Phone Number Validator API

About the Phone Number Validator API

A phone validation API that answers in JSON from one REST call. Send a number in +E.164 form on its own, or a national number with its two-letter country code. Validation runs on Google's libphonenumber numbering-plan data, so each number is checked against the real number ranges of its country rather than a generic pattern. Location, carrier and time zones come from libphonenumber's offline geocoding and carrier maps. The carrier is the operator the number range was first allocated to, so a ported number still shows its original network, and US and Canadian numbers carry no carrier data. The disposable flag checks the number against numbers published on temporary SMS-receiving sites.

What people use it for

Account Signup Verification

When users register, check validity and flag disposable or VoIP lines before sending one-time verification SMS codes.

CRM Lead Scrubbing

Sales platforms inspect incoming prospect numbers and standardize them into E.164 format to keep contact records clean and dialable.

Outbound SMS Routing

To prevent wasted spend on unroutable text messages, delivery systems verify that recipient numbers are mobile lines rather than landlines.

Checkout Risk Screening

Payment gateways identify virtual and disposable phone numbers during checkout to detect suspicious buyer profiles before processing charges.

Contact Time Windows

Contact centers read the returned time zone and area so calls and texts go out during the recipient's local business hours.

Ways to call it

One endpoint, many ways in — REST with JSON, XML, YAML and CSV, plus GraphQL and an MCP interface for AI agents.

JSON

Default REST response

XML

Markup format

YAML

Human-readable

CSV

Tabular export

Beta

GraphQL

Query language

New

MCP

For AI agents

How it compares

Side by side with the tools people weigh Phone Number Validator against — what each one is better at, in plain terms.

Request parameters — GET /v1/phonenumbervalidator

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them. Anything not listed here is dropped rather than passed through.

Required

Optional

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curl "https://api.apiverve.com/v1/phonenumbervalidator?number=816-555-1017&country=us" \
  -H "x-api-key: YOUR_API_KEY"

Authentication

Send your key in the x-api-key header. That is the only auth step — no token exchange, and no per-endpoint scope to configure.

Response — GET /v1/phonenumbervalidator

Every APIVerve endpoint returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape.

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{
  "status": "ok",
  "error": null,
  "data": {
    "country": "US",
    "detectedCountry": "US",
    "countryName": "United States",
    "countrycode": 1,
    "numberNational": 8165551017,
    "extension": null,
    "isValid": true,
    "isMobile": true,
    "isVoip": false,
    "isDisposable": false,
    "type": "fixed_line_or_mobile",
    "isValidNumber": true,
    "nationalSignificantNumber": "8165551017",
    "location": "Missouri",
    "carrier": null,
    "timezones": [
      "America/Chicago"
    ],
    "formatted": {
      "international": "+1 816-555-1017",
      "national": "(816) 555-1017",
      "rfc": "tel:+1-816-555-1017",
      "e164": "+18165551017"
    },
    "riskScore": 0,
    "riskLevel": "low"
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Response headers

Every response carries your balance, so your own code always knows where it stands without polling anything. All four are exposed to browsers through CORS.

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change.

What a call costs — 10 credits per call

Credits are shared across every APIVerve API — one balance, one key, one bill. Failed requests never count against it, so a rejected input costs nothing.

Calls are what the credits buy at this API's rate — spend them here, on any of the other APIs, or across both. Nothing is reserved per endpoint.

Zero-code embed — one snippet, no backend

Drop an interactive Phone Number Validator form onto any page. The widget calls the API for you, so no key ever appears in your markup and there is nothing to deploy.

Changelog — Phone Number Validator API

Every change to this endpoint, newest first. Breaking changes ship as a new version and the previous one keeps serving — response fields are added, never removed or retyped in place, so an integration written against v1 keeps working.

Currently v1