NumLookupAPI

NumLookupAPI is a phone number validation and lookup REST API from everapi. A single GET request validates a phone number and returns whether it is valid along with its local and international formats, country prefix, ISO country code and name, geographic location, carrier, and line type (mobile, landline, etc.). It offers a free tier of 100 requests per month, is authenticated with a simple API key, and is used for phone verification, data validation, and caller identity enrichment.

NumLookupAPI publishes 2 API contracts indexed on the APIs.io network: Account API and Validation API. Tagged areas include Number Verification, Phone Validation, Phone Number Lookup, Carrier Lookup, and Line Type.

The NumLookupAPI catalog on APIs.io includes 1 Spectral governance ruleset.

NumLookupAPI’s developer surface includes authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

28.3/100 thin ▬ flat Agent 27/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Number Verification Phone Validation Phone Number Lookup Carrier LookupLine TypeVerification Data ValidationCaller Identity

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 28.3/100 · thin

Contract Quality 10.8 / 21

Developer Ergonomics 5.1 / 17

Access Clarity 1.3 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.4 / 10

Discoverability 5.6 / 9

Regulatory Posture 1.5 / 15

Agent readiness — 27/100 · agent aware

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 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

5 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 7.9 — up to +18.4 composite points
Developer Ergonomics scores 29.8 — up to +14.0 composite points
Contract Quality scores 50.8 — up to +12.3 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/numlookupapi/apis.yml: open an issue on github.com/api-evangelist/numlookupapi to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

NumLookupAPI Account API

Account quota and usage status.

NumLookupAPI Validation API

Phone number validation and lookup.

Open Collections 3

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

NumLookup Account API

OPEN COLLECTION

NumLookup Account Validation API

OPEN COLLECTION

NumLookupAPI

OPEN COLLECTION

NumLookupAPI pricing

Not yet checked against NumLookupAPI's own pricing page. Compiled by API Evangelist on 2026-07-12 from numlookupapi.com/pricing; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free free	Free
Basic paid	—
Pro paid	—
Scale paid	—
Custom enterprise	—

Plan details, limits and sources →

Rate limits

Free Monthly Quota: 100 per month requests
Free Per-Minute Rate: 10 per minute requests
Basic Monthly Quota: 5000 per month requests

Compiled by API Evangelist, not yet checked against NumLookupAPI's documentation. All 6 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Numlookupapi Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Numlookupapi Rate Limits

6 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

NumLookupAPI

SLA

FinOps 1

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

Numlookupapi Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

NumLookupAPI API Rules

56 rules · 54 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Numlookupapi Authentication

apiKey · 2 schemes

SECURITY

Numlookupapi Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Numlookupapi Agentic Access

2 operations

2 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

Authentication

Authentication

DomainSecurity

DomainSecurity

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

Website

Website

Source (apis.yml)

aid: numlookupapi
url: https://raw.githubusercontent.com/api-evangelist/numlookupapi/refs/heads/main/apis.yml
name: NumLookupAPI
kind: company
description: NumLookupAPI is a phone number validation and lookup REST API from everapi. A single GET request validates a
  phone number and returns whether it is valid along with its local and international formats, country prefix, ISO country
  code and name, geographic location, carrier, and line type (mobile, landline, etc.). It offers a free tier of 100 requests
  per month, is authenticated with a simple API key, and is used for phone verification, data validation, and caller identity
  enrichment.
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: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/numlookupapi.png
tags:
- Number Verification
- Phone Validation
- Phone Number Lookup
- Carrier Lookup
- Line Type
- Verification
- Data Validation
- Caller Identity
created: '2026-07-12'
modified: '2026-07-12'
specificationVersion: '0.23'
apis:
- aid: numlookupapi:numlookupapi-account-api
  name: NumLookupAPI Account API
  description: Account quota and usage status.
  humanURL: https://numlookupapi.com/docs/validate
  baseURL: https://api.numlookupapi.com/v1
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/numlookupapi-account-api-openapi.yml
  - type: Documentation
    url: https://numlookupapi.com/docs
  - type: APIReference
    url: https://numlookupapi.com/docs/validate
  - type: PostmanCollection
    url: collections/numlookupapi.postman_collection.json
  - type: OpenCollection
    url: collections/numlookupapi.opencollection.json
  - type: APIReference
    url: https://numlookupapi.com/docs/status
- aid: numlookupapi:numlookupapi-validation-api
  name: NumLookupAPI Validation API
  description: Phone number validation and lookup.
  humanURL: https://numlookupapi.com/docs/validate
  baseURL: https://api.numlookupapi.com/v1
  tags:
  - Validation
  properties:
  - type: OpenAPI
    url: openapi/numlookupapi-validation-api-openapi.yml
  - type: Documentation
    url: https://numlookupapi.com/docs
  - type: APIReference
    url: https://numlookupapi.com/docs/validate
  - type: PostmanCollection
    url: collections/numlookupapi.postman_collection.json
  - type: OpenCollection
    url: collections/numlookupapi.opencollection.json
  - type: APIReference
    url: https://numlookupapi.com/docs/status
common:
- type: AgenticAccess
  url: agentic-access/numlookupapi-agentic-access.yml
- type: Authentication
  url: authentication/numlookupapi-authentication.yml
- type: DomainSecurity
  url: security/numlookupapi-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/everapihq
- type: LinkedIn
  url: https://www.linkedin.com/company/everapi
- type: Website
  url: https://numlookupapi.com
- type: Documentation
  url: https://numlookupapi.com/docs
- type: Plans
  url: plans/numlookupapi-plans-pricing.yml
- type: RateLimits
  url: rate-limits/numlookupapi-rate-limits.yml
- type: FinOps
  url: finops/numlookupapi-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

NumLookupAPI — frequently asked questions

Does NumLookupAPI have an API?

Yes. APIs.io lists 2 APIs from NumLookupAPI, including NumLookupAPI Account API and NumLookupAPI Validation API.

Is there an OpenAPI specification for the NumLookupAPI?

Yes. APIs.io indexes 2 OpenAPI specifications for NumLookupAPI, each linked for download from this page.

How do I authenticate with the NumLookupAPI?

NumLookupAPI uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as Numlookupapi Authentication.

How much does the NumLookupAPI cost?

APIs.io lists 5 pricing plans for NumLookupAPI, with each plan's price, limits and inclusions under Pricing on this page.

Is the NumLookupAPI ready for AI agents?

NumLookupAPI has a Kin Score of 28.3 out of 100 (thin) and an Agent Readiness score of 26.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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