GMX (mail)

GMX (mail) is a German email and cloud service provider offering free webmail, cloud storage, news, and premium upgrades. It serves millions of users with web and mobile interfaces, providing features such as personal email addresses, cloud backup, and integrated news and entertainment content. The service emphasizes security, data protection, and a range of optional paid features for enhanced mailbox capacity and functionality.

GMX (mail) is profiled on the APIs.io network. Tagged areas include Company, Email, Cloud, Free, and German.

GMX (mail)’s developer surface includes documentation, support, engineering blog, pricing, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

19.0/100 emerging Agent 6/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

0 APIs

Company Email Cloud FreeGerman

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 19.0/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 7.6 / 17

Operational Transparency 1.2 / 11

Contract Governance 0.0 / 10

Discoverability 3.9 / 9

Regulatory Posture 2.9 / 15

Agent readiness — 6/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/gmx-net/"><img src="https://apis.io/badge/gmx-net/card.svg" alt="GMX (mail) on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

11 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 16.7 — up to +16.7 composite points
Contract Governance scores 0.0 — up to +12.0 composite points

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.

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

Security Posture 2

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

Gmx Net Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Gmx Net Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

Access & Security 6

Authentication, authorization, and security posture

Security

SecurityTxt

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Pricing

Pricing

Company 3

The organization behind the API

Newsroom

Newsroom

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: gmx-net
name: GMX (mail)
description: GMX (mail) is a German email and cloud service provider offering free webmail, cloud storage, news, and premium
  upgrades. It serves millions of users with web and mobile interfaces, providing features such as personal email addresses,
  cloud backup, and integrated news and entertainment content. The service emphasizes security, data protection, and a range
  of optional paid features for enhanced mailbox capacity and functionality.
url: https://raw.githubusercontent.com/api-evangelist/gmx-net/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-27 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-27'
modified: '2026-10-27'
tags:
- Company
- Email
- Cloud
- Free
- German
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Security
  url: https://bugbounty.gmx.net
- type: SecurityTxt
  url: well-known/gmx-net-security.txt
- type: SecurityTxt
  url: well-known/gmx-net-gmx-security.txt
- type: SecurityTxt
  url: well-known/gmx-net-connect-security.txt
- type: WellKnown
  url: well-known/gmx-net-well-known.yml
- type: Hosts
  url: hosts/gmx-net-hosts.yml
- type: Newsroom
  url: https://www.gmx.net/magazine/news/
- type: Login
  url: https://hilfe.gmx.net/account/login/index.html
- type: VulnerabilityDisclosure
  url: security/gmx-net-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/gmx-net-domain-security.yml
- type: Website
  url: https://gmx.net/
- type: Documentation
  url: https://hilfe.gmx.net/
- type: Support
  url: https://hilfe.gmx.net/
- type: PrivacyPolicy
  url: https://www.gmx.net/datenschutz/
- type: TermsOfService
  url: https://www.gmx.net/impressum/
- type: Blog
  url: https://www.gmx.net/magazine/
- type: Pricing
  url: https://www.gmx.net/mail/premium/
apis: []
x-coverage:
  state: none
  reason: no-developer-program
  detail: GMX provides email services but does not offer a public developer program or API documentation.
  evidence:
  - url: https://gmx.net/
    status: 200
  checked: '2026-10-27'
x-submission-probe: 301 https://www.gmx.net/, 2026-10-26
x-enrichment:
  date: '2026-10-27'
  status: enriched
  artifacts_added: 11
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/gmx-net"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/gmx-net/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/gmx-net/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.