Numverify API

Numverify is a free and simple REST API for national and international phone number validation and lookup across 232 countries, operated by APILayer (an Idera, Inc. brand). A single validate call returns whether a number is valid along with its local and international formats, country code and name, approximate location, carrier, and line type (mobile or landline). Authentication is by API key with two published bases — the legacy apilayer.net host (access_key query parameter) and the newer api.apilayer.com marketplace host (apikey header) — and access is metered by monthly request quota across free and paid plans.

Numverify API is listed with 1 API on the APIs.io network. Tagged areas include Phone Validation, Phone Numbers, Telecommunications, Data, and Validation.

Numverify API’s developer surface includes documentation, pricing, signup flow, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

33.3/100 thin ▬ flat Agent 8/100 agent aware Front door AI 3/6 light Full breakdown ↓
scored 2026-10-17 · rubric v0.24.0

1 API 1 MCP Servers

Phone Validation Phone Numbers Telecommunications Data Validation Carrier Lookup Phone Number Lookup

Kin Score

Kin Score How this is scored →
scored 2026-10-17 · rubric v0.24.0

Composite quality — 33.3/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 13.0 / 17

Operational Transparency 5.5 / 11

Contract Governance 0.0 / 10

Discoverability 6.2 / 9

Regulatory Posture 2.5 / 15

Agent readiness — 8/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Telecommunications regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/numverify: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Numverify API

GET /validate — validate a phone number and return validity, local and international formats, country, location, carrier, and line type. Read-only, single-endpoint lookup API.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Numverify API MCP Server

MCP server requiring an API key; 1 tool listed. A candidate, not confirmed as published by the provider.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Numverify Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Numverify Rate Limits

4 limits

RATE LIMITS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Numverify Authentication

2 schemes

SECURITY

Numverify Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

StatusPage

StatusPage

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: numverify
name: Numverify API
description: Numverify is a free and simple REST API for national and international phone number validation and lookup across
  232 countries, operated by APILayer (an Idera, Inc. brand). A single validate call returns whether a number is valid along
  with its local and international formats, country code and name, approximate location, carrier, and line type (mobile or
  landline). Authentication is by API key with two published bases — the legacy apilayer.net host (access_key query parameter)
  and the newer api.apilayer.com marketplace host (apikey header) — and access is metered by monthly request quota across
  free and paid plans.
type: Index
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
url: https://raw.githubusercontent.com/api-evangelist/numverify/refs/heads/main/apis.yml
created: '2026-09-16'
modified: '2026-09-16'
x-docs-platform: redoc
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Phone Validation
- Phone Numbers
- Telecommunications
- Data
- Validation
- Carrier Lookup
- Phone Number Lookup
tags_raw:
- Phone Validation
- Phone Numbers
- Telecom
- Data
- Validation
- Carrier Lookup
- Phone Number Lookup
apis:
- name: Numverify API
  description: GET /validate — validate a phone number and return validity, local and international formats, country, location,
    carrier, and line type. Read-only, single-endpoint lookup API.
  humanURL: https://numverify.com/documentation
  baseURL: https://apilayer.net/api
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  properties:
  - type: Documentation
    url: https://numverify.com/documentation
  - type: Authentication
    url: authentication/numverify-authentication.yml
  - type: ErrorCatalog
    url: errors/numverify-problem-types.yml
  - type: RateLimits
    url: rate-limits/numverify-rate-limits.yml
  - type: Plans
    url: plans/numverify-plans-pricing.yml
  - type: Conventions
    url: conventions/numverify-conventions.yml
  - type: Lifecycle
    url: lifecycle/numverify-lifecycle.yml
  - type: MCPServer
    url: mcp/numverify-mcp.yml
  - type: LLMsTxt
    url: llms/numverify-llms.txt
common:
- type: Plans
  url: plans/numverify-plans-pricing.yml
- type: RateLimits
  url: rate-limits/numverify-rate-limits.yml
- type: DomainSecurity
  url: security/numverify-domain-security.yml
- type: Website
  url: https://numverify.com
- type: Documentation
  url: https://numverify.com/documentation
- type: Pricing
  url: https://numverify.com/pricing
- type: SignUp
  url: https://numverify.com/signup
- type: TermsOfService
  url: https://www.ideracorp.com/legal/APILayer
- type: PrivacyPolicy
  url: https://www.ideracorp.com/Legal/PrivacyPolicy
- type: Blog
  url: https://blog.apilayer.com
- type: GitHubOrganization
  url: https://github.com/apilayer
- type: StatusPage
  url: https://numverify.com/api-status
- type: Packages
  url: packages/numverify-packages.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-09-16'
  status: enriched
  artifacts_added: 10
  pass: local-v3

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