the same call, and never bulk-clean a list, the Business plan is the better buy and you can stop reading.

Where it turns is at the edges of that sentence. Coordinates, bulk, and shipping are each a separate line item at PostGrid and each is included at RevAddress. Add all three and the comparison inverts well before 50,000.

What each one includes

Read that by column. PostGrid is wider across verification and physical mail: autocomplete, Canada, print and post, and published SOC-2 and HIPAA coverage at the upper tiers are real capabilities RevAddress does not have. RevAddress is deeper into USPS shipping: rates, service standards, tracking and labels that PostGrid does not touch at any price.

If the job is validate then mail a letter, PostGrid does that end to end. If the job is validate then ship a package, RevAddress does that end to end. Neither substitutes for the other’s core work.

The certification and license difference

PostGrid states on its pricing page that its address verification is CASS and SERP certified, covering the US and Canadian postal standards. It holds that data itself, so nothing in the flow requires an agreement between you and a postal authority.

RevAddress is not a CASS-certified vendor, and the product is split in two because the data underneath has two different owners.

Free, no postal agreement. Standardization, geocoding and address extract run against US Census Bureau address data, 1,000 requests a month, no card. This puts an address into correct form and returns coordinates. It does not tell you whether mail arrives.

DPV and the shipping endpoints, on your USPS license. ZIP+4, DPV confirmation, the CMRA, vacant and business flags, rates, service standards and tracking run against the USPS Addresses API with credentials you hold. You sign the USPS agreement and fund the Enterprise Payment Account; we manage the OAuth lifecycle, the caching, the rate-limit budgeting and the retries. The USPS API pricing guide covers the fee curve and the signature sequence, which takes weeks rather than an afternoon.

That is the trade in one line: PostGrid asks you to sign nothing and charges per lookup class. RevAddress asks you to hold your own USPS license, and in exchange the geocoding, the batch and the shipping stack stop being separate bills.

The code

Both are one POST for a validation. PostGrid’s real-time verification endpoint, from their API docs:

curl -X POST "https://api.postgrid.com/v1/addver/verifications" \
-H "x-api-key: YOUR_POSTGRID_KEY" \
-H "Content-Type: application/json" \
-d '{
  "address": {
    "line1": "1600 Pennsylvania Ave NW",
    "city": "Washington",
    "provinceOrState": "DC",
    "postalOrZip": "20500"
  }
}'

curl -X POST "https://api.revaddress.com/api/address/validate" \
-H "X-API-Key: rv_live_your_key" \
-H "Content-Type: application/json" \
-d '{
  "streetAddress": "1600 Pennsylvania Ave NW",
  "city": "Washington",
  "state": "DC",
  "ZIPCode": "20500"
}'

Same shape, and the field names differ in ways aliases absorb: line1, address1, street_address, zip and postal_code all resolve, so a port rarely needs a rename pass.

The divergence is the second call. The key that validated the address also quotes a rate:

curl -X POST "https://api.revaddress.com/api/rates" \
-H "X-API-Key: rv_live_your_key" \
-H "Content-Type: application/json" \
-d '{
  "originZIP": "10001",
  "destinationZIP": "20500",
  "weight": 16,
  "mailClass": "USPS_GROUND_ADVANTAGE"
}'

There is no PostGrid equivalent, because rate shopping is not what PostGrid sells. That is the cost the pricing table hides: with a validation-only vendor, the day your product ships something you are onboarding a second API, a second key and a second bill.

When to choose PostGrid

• Canadian addresses. PostGrid covers Canada Post standards. RevAddress is US only.
• Autocomplete at the point of entry. PostGrid has a suggestion API; RevAddress has none.
• Physical direct mail. Letters, postcards and cheques, printed and posted. RevAddress prints nothing.
• Validation is the whole job at moderate volume. At 10,000 lookups a month, $40 beats $79 and the extra scope is scope you are not using.
• You need a vendor that holds the postal data. No USPS agreement to sign, ever.

When to choose RevAddress

• USPS shipping is in the workflow, or will be. One key for validation, rates, tracking and labels.
• You need coordinates on most records. Geocoding is included rather than a second lookup.
• You clean lists regularly. Batch draws the plan allowance instead of a separate per-record meter, and a 24-hour cache means re-running the same list the same day is free.
• You already hold USPS credentials. Bring them and skip paying a second party for data you are licensed to read.
• Free is the right price for standardization. 1,000 requests a month with no card and no agreement.

Moving US validation across

If PostGrid is doing USPS validation for you and you want to consolidate:

1. Get a free key at revaddress.com/signup. 1,000 requests a month, no card.
2. Install the SDK if you want one: pip install usps-v3 or npm install usps-v3.
3. Swap the call. Replace POST /v1/addver/verifications with POST /api/address/validate. The aliases mean line1 and postalOrZip need only a shallow rename.
4. Point bulk jobs at POST /api/batch/validate, 50 per call, Growth and above.
5. Connect your USPS credentials if you need DPV. Start the license process first; it is the long pole.
6. Keep PostGrid for direct mail and Canada if you use them. The two coexist; you are only moving US validation.

Swapping the endpoint is usually an hour or two. The USPS agreement is not, so sequence it first.

Sources

PostGrid plan prices, lookup allowances, overage rates, the geocoding footnote, the bulk verification meter and the certification claim all come from the PostGrid address verification pricing page, read on August 23, 2026. Vendor pricing changes without notice; check the page before budgeting. RevAddress prices are on the pricing page, and the batch limit, plan gate and cache duration are properties of the API.

Start here

• Free API key — 1,000 requests a month, no card, no USPS agreement
• RevAddress vs PostGrid — the current side-by-side product analysis
• Full pricing and the API reference with live try-it
• One list, not an integration? Clean a file from $19