MailOptin

aid: mailoptin
name: MailOptin
description: 'MailOptin is a WordPress lead-generation and email-automation plugin that converts website visitors into subscribers
  with popups, slide-ins, notification bars and inline optin forms, then sends one-off newsletters and event-triggered automated
  emails. It connects WordPress to more than sixty email marketing platforms, CRMs, form plugins, e-commerce and membership
  systems — Mailchimp, ActiveCampaign, HubSpot, AWeber, Klaviyo, Brevo, Salesforce, WooCommerce and others — and can post
  optin submissions to an arbitrary endpoint through a generic webhook connection. MailOptin is self-hosted software rather
  than a hosted service: it publishes no product API, no OpenAPI and no client SDK, and all functionality runs inside the
  customer''s own WordPress installation. Its own website, mailoptin.io, runs WordPress and does serve a public self-describing
  REST API together with an OAuth-protected Model Context Protocol server.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-09-02'
  method: derived
image: https://mailoptin.io/wp-content/uploads/2014/05/mailoptin-plugin-banner.png
url: https://raw.githubusercontent.com/api-evangelist/mailoptin/refs/heads/main/apis.yml
x-type: company
x-source: harvest:marketing-integration-graph
specificationVersion: '0.23'
created: '2026-08-12'
modified: '2026-08-12'
tags:
- Company
- Email Marketing
- Marketing Automation
- Lead Generation
- WordPress
- Newsletters
- Webhook
- MCP
- Plugins
tags_raw:
- Company
- Email Marketing
- Marketing Automation
- Lead Generation
- WordPress
- Newsletters
- Webhooks
- Model Context Protocol
- Plugins
apis:
- aid: mailoptin-site
  name: MailOptin Site REST API and MCP Server
  description: The WordPress REST API served by mailoptin.io, plus the Model Context Protocol server exposed through the WordPress
    MCP Adapter at the mcp namespace. The REST root is a public, self-describing route index — 35 namespaces and 771 routes,
    each with its argument schema — and content routes under wp/v2 answer anonymously. The MCP endpoint is live but auth-gated,
    returning 401 mcp_unauthorized with a WWW-Authenticate Bearer challenge that links to RFC 9728 protected-resource metadata.
    This is the company website's own surface, not a product API for the MailOptin lead-generation service, which ships as
    a self-hosted WordPress plugin.
  humanURL: https://mailoptin.io/
  baseURL: https://mailoptin.io/wp-json
  tags:
  - WordPress
  - MCP
  - Authentication
  tags_raw:
  - WordPress
  - Model Context Protocol
  - OAuth
  properties:
  - type: MCPServer
    url: mcp/mailoptin-mcp.yml
  - type: Authentication
    url: authentication/mailoptin-authentication.yml
  - type: OAuthScopes
    url: scopes/mailoptin-scopes.yml
  - type: ErrorCatalog
    url: errors/mailoptin-problem-types.yml
  - type: Conventions
    url: conventions/mailoptin-conventions.yml
  - type: RateLimits
    url: rate-limits/mailoptin-rate-limits.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://mailoptin.io/
- type: Documentation
  url: https://mailoptin.io/docs/
- type: GettingStarted
  url: https://mailoptin.io/section/getting-started/
- type: Support
  url: https://mailoptin.io/support/
- type: Blog
  url: https://mailoptin.io/blog/
- type: BlogRSS
  url: https://mailoptin.io/blog/feed/
- type: GitHubOrganization
  url: https://github.com/mailoptin
- type: Pricing
  url: https://mailoptin.io/pricing/
- type: SignUp
  url: https://my.mailoptin.io/login/
- type: TermsOfService
  url: https://mailoptin.io/terms-conditions/
- type: PrivacyPolicy
  url: https://mailoptin.io/privacy-policy/
- type: ChangeLog
  url: changelog/mailoptin-changelog.yml
- type: Lifecycle
  url: lifecycle/mailoptin-lifecycle.yml
- type: Plans
  url: plans/mailoptin-plans-pricing.yml
- type: RateLimits
  url: rate-limits/mailoptin-rate-limits.yml
- type: Packages
  url: packages/mailoptin-packages.yml
- type: Webhooks
  url: asyncapi/mailoptin-webhooks.yml
- type: Conformance
  url: conformance/mailoptin-conformance.yml
- type: Conventions
  url: conventions/mailoptin-conventions.yml
- type: ErrorCatalog
  url: errors/mailoptin-problem-types.yml
- type: Authentication
  url: authentication/mailoptin-authentication.yml
- type: OAuthScopes
  url: scopes/mailoptin-scopes.yml
- type: MCPServer
  url: mcp/mailoptin-mcp.yml
- type: WellKnown
  url: well-known/mailoptin-well-known.yml
- type: LLMsTxt
  url: llms/mailoptin-llms.txt
- type: DomainSecurity
  url: security/mailoptin-domain-security.yml
x-enrichment:
  date: '2026-08-12'
  status: enriched
  artifacts_added: 17
  pass: local-v1
x-coverage:
  state: covered
  reason: covered
  detail: MailOptin ships no product API, but mailoptin.io serves real machine-readable documents — RFC 8414 authorization-server
    metadata, RFC 9728 protected-resource metadata, a live OAuth-gated MCP server and a public 771-route WordPress REST index
    — all of which were fetched and recorded.
  evidence:
  - url: https://mailoptin.io/.well-known/oauth-protected-resource
    status: 200
  - url: https://mailoptin.io/wp-json/mcp/mcp-oauth-server
    status: 401
  checked: '2026-08-12'
x-vouched-by:
- Drip
- MailerLite
- SendPulse
x-vouch-count: 3