EmailOctopus

EmailOctopus is an affordable email-marketing platform for newsletters, campaigns, automations and audience management, built on a low-cost sending model that undercuts the incumbent ESPs. Its v2 REST API is served from a single host, https://api.emailoctopus.com, with no version segment in the path, and is authenticated with a Bearer API key. The API covers subscriber lists, contacts, per-list custom fields and tags, campaigns and three campaign report projections, plus an operation to enqueue a contact into an automation. EmailOctopus publishes a real OpenAPI 3.1.0 document (25 operations, 19 schemas) at its v2 reference URL, documents an RFC 7807 error envelope with dereferenceable type URIs, cursor pagination, a token-bucket rate limit of 10 requests per second with a burst of 100, and an HMAC-SHA256-signed webhook surface carrying eight contact event types. It ships no official client SDK, no CLI and no MCP server.

EmailOctopus publishes 6 APIs on the APIs.io network, including Automation API, Campaign API, Contact API, and 3 more. Tagged areas include Email, Email Marketing, Newsletters, Campaigns, and Automation.

The EmailOctopus catalog on APIs.io includes 1 event-driven AsyncAPI specification.

EmailOctopus’ developer surface includes authentication, documentation, API reference, getting-started guide, support, engineering blog, pricing, and 22 more developer resources.

🌐 Visit website 📡 Source on GitHub

61.7/100 strong ▬ flat Agent 45/100 agent ready Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

AccessFreemiumSelf serve⚡ Free to try

6 APIs

EmailEmail MarketingNewslettersCampaignsAutomationContactsListMarketingWebhookTransactional EmailSubscriber ManagementReporting

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 61.7/100 · strong

Contract Quality 14.3 / 21

Developer Ergonomics 8.4 / 17

Access Clarity 14.3 / 17

Operational Transparency 6.1 / 11

Contract Governance 1.7 / 10

Discoverability 6.9 / 9

Regulatory Posture 5.2 / 15

Agent readiness — 45/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 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 0 / 4

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.

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/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/emailoctopus: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 6

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

Rate Limits 1

Documented rate limits and quota policies.

Emailoctopus Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

OpenAPI

OpenAPI

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

DataModel

Conformance

Lifecycle

Webhooks

Components

Scroll for all 7

Build 1

SDKs, sample code, and the tooling you integrate with

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

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

Plans

FinOps

Pricing

TermsOfService

PrivacyPolicy

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: emailoctopus
url: https://raw.githubusercontent.com/api-evangelist/emailoctopus/refs/heads/main/apis.yml
name: EmailOctopus
kind: company
description: EmailOctopus is an affordable email-marketing platform for newsletters, campaigns, automations and audience management,
  built on a low-cost sending model that undercuts the incumbent ESPs. Its v2 REST API is served from a single host, https://api.emailoctopus.com,
  with no version segment in the path, and is authenticated with a Bearer API key. The API covers subscriber lists, contacts,
  per-list custom fields and tags, campaigns and three campaign report projections, plus an operation to enqueue a contact
  into an automation. EmailOctopus publishes a real OpenAPI 3.1.0 document (25 operations, 19 schemas) at its v2 reference
  URL, documents an RFC 7807 error envelope with dereferenceable type URIs, cursor pagination, a token-bucket rate limit of
  10 requests per second with a burst of 100, and an HMAC-SHA256-signed webhook surface carrying eight contact event types.
  It ships no official client SDK, no CLI and no MCP server.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/emailoctopus.png
tags:
- Email
- Email Marketing
- Newsletters
- Campaigns
- Automation
- Contacts
- List
- Marketing
- Webhook
- Transactional Email
- Subscriber Management
- Reporting
tags_raw:
- Email
- Email Marketing
- Newsletters
- Campaigns
- Automation
- Contacts
- Lists
- Marketing
- Webhooks
- Transactional Email
- Subscriber Management
- Reporting
created: '2026-06-25'
modified: '2026-08-13'
specificationVersion: '0.23'
apis:
- aid: emailoctopus:emailoctopus-automation-api
  name: EmailOctopus Automation API
  description: Enqueue an existing contact into an EmailOctopus automation. Write-only — the v2 API exposes no operation to
    list or read automations, so the automation id must come from the dashboard. 1 operation(s) in the EmailOctopus v2 OpenAPI
    3.1.0.
  humanURL: https://emailoctopus.com/api-documentation/v2
  baseURL: https://api.emailoctopus.com
  tags:
  - Automation
  - Email Marketing
  properties:
  - type: OpenAPI
    url: openapi/emailoctopus-automation-api-openapi.yml
  - type: Overlay
    url: overlays/emailoctopus-automation-overlay.yaml
  - type: Documentation
    url: https://emailoctopus.com/api-documentation/v2
  - type: APIReference
    url: https://emailoctopus.com/api-documentation/v2
  - type: PostmanCollection
    url: collections/emailoctopus-automation-api.postman_collection.json
  - type: OpenCollection
    url: collections/emailoctopus-automation-api.opencollection.json
- aid: emailoctopus:emailoctopus-campaign-api
  name: EmailOctopus Campaign API
  description: 'Read campaigns and their three report projections — summary counters, per-link clicks, and per-contact engagement
    rows. Read-only: campaigns cannot be created, scheduled or sent through the v2 API. 5 operation(s) in the EmailOctopus
    v2 OpenAPI 3.1.0.'
  humanURL: https://emailoctopus.com/api-documentation/v2
  baseURL: https://api.emailoctopus.com
  tags:
  - Campaign
  - Email Marketing
  properties:
  - type: OpenAPI
    url: openapi/emailoctopus-campaign-api-openapi.yml
  - type: Overlay
    url: overlays/emailoctopus-campaign-overlay.yaml
  - type: Documentation
    url: https://emailoctopus.com/api-documentation/v2
  - type: APIReference
    url: https://emailoctopus.com/api-documentation/v2
  - type: PostmanCollection
    url: collections/emailoctopus-campaign-api.postman_collection.json
  - type: OpenCollection
    url: collections/emailoctopus-campaign-api.opencollection.json
- aid: emailoctopus:emailoctopus-contact-api
  name: EmailOctopus Contact API
  description: 'Manage subscribers on a list: create, read, update, delete, upsert by email address, and update many at once
    through the batch endpoint. The upsert (PUT /lists/{list_id}/contacts) is the safe-retry path, since the API publishes
    no idempotency key. 7 operation(s) in the EmailOctopus v2 OpenAPI 3.1.0.'
  humanURL: https://emailoctopus.com/api-documentation/v2
  baseURL: https://api.emailoctopus.com
  tags:
  - Contact
  - Email Marketing
  properties:
  - type: OpenAPI
    url: openapi/emailoctopus-contact-api-openapi.yml
  - type: Overlay
    url: overlays/emailoctopus-contact-overlay.yaml
  - type: Documentation
    url: https://emailoctopus.com/api-documentation/v2
  - type: APIReference
    url: https://emailoctopus.com/api-documentation/v2
  - type: PostmanCollection
    url: collections/emailoctopus-contact-api.postman_collection.json
  - type: OpenCollection
    url: collections/emailoctopus-contact-api.opencollection.json
- aid: emailoctopus:emailoctopus-field-api
  name: EmailOctopus Field API
  description: Define the per-list custom fields contact records are written against. Fields are keyed by a stable tag slug
    and typed text, number or date, with optional choices and a fallback value. 3 operation(s) in the EmailOctopus v2 OpenAPI
    3.1.0.
  humanURL: https://emailoctopus.com/api-documentation/v2
  baseURL: https://api.emailoctopus.com
  tags:
  - Field
  - Email Marketing
  properties:
  - type: OpenAPI
    url: openapi/emailoctopus-field-api-openapi.yml
  - type: Overlay
    url: overlays/emailoctopus-field-overlay.yaml
  - type: Documentation
    url: https://emailoctopus.com/api-documentation/v2
  - type: APIReference
    url: https://emailoctopus.com/api-documentation/v2
  - type: PostmanCollection
    url: collections/emailoctopus-field-api.postman_collection.json
  - type: OpenCollection
    url: collections/emailoctopus-field-api.opencollection.json
- aid: emailoctopus:emailoctopus-list-api
  name: EmailOctopus List API
  description: Create and manage subscriber lists, the aggregate root of the EmailOctopus data model. Fields, tags and contacts
    are all owned by a list and addressed through list-scoped paths. 5 operation(s) in the EmailOctopus v2 OpenAPI 3.1.0.
  humanURL: https://emailoctopus.com/api-documentation/v2
  baseURL: https://api.emailoctopus.com
  tags:
  - List
  - Email Marketing
  properties:
  - type: OpenAPI
    url: openapi/emailoctopus-list-api-openapi.yml
  - type: Overlay
    url: overlays/emailoctopus-list-overlay.yaml
  - type: Documentation
    url: https://emailoctopus.com/api-documentation/v2
  - type: APIReference
    url: https://emailoctopus.com/api-documentation/v2
  - type: PostmanCollection
    url: collections/emailoctopus-list-api.postman_collection.json
  - type: OpenCollection
    url: collections/emailoctopus-list-api.opencollection.json
- aid: emailoctopus:emailoctopus-tag-api
  name: EmailOctopus Tag API
  description: Create, rename, delete and list the tags used to segment contacts on a list. Tags are keyed by slug rather
    than an id. 4 operation(s) in the EmailOctopus v2 OpenAPI 3.1.0.
  humanURL: https://emailoctopus.com/api-documentation/v2
  baseURL: https://api.emailoctopus.com
  tags:
  - Tag
  - Email Marketing
  properties:
  - type: OpenAPI
    url: openapi/emailoctopus-tag-api-openapi.yml
  - type: Overlay
    url: overlays/emailoctopus-tag-overlay.yaml
  - type: Documentation
    url: https://emailoctopus.com/api-documentation/v2
  - type: APIReference
    url: https://emailoctopus.com/api-documentation/v2
  - type: PostmanCollection
    url: collections/emailoctopus-tag-api.postman_collection.json
  - type: OpenCollection
    url: collections/emailoctopus-tag-api.opencollection.json
common:
- type: AgenticAccess
  url: agentic-access/emailoctopus-agentic-access.yml
- type: DomainSecurity
  url: security/emailoctopus-domain-security.yml
- type: Authentication
  url: authentication/emailoctopus-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/emailoctopus
- type: Website
  url: https://emailoctopus.com
- type: Documentation
  url: https://emailoctopus.com/api-documentation/v2
- type: Plans
  url: plans/emailoctopus-plans-pricing.yml
- type: RateLimits
  url: rate-limits/emailoctopus-rate-limits.yml
- type: FinOps
  url: finops/emailoctopus-finops.yml
- type: OpenAPI
  url: openapi/_original/emailoctopus-v2-openapi.json
- type: Packages
  url: packages/emailoctopus-packages.yml
- type: LLMsTxt
  url: llms/emailoctopus-llms.txt
- type: Conventions
  url: conventions/emailoctopus-conventions.yml
- type: ErrorCatalog
  url: errors/emailoctopus-problem-types.yml
- type: DataModel
  url: data-model/emailoctopus-data-model.yml
- type: Conformance
  url: conformance/emailoctopus-conformance.yml
- type: Lifecycle
  url: lifecycle/emailoctopus-lifecycle.yml
- type: StatusPage
  url: https://status.emailoctopus.com
- type: Webhooks
  url: asyncapi/emailoctopus-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Components
  url: components/emailoctopus-components.yml
- type: APIReference
  url: https://emailoctopus.com/api-documentation/v2
- type: GettingStarted
  url: https://emailoctopus.com/api-documentation/v2#section/Authentication
- type: Support
  url: https://help.emailoctopus.com
- type: Blog
  url: https://emailoctopus.com/blog
- type: Pricing
  url: https://emailoctopus.com/pricing
- type: SignUp
  url: https://emailoctopus.com/account/sign-up
- type: TermsOfService
  url: https://emailoctopus.com/legal/terms
- type: PrivacyPolicy
  url: https://emailoctopus.com/legal/privacy
- type: Integrations
  url: https://emailoctopus.com/integrations
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 24
  pass: local-v1