Mailjet website screenshot

Mailjet

Mailjet is an email service provider offering a powerful REST API for sending transactional and marketing emails. It provides an easy-to-integrate API with support for PHP, Python, Ruby, Java, Node.js, C#, and Go, along with SMTP relay and real-time email tracking.

Mailjet publishes 8 API contracts indexed on the APIs.io network, including Campaigns API, Contact Lists API, Contacts API, and 5 more. Tagged areas include Email, Email Delivery, Marketing Email, SMTP, and Transactional Email.

Mailjet’s developer surface includes authentication, developer portal, signup flow, support, pricing, engineering blog, and 13 more developer resources.

🌐 Visit website📡 Profile data on GitHub
40.2/100 developing ▬ flat Agent 21/100 agent aware Front door AI 6/6 dominant saas Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →
AccessFreemiumSelf serve⚡ Free to try
1 published contract
EmailEmail DeliveryMarketing EmailSMTPTransactional Email

What this lets a business do 1

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

Marketing Management
BC-400
Campaigns
POST /campaigndraft POST /campaigndraft/{id}/send

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0
Composite quality — 40.2/100 · developing
Contract Quality 8.7 / 19
Developer Ergonomics 8.6 / 15
Access Clarity 6.9 / 15
Operational Transparency 1.0 / 10
Contract Governance 0.0 / 9
Discoverability 5.0 / 8
Regulatory Posture 2.9 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 21/100 · agent aware
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 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 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
Pagination 5 / 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 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/.
Show this score on your site. Kin Score badge preview for Mailjet It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/mailjet/"><img src="https://apis.io/badge/mailjet/card.svg" alt="Mailjet on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
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/mailjet: 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 →

Standards implemented 1

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.

SMTP
tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 8

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

Mailjet Campaigns API

Manage campaigns and drafts

Mailjet Contact Lists API

Manage contact lists and recipients

Mailjet Contacts API

Manage contacts and properties

Mailjet Event API

Retrieve real-time event data

Mailjet Send API

Send transactional and marketing emails

Mailjet Senders API

Manage verified sender addresses

Mailjet Statistics API

Retrieve aggregated sending statistics

Mailjet Templates API

Manage reusable email templates

Scroll for all 8

Open Collections 9

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

Mailjet Email Campaigns API

OPEN COLLECTION

Mailjet Email Campaigns Contact Lists API

OPEN COLLECTION

Mailjet Email Campaigns Contacts API

OPEN COLLECTION

Mailjet Email API

OPEN COLLECTION

Mailjet Email Campaigns Event API

OPEN COLLECTION

Mailjet Email Campaigns Send API

OPEN COLLECTION

Mailjet Email Campaigns Senders API

OPEN COLLECTION

Mailjet Email Campaigns Statistics API

OPEN COLLECTION

Mailjet Email Campaigns Templates API

OPEN COLLECTION

Scroll for all 9

Pricing Plans 1

Published pricing tiers and plan structures.

Mailjet Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Mailjet Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Mailjet Finops

FINOPS

Security Posture 2

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

Mailjet Authentication

http · 1 scheme

SECURITY

Mailjet Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Mailjet Agentic Access

20 operations · 10 acting

20 operations · 10 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Portal
Portal
 Signup
Signup
 Login
Login

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 3

Status, limits, changes, and where to get help

RateLimits
RateLimits
 Support
Support
 StatusPage
StatusPage

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

Website
Website
 LinkedIn
LinkedIn
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap

Source (apis.yml)

apis.yml Raw ↑ 
aid: mailjet
name: Mailjet
description: Mailjet is an email service provider offering a powerful REST API for sending transactional and marketing emails.
  It provides an easy-to-integrate API with support for PHP, Python, Ruby, Java, Node.js, C#, and Go, along with SMTP relay
  and real-time email tracking.
type: Index
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: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/mailjet.png
x-docs-platform: redocly
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-03
tags:
- Email
- Email Delivery
- Marketing Email
- SMTP
- Transactional Email
url: https://raw.githubusercontent.com/api-evangelist/mailjet/refs/heads/main/apis.yml
created: '2026-03-16'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: mailjet:mailjet-campaigns-api
  name: Mailjet Campaigns API
  description: Manage campaigns and drafts
  humanURL: https://dev.mailjet.com/
  baseURL: https://api.mailjet.com/v3
  tags:
  - Campaigns
  properties:
  - type: OpenAPI
    url: openapi/mailjet-campaigns-api-openapi.yml
  - type: Documentation
    url: https://dev.mailjet.com/email/guides/
  - type: Reference
    url: https://dev.mailjet.com/email/reference/
  - type: GettingStarted
    url: https://dev.mailjet.com/email/guides/send-api-V3/
  - type: Authentication
    url: https://dev.mailjet.com/email/guides/#authentication
- aid: mailjet:mailjet-contact-lists-api
  name: Mailjet Contact Lists API
  description: Manage contact lists and recipients
  humanURL: https://dev.mailjet.com/
  baseURL: https://api.mailjet.com/v3
  tags:
  - Contact Lists
  properties:
  - type: OpenAPI
    url: openapi/mailjet-contact-lists-api-openapi.yml
  - type: Documentation
    url: https://dev.mailjet.com/email/guides/
  - type: Reference
    url: https://dev.mailjet.com/email/reference/
  - type: GettingStarted
    url: https://dev.mailjet.com/email/guides/send-api-V3/
  - type: Authentication
    url: https://dev.mailjet.com/email/guides/#authentication
- aid: mailjet:mailjet-contacts-api
  name: Mailjet Contacts API
  description: Manage contacts and properties
  humanURL: https://dev.mailjet.com/
  baseURL: https://api.mailjet.com/v3
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/mailjet-contacts-api-openapi.yml
  - type: Documentation
    url: https://dev.mailjet.com/email/guides/
  - type: Reference
    url: https://dev.mailjet.com/email/reference/
  - type: GettingStarted
    url: https://dev.mailjet.com/email/guides/send-api-V3/
  - type: Authentication
    url: https://dev.mailjet.com/email/guides/#authentication
- aid: mailjet:mailjet-event-api
  name: Mailjet Event API
  description: Retrieve real-time event data
  humanURL: https://dev.mailjet.com/
  baseURL: https://api.mailjet.com/v3
  tags:
  - Event
  properties:
  - type: OpenAPI
    url: openapi/mailjet-event-api-openapi.yml
  - type: Documentation
    url: https://dev.mailjet.com/email/guides/
  - type: Reference
    url: https://dev.mailjet.com/email/reference/
  - type: GettingStarted
    url: https://dev.mailjet.com/email/guides/send-api-V3/
  - type: Authentication
    url: https://dev.mailjet.com/email/guides/#authentication
- aid: mailjet:mailjet-send-api
  name: Mailjet Send API
  description: Send transactional and marketing emails
  humanURL: https://dev.mailjet.com/
  baseURL: https://api.mailjet.com/v3
  tags:
  - Send
  properties:
  - type: OpenAPI
    url: openapi/mailjet-send-api-openapi.yml
  - type: Documentation
    url: https://dev.mailjet.com/email/guides/
  - type: Reference
    url: https://dev.mailjet.com/email/reference/
  - type: GettingStarted
    url: https://dev.mailjet.com/email/guides/send-api-V3/
  - type: Authentication
    url: https://dev.mailjet.com/email/guides/#authentication
- aid: mailjet:mailjet-senders-api
  name: Mailjet Senders API
  description: Manage verified sender addresses
  humanURL: https://dev.mailjet.com/
  baseURL: https://api.mailjet.com/v3
  tags:
  - Senders
  properties:
  - type: OpenAPI
    url: openapi/mailjet-senders-api-openapi.yml
  - type: Documentation
    url: https://dev.mailjet.com/email/guides/
  - type: Reference
    url: https://dev.mailjet.com/email/reference/
  - type: GettingStarted
    url: https://dev.mailjet.com/email/guides/send-api-V3/
  - type: Authentication
    url: https://dev.mailjet.com/email/guides/#authentication
- aid: mailjet:mailjet-statistics-api
  name: Mailjet Statistics API
  description: Retrieve aggregated sending statistics
  humanURL: https://dev.mailjet.com/
  baseURL: https://api.mailjet.com/v3
  tags:
  - Statistics
  properties:
  - type: OpenAPI
    url: openapi/mailjet-statistics-api-openapi.yml
  - type: Documentation
    url: https://dev.mailjet.com/email/guides/
  - type: Reference
    url: https://dev.mailjet.com/email/reference/
  - type: GettingStarted
    url: https://dev.mailjet.com/email/guides/send-api-V3/
  - type: Authentication
    url: https://dev.mailjet.com/email/guides/#authentication
- aid: mailjet:mailjet-templates-api
  name: Mailjet Templates API
  description: Manage reusable email templates
  humanURL: https://dev.mailjet.com/
  baseURL: https://api.mailjet.com/v3
  tags:
  - Templates
  properties:
  - type: OpenAPI
    url: openapi/mailjet-templates-api-openapi.yml
  - type: Documentation
    url: https://dev.mailjet.com/email/guides/
  - type: Reference
    url: https://dev.mailjet.com/email/reference/
  - type: GettingStarted
    url: https://dev.mailjet.com/email/guides/send-api-V3/
  - type: Authentication
    url: https://dev.mailjet.com/email/guides/#authentication
common:
- type: Plans
  url: plans/mailjet-plans-pricing.yml
- type: RateLimits
  url: rate-limits/mailjet-rate-limits.yml
- type: FinOps
  url: finops/mailjet-finops.yml
- type: CapabilityMap
  url: capabilities/mailjet-capability-edges.yml
  name: Mailjet Business Capability Map
- type: Website
  url: https://www.mailjet.com/
- type: AgenticAccess
  url: agentic-access/mailjet-agentic-access.yml
- type: DomainSecurity
  url: security/mailjet-domain-security.yml
- type: Authentication
  url: authentication/mailjet-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/mailjet
- type: Portal
  url: https://dev.mailjet.com/
- type: Signup
  url: https://app.mailjet.com/signup
- type: Login
  url: https://app.mailjet.com/
- type: GitHubOrganization
  url: https://github.com/mailjet
- type: Support
  url: https://documentation.mailjet.com/hc/en-us
- type: Pricing
  url: https://www.mailjet.com/pricing/
- type: StatusPage
  url: https://mailjetstatus.com/
- type: TermsOfService
  url: https://www.mailjet.com/legal/terms/
- type: PrivacyPolicy
  url: https://www.mailjet.com/legal/privacy-policy/
- type: Blog
  url: https://www.mailjet.com/blog/feed/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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