mailcheer-com

Mailcheer provides free newsletter software with a robust API and MCP server, enabling developers and marketers to create, manage, and send AI‑enhanced newsletters. The platform offers campaign editors, templates, deliverability analytics, subscriber segmentation, and integrations for e‑commerce, real‑estate, and SaaS businesses. With AI writing assistance and a comprehensive developer portal, Mailcheer supports automated newsletter workflows and custom applications via its RESTful API.

mailcheer-com publishes 6 API contracts indexed on the APIs.io network, including Campaigns API, Emails API, Subscribers API, and 3 more. Tagged areas include Company, Newsletter, API, Marketing, and AI.

The mailcheer-com catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

mailcheer-com’s developer surface includes authentication, changelog, API reference, documentation, pricing, signup flow, support, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

55.6/100 strong Agent 60/100 agent native Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 3 Agent Skills

CompanyNewsletterAPIMarketingAI

Kin Score

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

Composite quality — 55.6/100 · strong

Contract Quality 15.7 / 21

Developer Ergonomics 6.0 / 17

Access Clarity 13.0 / 17

Operational Transparency 3.8 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.4 / 15

Agent readiness — 60/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 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 6 / 6

Agent Skills 5 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 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/.

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/mailcheer-com/"><img src="https://apis.io/badge/mailcheer-com/card.svg" alt="mailcheer-com 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Pagination +5 pts — share of collection GETs (an array, or one wrapped in data/items/results ...) that declare a page/limit/offset/cursor parameter, a Link header or a next/cursor field; na with no collection GETs
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's
Well-Known Catalog +4 pts — common[].type includes WellKnown, APICatalog, or api-catalog

1 more unmet check in the Agent Readiness table above.

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

Developer Ergonomics scores 35.1 — up to +13.0 composite points
Contract Governance scores 22.0 — up to +9.4 composite points
Operational Transparency scores 34.2 — up to +8.6 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/mailcheer-com/apis.yml: open an issue on github.com/api-evangelist/mailcheer-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 6

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

mailcheer-com Campaigns API

Drafts, sending and statistics.

mailcheer-com Emails API

Individual sends and their status.

mailcheer-com Subscribers API

The people signed up to your lists.

mailcheer-com Suppression API

Addresses that will receive nothing further.

mailcheer-com Webhooks API

Mailcheer calls YOUR service when something happens.

mailcheer-com Workspace API

Who the key belongs to.

Agent Skills 3

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

mailcheer-com-create-and-send-campaign

AGENT SKILL

mailcheer-com-create-test-webhook

AGENT SKILL

mailcheer-com-upsert-and-tag-subscriber

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Mailcheer Com Plans Pricing

4 plans

PLANS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Mailcheer Com Webhooks

ASYNCAPI

Semantic Vocabularies 1

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

Mailcheer Com Context

29 classes · 109 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

mailcheer-com API Rules

17 rules · 13 errors 3 warnings 1 info

SPECTRAL

JSON Schema 6

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

Account

10 properties

JSON SCHEMA

CampaignRequest

8 properties

JSON SCHEMA

CampaignStats

8 properties

JSON SCHEMA

CampaignUpdate

8 properties

JSON SCHEMA

EmailDetail

0 properties

JSON SCHEMA

EmailRequest

16 properties

JSON SCHEMA

Security Posture 2

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

Mailcheer Com Authentication

1 scheme

SECURITY

Mailcheer Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Mailcheer Com Agentic Access

37 operations · 22 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 9

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Webhooks

DataModel

Idempotency

Conventions

ErrorCatalog

Conformance

Scroll for all 9

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

Security

Security

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

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: mailcheer-com
name: mailcheer-com
image: https://mailcheer.com/og-en.png
description: Mailcheer provides free newsletter software with a robust API and MCP server, enabling developers and marketers
  to create, manage, and send AI‑enhanced newsletters. The platform offers campaign editors, templates, deliverability analytics,
  subscriber segmentation, and integrations for e‑commerce, real‑estate, and SaaS businesses. With AI writing assistance and
  a comprehensive developer portal, Mailcheer supports automated newsletter workflows and custom applications via its RESTful
  API.
url: https://artifacts.apis.io/mailcheer-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-30'
modified: '2026-10-30'
tags:
- Company
- Newsletter
- API
- Marketing
- AI
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/mailcheer-com-agentic-access.yml
- type: Plans
  url: plans/mailcheer-com-plans-pricing.yml
- type: Spectral
  url: rules/mailcheer-com-rules.yml
- type: JSONLD
  url: json-ld/mailcheer-com-context.jsonld
- type: Vocabulary
  url: vocabulary/mailcheer-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/mailcheer-com-webhooks.yml
- type: DataModel
  url: data-model/mailcheer-com-data-model.yml
- type: Idempotency
  url: conventions/mailcheer-com-conventions.yml
- type: Conventions
  url: conventions/mailcheer-com-conventions.yml
- type: Authentication
  url: authentication/mailcheer-com-authentication.yml
- type: ErrorCatalog
  url: errors/mailcheer-com-problem-types.yml
- type: Conformance
  url: conformance/mailcheer-com-conformance.yml
- type: LLMsTxt
  url: llms/mailcheer-com-llms.txt
- type: WellKnown
  url: well-known/mailcheer-com-well-known.yml
- type: Hosts
  url: hosts/mailcheer-com-hosts.yml
- type: Vendors
  url: vendors/mailcheer-com-vendors.yml
- type: Security
  url: https://mailcheer.com/security
- type: ChangeLog
  url: https://mailcheer.com/changelog
- type: APIReference
  url: https://mailcheer.com/docs/api
- type: DomainSecurity
  url: security/mailcheer-com-domain-security.yml
- type: Website
  url: https://mailcheer.com/
- type: Documentation
  url: https://mailcheer.com/docs
- type: Pricing
  url: https://mailcheer.com/pricing
- type: SignUp
  url: https://mailcheer.com/signup
- type: Support
  url: https://mailcheer.com/status
- type: TermsOfService
  url: https://mailcheer.com/terms
- type: PrivacyPolicy
  url: https://mailcheer.com/privacy
apis:
- aid: mailcheer-com:mailcheer-com-campaigns-api
  name: mailcheer-com Campaigns API
  description: Drafts, sending and statistics.
  humanURL: https://mailcheer.com/docs/api
  baseURL: https://mailcheer.com
  tags:
  - Campaigns
  properties:
  - type: OpenAPI
    url: openapi/mailcheer-com-campaigns-api-openapi.yml
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-account-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-stats-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-detail-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-update-schema.json
- aid: mailcheer-com:mailcheer-com-emails-api
  name: mailcheer-com Emails API
  description: Individual sends and their status.
  humanURL: https://mailcheer.com/docs/api
  baseURL: https://mailcheer.com
  tags:
  - Emails
  properties:
  - type: OpenAPI
    url: openapi/mailcheer-com-emails-api-openapi.yml
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-account-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-stats-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-detail-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-update-schema.json
- aid: mailcheer-com:mailcheer-com-subscribers-api
  name: mailcheer-com Subscribers API
  description: The people signed up to your lists.
  humanURL: https://mailcheer.com/docs/api
  baseURL: https://mailcheer.com
  tags:
  - Subscribers
  properties:
  - type: OpenAPI
    url: openapi/mailcheer-com-subscribers-api-openapi.yml
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-account-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-stats-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-detail-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-update-schema.json
- aid: mailcheer-com:mailcheer-com-suppression-api
  name: mailcheer-com Suppression API
  description: Addresses that will receive nothing further.
  humanURL: https://mailcheer.com/docs/api
  baseURL: https://mailcheer.com
  tags:
  - Suppression
  properties:
  - type: OpenAPI
    url: openapi/mailcheer-com-suppression-api-openapi.yml
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-account-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-stats-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-detail-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-update-schema.json
- aid: mailcheer-com:mailcheer-com-webhooks-api
  name: mailcheer-com Webhooks API
  description: Mailcheer calls YOUR service when something happens.
  humanURL: https://mailcheer.com/docs/api
  baseURL: https://mailcheer.com
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/mailcheer-com-webhooks-api-openapi.yml
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-account-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-stats-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-detail-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-update-schema.json
- aid: mailcheer-com:mailcheer-com-workspace-api
  name: mailcheer-com Workspace API
  description: Who the key belongs to.
  humanURL: https://mailcheer.com/docs/api
  baseURL: https://mailcheer.com
  tags:
  - Workspace
  properties:
  - type: OpenAPI
    url: openapi/mailcheer-com-workspace-api-openapi.yml
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-account-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-stats-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-email-detail-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-request-schema.json
  - type: JSONSchema
    url: json-schema/mailcheer-com-campaign-update-schema.json
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 29
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

mailcheer-com API — frequently asked questions

Does mailcheer-com have an API?

Yes. APIs.io lists 6 APIs from mailcheer-com, including mailcheer-com Campaigns API, mailcheer-com Emails API and mailcheer-com Subscribers API, and 3 more.

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

Yes. APIs.io indexes 6 OpenAPI specifications for mailcheer-com, each linked for download from this page.

How do I authenticate with the mailcheer-com API?

mailcheer-com documents its authentication (1 scheme). The details are profiled on APIs.io as Mailcheer Com Authentication.

How much does the mailcheer-com API cost?

APIs.io lists 4 pricing plans for mailcheer-com, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the mailcheer-com API ready for AI agents?

mailcheer-com has a Kin Score of 55.6 out of 100 (strong) and an Agent Readiness score of 60.0 (agent-native), scored by API Evangelist on 2026-10-31.

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/mailcheer-com"

All providers

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

Every operation they expose

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

How their score was established

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

Discovery needs no key. Ratings and market analysis are Pro.

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.