MailerLite

MailerLite is an email marketing and automation platform used by creators, e-commerce sellers and small businesses to build lists, send campaigns and run behavioural automations. The current REST API at connect.mailerlite.com exposes subscribers, groups, segments, custom fields, campaigns, automations, forms, webhooks, batching, and a full e-commerce surface (shops, products, categories, customers, orders, carts) that drives abandoned-cart and post-purchase automations. Authentication is a bearer API key minted in the dashboard; responses are cursor-paginated and the API version can be pinned with an X-Version date header. Alongside the REST API, MailerLite ships six official SDKs, a first-party Go CLI with an interactive TUI, a published Agent Skill, and a hosted OAuth-protected MCP server at mcp.mailerlite.com exposing roughly 76 tools to AI assistants. A legacy Classic API v2 still serves older accounts.

MailerLite publishes 2 API contracts indexed on the APIs.io network, including Webhook API, and 1 more. Tagged areas include Email Marketing, Automation, Newsletters, Subscribers, and Campaigns.

The MailerLite catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

MailerLite’s developer surface includes authentication, developer portal, pricing, CLI, documentation, API reference, getting-started guide, and 46 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

71.2/100 exemplar ▬ flat Agent 55/100 agent ready Front door AI 5/6 prominent Heartbeat 100/100 alive 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 1 MCP Servers 1 Agent Skills

Email Marketing Automation Newsletters Subscribers Campaigns Webhook E-Commerce Segmentation Transactional Email MCP Email

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Customer Relationship Management

BC-420

SegmentsSubscribers

Marketing Management

BC-400

AutomationsCampaigns

Kin Score

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

Composite quality — 71.2/100 · exemplar

Contract Quality 10.1 / 19

Developer Ergonomics 13.2 / 15

Access Clarity 15.0 / 15

Operational Transparency 5.6 / 10

Contract Governance 2.7 / 9

Discoverability 5.6 / 8

Regulatory Posture 5.4 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 55/100 · 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 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 3 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 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 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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):

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
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's
Dry-Run / Simulate Mode +4 pts — OpenAPI: destructive operations expose a dry_run / simulate / preview / validate_only parameter

1 more unmet check in the Agent Readiness table above.

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

Contract Quality scores 53.6 — up to +11.6 composite points
Contract Governance scores 29.5 — up to +8.5 composite points
Operational Transparency scores 57.9 — up to +5.5 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/mailerlite/apis.yml: open an issue on github.com/api-evangelist/mailerlite 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Official SDKs on Package Registries	builds-on	38.5	-	1
Agent Skills (SKILL.md packages)	builds-on	38.5	-	1
MACH & Headless Commerce	builds-on	38.5	-	1
Wix App Market (third-party apps for Wix sites)	builds-on	38.5	-	1
Raycast Store Extensions (first-party publishers + community-wrapped products)	builds-on	38.5	-	1
Official SDKs on Packagist, pub.dev and Hex	builds-on	38.5	-	1
IFTTT Services (service publishers)	builds-on	38.5	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 6

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 (verified)

Agent Skills

measured — observed by APIs.io (published)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

MCP Servers 1

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

MailerLite MCP Server

MCP SERVER

Agent Skills 1

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

MailerLite

AGENT SKILL

MailerLite API pricing

Prices published by MailerLite, read 2026-10-28 from www.mailerlite.com/pricing.

Plan	Price
Free	0/month Includes: 250 subscribers, 2,500 monthly emails, 2 user seats, Knowledge base support
Comfort	starting $12/month Includes: 50 automations, 10 forms, 10 sites, 5 digital products, 3 user seats, HeyLite intelligence; 10× the
Power	starting $25/month Includes: Unlimited monthly emails, unlimited automations/forms/sites/digital products/user seats, Live chat &
Enterprise	Custom Includes: 200K+ subscribers, Custom sending volume, Priority support

Plan details, limits and sources →

Rate limits

Global API requests: 120 requests
Import creation: 5 requests

Rate-limit details →

Billed by: subscriber tier · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Mailerlite Plans Pricing

4 plans

PLANS

Mailerlite Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Mailerlite Rate Limits

2 limits

RATE LIMITS

Service Levels 1

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

MailerLite

SLA

FinOps 1

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

Mailerlite Finops

FINOPS

Event Specifications 1

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

MailerLite Webhooks

AsyncAPI 2.6 description of MailerLite's outbound webhook surface. MailerLite delivers event notifications by issuing HTTP POST requests with a JSON body to a callback URL the c...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

MailerLite — asyncapi rules

7 rules · 1 errors 6 warnings

SPECTRAL

ISO/IEC 27001:2022, PCI DSS, GDPR, EU-U.S. Data Privacy Framework, Swiss-U.S. Data Privacy Framework, UK Extension to the EU-U.S. Data Privacy Framework

SECURITY

Agentic Access 1

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

Mailerlite Agentic Access

21 operations · 10 acting

AGENTIC

Resources

Get Started 5

Portal, sign-up, and the first successful call

Portal

DeveloperPortal

GettingStarted

SignUp

Login

Documentation 3

Reference material describing how the API behaves

AsyncAPI

AsyncAPI

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 7

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

MCPServer

MCPServer

AgentSkill

AgentSkill

LLMsTxt

WellKnown

Scroll for all 7

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

DataModel

Lifecycle

Webhooks

Conformance

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

ToolCrosswalk

Packages

SDKs

CLI

Access & Security 6

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

TrustCenter

TrustCenter

Compliance

Compliance

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

StatusPage

StatusPage

Support

Support

Commercial 5

Pricing, plans, and the legal terms of use

Pricing

Plans

FinOps

TermsOfService

PrivacyPolicy

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 10

Properties that don't map to a standard resource type

CapabilityMap

ContentSignal

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Scroll for all 10

Source (apis.yml)

aid: mailerlite
url: https://raw.githubusercontent.com/api-evangelist/mailerlite/refs/heads/main/apis.yml
name: MailerLite
kind: company
description: MailerLite is an email marketing and automation platform used by creators, e-commerce sellers and small businesses
  to build lists, send campaigns and run behavioural automations. The current REST API at connect.mailerlite.com exposes subscribers,
  groups, segments, custom fields, campaigns, automations, forms, webhooks, batching, and a full e-commerce surface (shops,
  products, categories, customers, orders, carts) that drives abandoned-cart and post-purchase automations. Authentication
  is a bearer API key minted in the dashboard; responses are cursor-paginated and the API version can be pinned with an X-Version
  date header. Alongside the REST API, MailerLite ships six official SDKs, a first-party Go CLI with an interactive TUI, a
  published Agent Skill, and a hosted OAuth-protected MCP server at mcp.mailerlite.com exposing roughly 76 tools to AI assistants.
  A legacy Classic API v2 still serves older accounts.
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: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/mailerlite.png
tags:
- Email Marketing
- Automation
- Newsletters
- Subscribers
- Campaigns
- Webhook
- E-Commerce
- Segmentation
- Transactional Email
- MCP
- Email
tags_raw:
- Email Marketing
- Automation
- Newsletters
- Subscribers
- Campaigns
- Webhooks
- E-commerce
- Segmentation
- Transactional Email
- MCP
- Email
created: '2026-05-08'
modified: '2026-08-13'
specificationVersion: '0.23'
apis:
- aid: mailerlite:mailerlite-classic-api
  name: MailerLite Classic API (Legacy)
  humanURL: https://developers-classic.mailerlite.com/
  baseURL: https://api.mailerlite.com/api/v2
  tags:
  - Email Marketing
  - Legacy
  - Deprecated
  description: 'The MailerLite Classic API serves legacy MailerLite Classic accounts. New integrations should target the current
    API at connect.mailerlite.com. Corrected 2026-08-13: the Classic documentation host is developers-classic.mailerlite.com
    (per the Classic API link in the current developer portal nav); the previously recorded classic.developers.mailerlite.com
    does not resolve.'
  properties:
  - type: Documentation
    url: https://developers-classic.mailerlite.com/
- aid: mailerlite:mailerlite-webhook-api
  name: MailerLite Webhook API
  description: The webhook API from MailerLite — 3 operation(s) for webhook.
  humanURL: https://developers-classic.mailerlite.com/
  baseURL: https://api.mailerlite.com/api/v2
  tags:
  - Webhook
  tags_raw:
  - webhook
  properties:
  - type: OpenAPI
    url: openapi/mailerlite-webhook-api-openapi.yml
  - type: Documentation
    url: https://developers.mailerlite.com/docs/
  - type: Authentication
    url: https://developers.mailerlite.com/docs/#authentication
  - type: AsyncAPI
    url: asyncapi/mailerlite-webhooks-asyncapi.yml
  - type: SDKs
    url: https://github.com/mailerlite/mailerlite-php
  - type: SDKs
    url: https://github.com/mailerlite/mailerlite-nodejs
  - type: SDKs
    url: https://github.com/mailerlite/mailerlite-python
  - type: SDKs
    url: https://github.com/mailerlite/mailerlite-go
  - type: SDKs
    url: https://github.com/mailerlite/mailerlite-ruby
common:
- type: CapabilityMap
  url: capabilities/mailerlite-capability-edges.yml
  name: MailerLite Business Capability Map
- type: AgenticAccess
  url: agentic-access/mailerlite-agentic-access.yml
- type: DomainSecurity
  url: security/mailerlite-domain-security.yml
- type: Authentication
  url: authentication/mailerlite-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/mailerlite-international
- type: Website
  url: https://www.mailerlite.com/
- type: Portal
  url: https://developers.mailerlite.com/
- type: GitHubOrganization
  url: https://github.com/mailerlite
- type: Pricing
  url: https://www.mailerlite.com/pricing
- type: Plans
  url: plans/mailerlite-plans-pricing.yml
- type: RateLimits
  url: rate-limits/mailerlite-rate-limits.yml
- type: FinOps
  url: finops/mailerlite-finops.yml
- type: Integrations
  url: https://www.mailerlite.com/integrations
- name: MailerLite MCP Server
  type: MCPServer
  url: https://mcp.mailerlite.com/mcp
- name: MCP Server Manifest
  type: MCPServer
  url: mcp/mailerlite-mcp.yml
- name: MCP to REST Tool Crosswalk
  type: ToolCrosswalk
  url: mcp/mailerlite-tool-crosswalk.yml
- name: Agent Skills (published by MailerLite)
  type: AgentSkill
  url: https://github.com/mailerlite/mailerlite-skills
- name: Agent Skills Index
  type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/mailerlite-llms.txt
- type: Packages
  url: packages/mailerlite-packages.yml
- type: SDKs
  url: packages/mailerlite-packages.yml
- type: CLI
  url: cli/mailerlite-cli.yml
- type: Conventions
  url: conventions/mailerlite-conventions.yml
- type: ErrorCatalog
  url: errors/mailerlite-problem-types.yml
- type: DataModel
  url: data-model/mailerlite-data-model.yml
- type: Lifecycle
  url: lifecycle/mailerlite-lifecycle.yml
- name: MailerLite Status
  type: StatusPage
  url: https://status.mailerlite.com/
- type: AsyncAPI
  url: asyncapi/mailerlite-webhooks-asyncapi.yml
- name: Webhooks
  type: Webhooks
  url: https://developers.mailerlite.com/api/webhooks
- type: WellKnown
  url: well-known/mailerlite-well-known.yml
- name: Content Signals Policy (robots.txt)
  type: ContentSignal
  url: https://www.mailerlite.com/robots.txt
- type: VulnerabilityDisclosure
  url: security/mailerlite-vulnerability-disclosure.yml
- name: Responsible Disclosure Program
  type: Security
  url: https://www.mailerlite.com/legal/responsible-disclosure-program
- type: TrustCenter
  url: security/mailerlite-trust-center.yml
- name: Security and Compliance
  type: Compliance
  url: https://www.mailerlite.com/trust-page
- type: Conformance
  url: conformance/mailerlite-conformance.yml
- name: Subscribers API Overlay
  type: Overlay
  url: overlays/mailerlite-subscribers-api-overlay.yaml
- name: Groups API Overlay
  type: Overlay
  url: overlays/mailerlite-groups-api-overlay.yaml
- name: Segments API Overlay
  type: Overlay
  url: overlays/mailerlite-segments-api-overlay.yaml
- name: Fields API Overlay
  type: Overlay
  url: overlays/mailerlite-fields-api-overlay.yaml
- name: Campaigns API Overlay
  type: Overlay
  url: overlays/mailerlite-campaigns-api-overlay.yaml
- name: Automations API Overlay
  type: Overlay
  url: overlays/mailerlite-automations-api-overlay.yaml
- name: Forms API Overlay
  type: Overlay
  url: overlays/mailerlite-forms-api-overlay.yaml
- name: Webhooks API Overlay
  type: Overlay
  url: overlays/mailerlite-webhooks-api-overlay.yaml
- type: DeveloperPortal
  url: https://developers.mailerlite.com/
- type: Documentation
  url: https://developers.mailerlite.com/
- type: APIReference
  url: https://developers.mailerlite.com/api/subscribers
- type: GettingStarted
  url: https://developers.mailerlite.com/getting-started
- type: Support
  url: https://www.mailerlite.com/help
- type: Blog
  url: https://www.mailerlite.com/blog
- type: SignUp
  url: https://www.mailerlite.com/signup
- type: Login
  url: https://dashboard.mailerlite.com/login
- type: TermsOfService
  url: https://www.mailerlite.com/legal/terms-of-service
- type: PrivacyPolicy
  url: https://www.mailerlite.com/legal/privacy-policy
integrations:
- name: Stripe
- name: Zapier
- name: Shopify
- name: WordPress
- name: WooCommerce
- name: Tidio All-in-one customer experience platform. Partner
- name: 500apps App Integration Software 3-rd party
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 25
  pass: local-v1

MailerLite API — frequently asked questions

Does MailerLite have an API?

Yes. APIs.io lists 2 APIs from MailerLite, including MailerLite Classic API (Legacy) and MailerLite Webhook API.

Is there an OpenAPI specification for the MailerLite API?

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

How do I authenticate with the MailerLite API?

MailerLite documents its authentication (http/oauth2 · 3 schemes). The details are profiled on APIs.io as Mailerlite Authentication.

How much does the MailerLite API cost?

MailerLite publishes its prices; its Free plan is 0/month as of 2026-10-28. APIs.io lists 4 pricing plans for MailerLite, with each plan's price, limits and inclusions under Pricing on this page.

Does MailerLite have an MCP server?

Yes. APIs.io lists 1 MCP server for MailerLite.

Is the MailerLite API ready for AI agents?

MailerLite has a Kin Score of 71.2 out of 100 (exemplar) and an Agent Readiness score of 55.3 (agent-ready), scored by API Evangelist on 2026-11-06.

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