EmailOctopus website screenshot

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
61.1/100 strong ▬ flat Agent 33/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
AccessFreemiumSelf serve⚡ Free to try
2 APIs
EmailEmail MarketingNewslettersCampaignsAutomationContactsListMarketingWebhookTransactional EmailSubscriber ManagementReporting

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 61.1/100 · strong
Contract Quality 12.2 / 19
Developer Ergonomics 7.6 / 15
Access Clarity 12.6 / 15
Operational Transparency 5.4 / 10
Contract Governance 0.4 / 9
Discoverability 5.1 / 8
Regulatory Posture 5.2 / 15
Create-or-Update Ergonomics 3.3 / 10
Agent readiness — 33/100 · 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
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
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/.
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 github.com/api-evangelist/emailoctopus: open an issue to ask a question, or submit a pull request to add artifacts. 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.

EmailOctopus Automation API

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 da...

EmailOctopus Campaign API

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...

EmailOctopus Contact API

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}/contact...

EmailOctopus Field API

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...

EmailOctopus List API

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....

EmailOctopus Tag API

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.

Open Collections 8

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

EmailOctopus v2 Automation API

OPEN COLLECTION

EmailOctopus v2 Automation Campaign API

OPEN COLLECTION

EmailOctopus v2 Automation Contact API

OPEN COLLECTION

EmailOctopus v2 Automation Field API

OPEN COLLECTION

EmailOctopus v2 Automation List API

OPEN COLLECTION

EmailOctopus v2 Automation Tag API

OPEN COLLECTION

EmailOctopus v2 API

OPEN COLLECTION

Scroll for all 8

Pricing Plans 1

Published pricing tiers and plan structures.

Emailoctopus Plans Pricing

3 plans

PLANS

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.

Emailoctopus Finops

FINOPS

Event Specifications 1

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

Emailoctopus Webhooks

ASYNCAPI

Security Posture 2

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

Emailoctopus Authentication

http · 1 scheme

SECURITY

Emailoctopus Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Emailoctopus Agentic Access

25 operations · 15 acting

25 operations · 15 acting

AGENTIC

Resources

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
Conventions
 ErrorCatalog
ErrorCatalog
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
Lifecycle
 Webhooks
Webhooks
 Components
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
Plans
 FinOps
FinOps
 Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
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.
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
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-09-03'
  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

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