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.

The Mailjet catalog on APIs.io includes 1 Spectral governance ruleset.

Mailjet’s developer surface includes authentication, developer portal, signup flow, support, pricing, engineering blog, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

50.5/100 developing ▬ flat Agent 23/100 agent aware Front door AI 6/6 dominant Heartbeat 60/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Email Email Delivery Marketing Email SMTP Transactional 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

Contact ListsContacts

POST /contact PUT /contact/{id} POST /contactslist POST /contactslist/{id}/managemanycontacts

Marketing Management

BC-400

Campaigns

POST /campaigndraft POST /campaigndraft/{id}/send

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 50.5/100 · developing

Contract Quality 8.7 / 19

Developer Ergonomics 8.6 / 15

Access Clarity 12.1 / 15

Operational Transparency 3.0 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 2.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 23/100 · 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 4 / 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

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 46.3 — up to +13.4 composite points Ask about this →
Contract Governance scores 13.6 — up to +10.4 composite points Ask about this →
Operational Transparency scores 31.0 — up to +9.0 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/mailjet/apis.yml: open an issue on github.com/api-evangelist/mailjet 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 →

Standards implemented 2

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

OpenAPI

measured — observed by APIs.io (published)

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

Mailjet API pricing

Prices published by Mailjet, read 2026-10-28 from www.mailjet.com/pricing/.

Plan	Price
Free	$0/month Includes: 6,000 emails/month, 200 emails per day, 1,000 contacts
Starter	$9/month Includes: 8,000 emails/month, no daily sending limit, 2,000 contacts
Essential	$19/month Includes: 15,000 emails/month, unlimited contacts, 500 email validations, 500 Email Previews/month
Premium	$29/month Includes: 15,000 emails/month, 2,000 Email Previews/month, 1 Dedicated IP
Custom	Get a quote Includes: Enterprise Plans for high-volume senders

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Mailjet's documentation. All 5 limits →

Billed by: subscription · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Mailjet Plans Pricing

5 plans

PLANS

Mailjet Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Mailjet Rate Limits

5 limits

RATE LIMITS

Service Levels 1

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

Mailjet

SLA

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

Mailjet

9 quoted statements, read from Mailjet's own page on 2026-11-10.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

Mailjet

27 quoted statements, read from Mailjet's own page on 2026-11-10.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

Mailjet

2 quoted statements, read from Mailjet's own page on 2026-11-10.

ELIGIBILITY

Data License 1

How its data and outputs may be reused, quoted from its own terms.

Mailjet

1 quoted statement, read from Mailjet's own page on 2026-11-10.

LICENSE

FinOps 1

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

Mailjet Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Mailjet API Rules

56 rules · 53 error-severity 1 warn-severity 2 info-severity

SPECTRAL

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 (API Evangelist recommendations) 1

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

Mailjet Agentic Access

20 operations · 10 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Portal

Portal

Signup

Signup

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 7

Pricing, plans, and the legal terms of use

Plans

FinOps

Pricing

TermsOfService

PrivacyPolicy

UsageTerms

DataLicense

Scroll for all 7

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 3

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

DataProcessing

DataProcessing

Eligibility

Eligibility

Source (apis.yml)

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
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  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/
- type: UsageTerms
  url: terms/mailjet-terms-of-service.yml
- type: DataProcessing
  url: privacy/mailjet-privacy-policy.yml
- type: Eligibility
  url: eligibility/mailjet-eligibility.yml
- type: DataLicense
  url: data-license/mailjet-data-license.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Mailjet API — frequently asked questions

Does Mailjet have an API?

Yes. APIs.io lists 8 APIs from Mailjet, including Mailjet Campaigns API, Mailjet Contact Lists API and Mailjet Contacts API, and 5 more.

Is there an OpenAPI specification for the Mailjet API?

Yes. APIs.io indexes 8 OpenAPI specifications for Mailjet, each linked for download from this page.

How do I authenticate with the Mailjet API?

Mailjet uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Mailjet Authentication.

How much does the Mailjet API cost?

Mailjet publishes its prices; its Free plan is $0/month as of 2026-10-28. APIs.io lists 5 pricing plans for Mailjet, with each plan's price, limits and inclusions under Pricing on this page.

Is the Mailjet API ready for AI agents?

Mailjet has a Kin Score of 50.5 out of 100 (developing) and an Agent Readiness score of 23.4 (agent-aware), scored by API Evangelist on 2026-11-13.

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