Address Validator
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APIPostal addresses: US, France, overseas

Verify the address before the package ships.

Send the address exactly as the customer typed it. The API returns it standardized, with GPS coordinates, deliverability and a confidence score from 0 to 1.

Start the free trial Test an address

14-day trial, 100 validations, no credit card. Or 0.02 USDC per call, no account.

Illustrative example: the request 100 stewart st, seattle, wa, 98101, us comes back standardized as 100 Stewart Street, Seattle, WA 98101, US, with coordinates 47.6105, -122.341, deliverability residential, a confidence of 1.0 and degraded set to false.

How it works

One request, three steps.

No address database to maintain, no custom rules to write. Call the API the moment the address is entered.

  1. 01

    Send

    Your store, script or agent sends the street, city, state, ZIP code and country, as the customer entered them.

    "street": "100 stewart st"
  2. 02

    Receive

    The API returns the standardized address, its GPS coordinates, a deliverability value and a confidence score from 0 to 1.

    "line1": "100 Stewart Street"
  3. 03

    Ship

    Address confirmed: the package ships. If not, you sort it out with the customer before it goes out. An address already verified comes from the cache and is not billed again.

    "deliverability": "residential"

In the field

The right address, from packed to delivered.

In a warehouse, a worker in a yellow vest scans a package label in front of shelves of cartons.
The package ships with a verified address.
A delivery driver hands a cardboard package to a woman at her front door.
It arrives at the right door.

Two ways in

Store or agent, the same check.

The response is identical on both sides. Only access and payment differ.

A woman sticks a shipping label on a box at her workbench, in front of shelves of packages.

Subscription

Online stores

One account, one API key in the X-API-Key header, and every address is checked at checkout.

  • Create an account at /signup, key available in your dashboard
  • 14-day free trial, 100 validations, no credit card
  • Then Starter or Pro, no commitment, no automatic charge
POST /validateX-API-Key: <your key>// trial: 100 validations, 14 days{"address": {"street": …, "zip": …}}
Create an account Integration guide
A developer writes code on a laptop and an external monitor, with a city at dusk behind.

Pay per call

Developers and AI agents

No account. Each call costs 0.02 USDC via x402, on the Base network.

POST /validateX-PAYMENT: <x402 proof>// 0.02 USDC per call, Base network{"address": {"street": …, "zip": …}}
  • MCP server at /mcp, tool validate_address, free discovery
  • /manifest, /llms.txt and /AGENTS.md for your agents
Read the documentation MCP server

Live test

Try an address, no account needed.

A few free tries per day per IP address. United States, French and overseas addresses are verified; elsewhere, verification is partial.

Example: 100 stewart st · seattle · wa · 98101 · US

Your address POST /validate-form

No account. The result appears on the next page.

Plans

Three plans, no commitment.

Prices excl. VAT. No automatic charge.

Trial

$0for 14 days

  • 100 validations
  • No credit card
  • API key at signup
Start the trial

Starter

$33per month, excl. VAT

  • 2,000 validations per month
  • No commitment
  • Dashboard at /compte
Plan details

Pro

$90per month, excl. VAT

  • 10,000 validations per month
  • No commitment
  • Dashboard at /compte
Plan details

Approximate prices. Billed in euros: €29 and €79 per month, excl. VAT (exchange rate of September 2026).

Need more volume? Enterprise is a custom quote. No subscription: 0.02 USDC per validation with direct calls.

See all pricing

Coverage

What is verified, and how far.

The United States are checked with USPS (DPV); France and overseas territories with the Base Adresse Nationale. Elsewhere, verification remains partial.

United States
Optimized
Standardized address, GPS coordinates, deliverability and confidence score.
France and overseas
Verified (BAN)
Address checked against the Base Adresse Nationale (score, postcode and city compared). Other countries remain partially verified.
degraded: true
Re-check
The provider did not answer. The response says nothing about the address: it is not a rejection. Run the check again later.
Cache
An address already verified is served from the cache, so it is not billed again.

Deliverability and confidence

Values returned for a geolocated address.

  • residential1.00.99 without a GPS point
  • commercial1.0
  • unknown0.55
  • invalid0.05

Check your next addresses before they ship.

14-day free trial, 100 validations, no credit card. Or run a first test right now, no account needed.

Start the free trial Test an address