Is it one call for address, email, and phone?

No. Each check has its own endpoint: /external/validate/address, /email, and /phone. When you have all three fields, send the calls in parallel. Each check uses one credit, so a full record is three credits.

Responses come back in under 150 ms at the 95th percentile, with 99.99% average uptime. That is fast enough to check a field while the user is still typing.

Can I try the API before I sign up?

Yes. The endpoints work without a key for up to 5 checks a day per IP address. The free trial gives you 1,000 credits for 14 days, no credit card, to run your own files in the dashboard. That's 1,000 instead of the usual 100, for sign-ups until Nov 30, 2026. For a dedicated API key with higher limits, email support@dqverify.com.

What does a response look like?

JSON with the mode, the value you sent, and a result object. Field names come from DQE's validation engine, and some are French: Redressement, for example, tells you a correction was made. The API reference lists every field, and the response codes page explains each result code.

Do you store the data I send?

No. Validation inputs are processed in real time and are not retained once your request completes. Email, phone, and international address validation run on infrastructure of our affiliate DQE Software SAS in the European Union (France).

Can I check a whole file instead?

Yes. Upload a CSV in the dashboard and download it with result columns added. Files under 50,000 rows typically finish in under ten minutes. Download your results during your session, because batch output is deleted afterwards.

Catch the bad record before it reaches your database.

One REST API for address, email and phone validation. Send a value, get back the corrected record and a result code your code can branch on.

Read the API reference

1,000 free credits for 14 days. No credit card. Business email required. Offer ends Nov 30.

4.8 / 5 on G2, 39 verified reviews
We don't store your validation data

200 OK

POST/external/validate/address

Request body

{
  "address": "|350 fifth avenue||10118|new york",
  "country": "USA"
}

Response

{  "mode": "rnvp",  "result": {    "1": {      "Adresse": "350 5TH AVE",      "Localite": "NEW YORK",      "Province": "NY",      "CodePostal": "10118",      "DQELibErreur": "Correct address",      "DQECodeDetail": "10"    }  }}

StandardizedSave 350 5TH AVE, NEW YORK, NY 10118

Sample data, responses abridged. What each code means

Make your first call before you sign up.

1Run a samplePick cURL, Node.js or Python below and run it as written. No key and no sign-up: each IP gets 5 calls a day.
2Start free with 1,000 credits14 days, no credit card, business email required. Upload your own CSV in the dashboard. Offer ends Nov 30.
3Get a dedicated keyWhen you are ready for production volume and higher limits, email our support team.support@dqverify.com

BASE=https://api.dqverify.com/api/external/validate

# US address as |street||ZIP|city
curl -X POST $BASE/address -H "Content-Type: application/json" \
  -d '{"address": "|350 fifth avenue||10118|new york", "country": "USA"}'

curl -X POST $BASE/email -H "Content-Type: application/json" \
  -d '{"email": "dana.reyes@gmail.con"}'

curl -X POST $BASE/phone -H "Content-Type: application/json" \
  -d '{"phone": "+12125551234", "country": "USA"}'

One sign-up. Three calls at once.

Each check has its own endpoint and uses one credit, so a full record is three requests you send together. Here is one new customer going through.

signup.js

// Dana's sign-up formconst form = {  // US address as |street||ZIP|city  address: '|350 fifth avenue||10118|new york',  email: 'dana.reyes@gmail.con',  phone: '+12125551234',} // One endpoint per check, sent togetherconst [address, email, phone] = await Promise.all([  check('address', { address: form.address }),  check('email', { email: form.email }),  check('phone', { phone: form.phone }),])

New sign-upDana ReyesReady to save

AddressStandardized350 fifth avenue, new york 10118350 5TH AVE, NEW YORK, NY 10118DQECodeDetail: "10"
EmailTypo founddana.reyes@gmail.conDid you mean dana.reyes@gmail.com?Redressement: 1
PhoneValid mobile+1 212 555 1234Mobile line, not portedType: "MOBILE"

3 of 3 credits usedOne credit per check

Sample record and illustrative person, not customer data. Return order and timing are illustrative.

Check the record wherever it comes in.

Address, email and phone work the same way, so one integration covers all three, in every place a record is created.

In your sign-up and checkout forms
Call from your backend when the form is sent, and show the suggestion before the record is saved.
One POST per field
When your team creates a record
Phone orders, imports and partner feeds never see your form. Run the same calls when the record lands in your CRM or back office.
The same endpoints, from any service
Before a batch job
Upload a CSV in the dashboard and download it with result columns added. No code needed.
How batch files work

Before you go live.

The answers your code review and your security team will ask for, in one place.

API reference Response codes

Base URL: https://api.dqverify.com/api
Endpoints: POST /external/validate/addressPOST /external/validate/emailPOST /external/validate/phone
Without a key: 5 calls a day per IP address, to try it out.
Production key: A dedicated API key with higher limits, from support@dqverify.com.
Response time: Under 150 ms at the 95th percentile.
Uptime: 99.99% average uptime. Contractual SLAs are part of Enterprise agreements.
Cost: 1 credit per check, so a record with address, email and phone is 3 credits.
Your data: We don't store your validation data. Email, phone and international address checks run in the EU (France), on infrastructure of our affiliate DQE Software SAS.
US addresses: Processed with USPS CASS Certified software supplied by a USPS licensee.
Certification: Our parent company, DQE Software SAS, is ISO/IEC 27001:2022 certified.

Pay for what you verify.

No subscription and no monthly minimum. Each check uses one credit, so an address, email, and phone for one customer is three credits.

See every volume tier

First
Try it free
1,000 credits · 14 days
Sign up with a business email. No credit card. Run real records by API or CSV upload.
Then
Buy a credit pack
From $275 for 20,000 credits
One-time purchase, valid for 12 months. Buy more when you run low. Nothing renews automatically.
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Questions from developers

Calls, speed, keys, and what comes back.

More answers in the full FAQ, or email sales@dqverify.com.

Catch the next bad record before it's saved.

Try the endpoints now without a key, up to 5 calls a day per IP address. When you're ready to test on your own data, start free with 1,000 credits.

Book a demo