EmailKind

EmailKind provides a single API endpoint that identifies the exact email service provider behind any email address, covering Google Workspace, Microsoft 365, Zoho and over 150 other providers. It also distinguishes business versus personal accounts, detects disposable addresses, and enriches the data with company information, all in one call.

EmailKind publishes 2 API contracts indexed on the APIs.io network: Classify API and Signup API. Tagged areas include Email, Email Verification, Data Enrichment, and Software-as-a-Service.

The EmailKind catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

EmailKind’s developer surface includes authentication, pricing, getting-started guide, documentation, API reference, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

46.0/100 developing Agent 31/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 MCP Servers 1 Agent Skills

Email Email Verification Data Enrichment Software-as-a-Service

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 46.0/100 · developing

Contract Quality 13.9 / 21

Developer Ergonomics 7.2 / 17

Access Clarity 10.5 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 4.8 / 9

Regulatory Posture 2.8 / 15

Agent readiness — 31/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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

MCP Tool Quality 6 / 6

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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/emailkind-com/"><img src="https://apis.io/badge/emailkind-com/card.svg" alt="EmailKind on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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

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) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
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) Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →

6 more unmet checks in the Agent Readiness table above.

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

Operational Transparency scores 0.0 — up to +13.0 composite points Ask about this →
Developer Ergonomics scores 42.3 — up to +11.5 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/emailkind-com/apis.yml: open an issue on github.com/api-evangelist/emailkind-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 →

Standards implemented 2

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

EmailKind Classify API

The Classify API from EmailKind — 2 operation(s) for classify.

EmailKind Signup API

The Signup API from EmailKind — 2 operation(s) for signup.

MCP Servers 1

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

EmailKind MCP Server

Remote MCP server at emailkind.com requiring an API key.

MCP SERVER

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

emailkind-com-signup-flow

AGENT SKILL

EmailKind API pricing

Prices published by EmailKind, read 2026-11-06 from emailkind.com/pricing.

Plan	Price
Free	$0/month
Starter	$14/month
Growth	$34/month
Scale	$79/month
Enterprise	Contact Us →

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

EmailKind Plans Pricing

5 plans

PLANS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Emailkind Com Context

12 classes · 39 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

EmailKind API Rules

51 rules · 49 error-severity 1 warn-severity 1 info-severity

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

BatchRequest

3 properties

JSON SCHEMA

SignupConfirmRequest

2 properties

JSON SCHEMA

SignupConfirmResponse

8 properties

JSON SCHEMA

SignupRequest

2 properties

JSON SCHEMA

SignupResponse

6 properties

JSON SCHEMA

SuccessResponse

11 properties

JSON SCHEMA

Security Posture 2

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

EmailKind Authentication

1 scheme

SECURITY

EmailKind Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

EmailKind Agentic Access

4 operations · 3 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Login

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

llms.txt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: emailkind-com
name: EmailKind
description: EmailKind provides a single API endpoint that identifies the exact email service provider behind any email address,
  covering Google Workspace, Microsoft 365, Zoho and over 150 other providers. It also distinguishes business versus personal
  accounts, detects disposable addresses, and enriches the data with company information, all in one call.
url: https://artifacts.apis.io/emailkind-com/apis.yml
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: '2026-11-13'
  method: derived
image: https://emailkind.com/static/img/og-image.png
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-06 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-06'
modified: '2026-11-06'
tags:
- Email
- Email Verification
- Data Enrichment
- Software-as-a-Service
tags_raw:
- Email
- API
- EmailVerification
- Enrichment
- SaaS
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/emailkind-com-agentic-access.yml
- type: Plans
  url: plans/emailkind-com-plans-pricing.yml
- type: Spectral
  url: rules/emailkind-com-rules.yml
- type: JSONLD
  url: json-ld/emailkind-com-context.jsonld
- type: Vocabulary
  url: vocabulary/emailkind-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/emailkind-com-data-model.yml
- type: Authentication
  url: authentication/emailkind-com-authentication.yml
- type: ErrorCatalog
  url: errors/emailkind-com-problem-types.yml
- type: Conformance
  url: conformance/emailkind-com-conformance.yml
- type: LLMsTxt
  url: llms/emailkind-com-llms.txt
- type: MCPServer
  url: mcp/emailkind-com-mcp.yml
- type: Hosts
  url: hosts/emailkind-com-hosts.yml
- type: Vendors
  url: vendors/emailkind-com-vendors.yml
- type: TermsOfService
  url: https://emailkind.com/terms
- type: PrivacyPolicy
  url: https://emailkind.com/privacy
- type: Pricing
  url: https://emailkind.com/pricing
- type: Login
  url: https://emailkind.com/login
- type: GettingStarted
  url: https://emailkind.com/docs/getting-started
- type: DomainSecurity
  url: security/emailkind-com-domain-security.yml
- type: Website
  url: https://emailkind.com/
- type: Documentation
  url: https://emailkind.com/docs
- type: APIReference
  url: https://emailkind.com/openapi.json
- type: llms.txt
  url: https://emailkind.com/llms.txt
apis:
- aid: emailkind-com:emailkind-com-classify-api
  name: EmailKind Classify API
  description: The Classify API from EmailKind — 2 operation(s) for classify.
  humanURL: https://emailkind.com/docs
  baseURL: https://emailkind.com/v1
  tags:
  - Classify
  properties:
  - type: OpenAPI
    url: openapi/emailkind-com-classify-api-openapi.yml
  - type: JSONSchema
    url: json-schema/emailkind-com-success-response-schema.json
  - type: JSONSchema
    url: json-schema/emailkind-com-batch-request-schema.json
- aid: emailkind-com:emailkind-com-signup-api
  name: EmailKind Signup API
  description: The Signup API from EmailKind — 2 operation(s) for signup.
  humanURL: https://emailkind.com/docs
  baseURL: https://emailkind.com/v1
  tags:
  - Sign Up
  tags_raw:
  - Signup
  properties:
  - type: OpenAPI
    url: openapi/emailkind-com-signup-api-openapi.yml
  - type: JSONSchema
    url: json-schema/emailkind-com-signup-confirm-response-schema.json
  - type: JSONSchema
    url: json-schema/emailkind-com-signup-response-schema.json
  - type: JSONSchema
    url: json-schema/emailkind-com-signup-request-schema.json
  - type: JSONSchema
    url: json-schema/emailkind-com-signup-confirm-request-schema.json
x-enrichment:
  date: '2026-11-06'
  status: enriched
  artifacts_added: 22
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

EmailKind API — frequently asked questions

Does EmailKind have an API?

Yes. APIs.io lists 2 APIs from EmailKind, including EmailKind Classify API and EmailKind Signup API.

Is there an OpenAPI specification for the EmailKind API?

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

How do I authenticate with the EmailKind API?

EmailKind uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as EmailKind Authentication.

How much does the EmailKind API cost?

EmailKind publishes its prices; its Free plan is $0/month as of 2026-11-06. APIs.io lists 5 pricing plans for EmailKind, with each plan's price, limits and inclusions under Pricing on this page.

Does EmailKind have an MCP server?

Yes. APIs.io lists 1 MCP server for EmailKind: Remote MCP server at emailkind.com requiring an API key.

Is the EmailKind API ready for AI agents?

EmailKind has a Kin Score of 46.0 out of 100 (developing) and an Agent Readiness score of 31.4 (agent-ready), scored by API Evangelist on 2026-11-13.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/emailkind-com"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/emailkind-com/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/emailkind-com/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.