Abstract API Phone Validation website screenshot

Abstract API Phone Validation

Abstract API's Phone Number Validation & Verification API validates and verifies a phone number in a single REST request. Given a number (ideally in E.164 format) it returns whether the number is valid, its local and international formats, the country, the registered location, the line type (mobile, landline, VoIP, and more), and the carrier - useful for form validation, lead scoring, fraud prevention, and cleaning phone data. The endpoint is a single authenticated GET call with the API key passed as a query parameter, and Abstract offers a free tier alongside paid plans. Phone Validation is one product in the broader Abstract API suite, which also includes email validation, IP geolocation, company enrichment, and other data APIs; each product has its own host and its own API key.

Abstract API Phone Validation publishes 1 API on the APIs.io network: Phone Validation API. Tagged areas include Number Verification, Phone Validation, Phone Number, Phone Number Lookup, and Verification.

Abstract API Phone Validation’s developer surface includes authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
35.8/100 thin ▬ flat Agent 35/100 agent ready saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0
AccessFreemiumOpen⚡ Free to try
1 APIs
Number VerificationPhone ValidationPhone NumberPhone Number LookupVerificationCarrier LookupLine TypeData Validation

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0
Composite quality — 35.8/100 · thin
Contract Quality 12.0 / 21
Developer Ergonomics 4.9 / 17
Access Clarity 6.7 / 17
Operational Transparency 2.6 / 11
Contract Governance 0.0 / 10
Discoverability 5.8 / 9
Regulatory Posture 2.5 / 15
Agent readiness — 35/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 6 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 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 4 / 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.
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/abstractapi-phone: 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.

Abstract API Phone Validation Phone Validation API

Validate and verify a phone number and return carrier, line type, and location.

Open Collections 3

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Abstract API Phone Validation API

OPEN COLLECTION

Abstract API Phone Validation

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Abstractapi Phone Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Abstractapi Phone Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Abstractapi Phone Finops

FINOPS

Security Posture 2

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

Abstractapi Phone Authentication

apiKey · 1 scheme

SECURITY

Abstractapi Phone Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Abstractapi Phone Agentic Access

1 operation

1 operations · 0 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans
Plans
 FinOps
FinOps

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: abstractapi-phone
url: https://raw.githubusercontent.com/api-evangelist/abstractapi-phone/refs/heads/main/apis.yml
name: Abstract API Phone Validation
kind: company
description: Abstract API's Phone Number Validation & Verification API validates and verifies a phone number in a single REST
  request. Given a number (ideally in E.164 format) it returns whether the number is valid, its local and international formats,
  the country, the registered location, the line type (mobile, landline, VoIP, and more), and the carrier - useful for form
  validation, lead scoring, fraud prevention, and cleaning phone data. The endpoint is a single authenticated GET call with
  the API key passed as a query parameter, and Abstract offers a free tier alongside paid plans. Phone Validation is one product
  in the broader Abstract API suite, which also includes email validation, IP geolocation, company enrichment, and other data
  APIs; each product has its own host and its own API key.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: open
  trial: false
  try_now: true
  public: true
  label: Freemium · Open access
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/abstractapi-phone.png
tags:
- Number Verification
- Phone Validation
- Phone Number
- Phone Number Lookup
- Verification
- Carrier Lookup
- Line Type
- Data Validation
created: '2026-07-12'
modified: '2026-07-12'
specificationVersion: '0.23'
apis:
- aid: abstractapi-phone:abstractapi-phone-phone-validation-api
  name: Abstract API Phone Validation Phone Validation API
  description: Validate and verify a phone number and return carrier, line type, and location.
  humanURL: https://www.abstractapi.com/api/phone-validation-api
  baseURL: https://phonevalidation.abstractapi.com/v1
  tags:
  - Phone Validation
  properties:
  - type: OpenAPI
    url: openapi/abstractapi-phone-phone-validation-api-openapi.yml
  - type: Documentation
    url: https://www.abstractapi.com/api/phone-validation-api
  - type: APIReference
    url: https://www.abstractapi.com/api/phone-validation-api
common:
- type: AgenticAccess
  url: agentic-access/abstractapi-phone-agentic-access.yml
- type: DomainSecurity
  url: security/abstractapi-phone-domain-security.yml
- type: Authentication
  url: authentication/abstractapi-phone-authentication.yml
- type: GitHubOrganization
  url: https://github.com/abstractapi
- type: LinkedIn
  url: https://www.linkedin.com/company/abstract-api
- type: Website
  url: https://www.abstractapi.com
- type: Documentation
  url: https://www.abstractapi.com/api/phone-validation-api
- type: Plans
  url: plans/abstractapi-phone-plans-pricing.yml
- type: RateLimits
  url: rate-limits/abstractapi-phone-rate-limits.yml
- type: FinOps
  url: finops/abstractapi-phone-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: abstract-api
x-relationship: product

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