contactlint-com

ContactLint offers a hosted HTTP API and remote MCP server that validates email addresses and phone numbers. It checks syntax, DNS MX records, disposable domains, role addresses, and common typos for emails, and parses and formats phone numbers. The service provides a free tier of 100 checks per month and paid plans starting at $9 for 5,000 checks. It includes batch validation, widget integration for signup forms, and detailed usage reporting. Designed for developers and AI agents, ContactLint aims to improve data quality and reduce bounce rates.

contactlint-com is listed with 1 API on the APIs.io network: ContactLint API. Tagged areas include Company, Email Validation, Phone Validation, API, and MCP.

contactlint-com’s developer surface includes documentation, API reference, getting-started guide, pricing, signup flow, and 4 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

29.5/100 thin Agent 16/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 API

CompanyEmail ValidationPhone ValidationAPIMCP

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 29.5/100 · thin

Contract Quality 7.2 / 21

Developer Ergonomics 4.9 / 17

Access Clarity 7.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 5.6 / 9

Regulatory Posture 2.1 / 15

Agent readiness — 16/100 · agent aware

Machine-Readable Contract 18 / 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 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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/.

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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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

11 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 33.7 — up to +16.6 composite points
Developer Ergonomics scores 28.6 — up to +14.3 composite points
Operational Transparency scores 0.0 — up to +13.0 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/contactlint-com/apis.yml: open an issue on github.com/api-evangelist/contactlint-com 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 →

APIs 1

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

ContactLint API

Email and phone validation API.

Security Posture 1

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

Contactlint Com Domain Security

TLSv1.3

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: contactlint-com
name: contactlint-com
description: ContactLint offers a hosted HTTP API and remote MCP server that validates email addresses and phone numbers.
  It checks syntax, DNS MX records, disposable domains, role addresses, and common typos for emails, and parses and formats
  phone numbers. The service provides a free tier of 100 checks per month and paid plans starting at $9 for 5,000 checks.
  It includes batch validation, widget integration for signup forms, and detailed usage reporting. Designed for developers
  and AI agents, ContactLint aims to improve data quality and reduce bounce rates.
url: https://artifacts.apis.io/contactlint-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: stub
x-tier-reason: harvest
specificationVersion: '0.20'
created: '2026-10-30'
modified: '2026-10-30'
tags:
- Company
- Email Validation
- Phone Validation
- API
- MCP
apis:
- name: ContactLint API
  description: Email and phone validation API.
  humanURL: https://contactlint.com/docs
  baseURL: https://contactlint.com
  openapi:
    url: openapi/contactlint-com-openapi.json
    type: OpenAPI
    version: 3.1.0
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/contactlint-com-domain-security.yml
- type: Website
  url: https://contactlint.com/
- type: Documentation
  url: https://contactlint.com/
- type: APIReference
  url: https://contactlint.com/
- type: GettingStarted
  url: https://contactlint.com/
- type: Pricing
  url: https://contactlint.com/
- type: SignUp
  url: https://contactlint.com/signup
- type: TermsOfService
  url: https://contactlint.com/terms
- type: PrivacyPolicy
  url: https://contactlint.com/privacy
image: https://contactlint.com/apple-touch-icon.png

contactlint-com API — frequently asked questions

Does contactlint-com have an API?

Yes. APIs.io lists 1 API from contactlint-com, including ContactLint API.

Is there an OpenAPI specification for the contactlint-com API?

Yes. APIs.io indexes 1 OpenAPI specification for contactlint-com, each linked for download from this page.

How do I authenticate with the contactlint-com API?

contactlint-com uses bearer-token authentication.

Is the contactlint-com API ready for AI agents?

contactlint-com has a Kin Score of 29.5 out of 100 (thin) and an Agent Readiness score of 15.5 (agent-aware), scored by API Evangelist on 2026-10-31.

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