ECMWF

ECMWF, the European Centre for Medium-Range Weather Forecasts, is an intergovernmental organisation that is both a research institute and a 24/7 operational service, producing global numerical weather predictions and other data for its Member and Co-operating States and the broader community. It operates one of the largest supercomputer facilities and meteorological data archives in the world, and offers programmatic data access through the ECMWF Web API and its Free & Open Data portal.

ECMWF publishes 4 API contracts indexed on the APIs.io network, including Data Stores Processing API, Data Stores STAC Catalogue API, Data Stores Profile API, and 1 more. Tagged areas include Company, Weather, Meteorology, Forecasting, and Climate.

The ECMWF catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

ECMWF’s developer surface includes authentication, documentation, API reference, support, engineering blog, pricing, signup flow, and 26 more developer resources.

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50.0/100 developing Agent 37/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

6 published contracts 6 Agent Skills

Company Weather Meteorology Forecasting Climate Open Data ResearchIntergovernmental

Kin Score

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

Composite quality — 50.0/100 · developing

Contract Quality 12.4 / 21

Developer Ergonomics 7.6 / 17

Access Clarity 7.6 / 17

Operational Transparency 2.3 / 11

Contract Governance 3.6 / 10

Discoverability 6.2 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 37/100 · 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 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 0 / 3

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector 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/.

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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
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
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

6 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 44.6 — up to +11.1 composite points
Access Clarity scores 44.7 — up to +11.1 composite points
Contract Quality scores 58.5 — up to +10.4 composite points

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Ecmwf Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Ecmwf Context

102 classes · 176 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

ECMWF API Rules

12 rules · 6 errors 5 warnings 1 info

SPECTRAL

OpenAPI Overlays 3

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Ecmwf Catalogue Overlay

2 actions · update · ecmwf-data-stores-catalogue-openapi.yml

DERIVED

Ecmwf Processing Overlay

12 actions · security · ecmwf-data-stores-processing-openapi.yml

DERIVED

Ecmwf Profiles Overlay

12 actions · security · ecmwf-data-stores-profiles-openapi.yml

DERIVED

3 properties

JSON SCHEMA

Scroll for all 18

Security Posture 2

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

Ecmwf Authentication

2 schemes

SECURITY

Ecmwf Domain Security

TLSv1.3 · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Ecmwf Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Ecmwf Agentic Access

54 operations · 17 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

Login

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

WellKnown

WellKnown

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conventions

Lifecycle

ErrorCatalog

Conformance

Scroll for all 8

Build 4

SDKs, sample code, and the tooling you integrate with

IntegrationEdges

IntegrationEdges

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Blog

Blog

Newsroom

Newsroom

Other 3

Properties that don't map to a standard resource type

Overlay

Overlay

Hosts

Hosts

OpenData

OpenData

Source (apis.yml)

aid: ecmwf
name: ECMWF
description: ECMWF, the European Centre for Medium-Range Weather Forecasts, is an intergovernmental organisation that is both
  a research institute and a 24/7 operational service, producing global numerical weather predictions and other data for its
  Member and Co-operating States and the broader community. It operates one of the largest supercomputer facilities and meteorological
  data archives in the world, and offers programmatic data access through the ECMWF Web API and its Free & Open Data portal.
url: https://raw.githubusercontent.com/api-evangelist/ecmwf/refs/heads/main/apis.yml
x-type: company
x-source: harvest:kin-score-markets
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-18 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-18'
modified: '2026-10-18'
tags:
- Company
- Weather
- Meteorology
- Forecasting
- Climate
- Open Data
- Research
- Intergovernmental
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://www.ecmwf.int/themes/ecmwf/logo.svg
common:
- type: AgenticAccess
  url: agentic-access/ecmwf-agentic-access.yml
- type: Spectral
  url: rules/ecmwf-rules.yml
- type: JSONLD
  url: json-ld/ecmwf-context.jsonld
- type: Vocabulary
  url: vocabulary/ecmwf-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/ecmwf-data-model.yml
- type: Conventions
  url: conventions/ecmwf-conventions.yml
- type: Authentication
  url: authentication/ecmwf-authentication.yml
- type: Lifecycle
  url: lifecycle/ecmwf-lifecycle.yml
- type: ErrorCatalog
  url: errors/ecmwf-problem-types.yml
- type: Conformance
  url: conformance/ecmwf-conformance.yml
- type: Overlay
  url: overlays/ecmwf-catalogue-overlay.yaml
- type: WellKnown
  url: well-known/ecmwf-well-known.yml
- type: Hosts
  url: hosts/ecmwf-hosts.yml
- type: IntegrationEdges
  url: integrations/ecmwf-integration-edges.yml
- type: SDKs
  url: packages/ecmwf-packages.yml
- type: Packages
  url: packages/ecmwf-packages.yml
- type: DomainSecurity
  url: security/ecmwf-domain-security.yml
- type: Website
  url: https://www.ecmwf.int/
- type: Documentation
  url: https://www.ecmwf.int/en/forecasts/documentation-and-support
- type: APIReference
  url: https://www.ecmwf.int/en/computing/software/ecmwf-web-api
- type: Documentation
  name: ECMWF Web API (Confluence)
  url: https://confluence.ecmwf.int/display/WEBAPI
- type: OpenData
  url: https://data.ecmwf.int/
- type: Support
  url: https://www.ecmwf.int/en/support
- type: Blog
  url: https://www.ecmwf.int/en/about/media-centre/science-blog
- type: Newsroom
  url: https://www.ecmwf.int/en/about/media-centre/news
- type: GitHubOrganization
  url: https://github.com/ecmwf
- type: Pricing
  name: Licences available
  url: https://www.ecmwf.int/en/forecasts/accessing-forecasts/licences-available
- type: SignUp
  url: https://www.ecmwf.int/user/register
- type: Login
  url: https://www.ecmwf.int/user/login
- type: StatusPage
  url: https://status.ecmwf.int/
- type: TermsOfService
  url: https://www.ecmwf.int/en/terms-use
- type: PrivacyPolicy
  url: https://www.ecmwf.int/en/privacy
apis:
- name: ECMWF Data Stores Processing API
  description: OGC API - Processes compliant REST API that enables the submission of processing tasks (data retrieval) to
    the ECMWF Data Stores system (Climate, Atmosphere and Early Warning Data Stores), with job monitoring, cost estimation
    and results retrieval.
  humanURL: https://cds.climate.copernicus.eu/how-to-api
  baseURL: https://cds.climate.copernicus.eu/api/retrieve/v1
  tags:
  - Weather
  - Climate
  - Data
  properties:
  - type: OpenAPI
    url: openapi/ecmwf-data-stores-processing-openapi.yml
  - type: OpenAPI
    name: OpenAPI (provider-hosted)
    url: https://cds.climate.copernicus.eu/api/retrieve/v1/openapi.json
  - type: Documentation
    url: https://cds.climate.copernicus.eu/how-to-api
  - type: JSONSchema
    url: json-schema/ecmwf-get-process-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-post-process-execution-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-post-process-execute-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-delete-job-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-get-job-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-request-cost-schema.json
  x-ownership: Served on Copernicus hosts because ECMWF implements C3S and CAMS (https://www.ecmwf.int/en/about/what-we-do/copernicus);
    the contract's info.title names ECMWF Data Stores.
  aid: ecmwf:ecmwf-data-stores-processing-api
- name: ECMWF Data Stores STAC Catalogue API
  description: STAC compliant API to access the ECMWF Data Stores catalogues - dataset collections, search, licences and keyword
    vocabularies, and dataset messages and changelogs.
  humanURL: https://cds.climate.copernicus.eu/how-to-api
  baseURL: https://cds.climate.copernicus.eu/api/catalogue/v1
  tags:
  - Weather
  - Climate
  - Data
  properties:
  - type: OpenAPI
    url: openapi/ecmwf-data-stores-catalogue-openapi.yml
  - type: OpenAPI
    name: OpenAPI (provider-hosted)
    url: https://cds.climate.copernicus.eu/api/catalogue/v1/openapi.json
  - type: Documentation
    url: https://cds.climate.copernicus.eu/how-to-api
  - type: JSONSchema
    url: json-schema/ecmwf-collection-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-landing-page-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-licence-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-content-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-form-data-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-collections-schema.json
  x-ownership: Served on Copernicus hosts because ECMWF implements C3S and CAMS (https://www.ecmwf.int/en/about/what-we-do/copernicus);
    the contract's info.title names ECMWF Data Stores.
  aid: ecmwf:ecmwf-data-stores-stac-catalogue-api
- name: ECMWF Data Stores Profile API
  description: REST API to handle user authentication and users' data for the ECMWF Data Stores (OIDC and personal access
    token verification, licence acceptance, starred datasets and profile vocabularies).
  humanURL: https://cds.climate.copernicus.eu/how-to-api
  baseURL: https://cds.climate.copernicus.eu/api/profiles/v1
  tags:
  - Weather
  - Climate
  - Data
  properties:
  - type: OpenAPI
    url: openapi/ecmwf-data-stores-profiles-openapi.yml
  - type: OpenAPI
    name: OpenAPI (provider-hosted)
    url: https://cds.climate.copernicus.eu/api/profiles/v1/openapi.json
  - type: Documentation
    url: https://cds.climate.copernicus.eu/how-to-api
  - type: JSONSchema
    url: json-schema/ecmwf-user-info-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-user-creation-data-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-user-data-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-minimal-user-info-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-user-pat-schema.json
  - type: JSONSchema
    url: json-schema/ecmwf-thematic-activities-schema.json
  x-ownership: Served on Copernicus hosts because ECMWF implements C3S and CAMS (https://www.ecmwf.int/en/about/what-we-do/copernicus);
    the contract's info.title names ECMWF Data Stores.
  aid: ecmwf:ecmwf-data-stores-profile-api
- name: ECMWF Web API
  description: Programmatic access to ECMWF data archives (MARS and public datasets) through the ECMWF Web API at api.ecmwf.int,
    used by the ecmwf-api-client Python library with a personal API key. No machine-readable contract is published; the base
    answers 403 "Missing access token" without credentials.
  humanURL: https://www.ecmwf.int/en/computing/software/ecmwf-web-api
  baseURL: https://api.ecmwf.int/v1
  tags:
  - Weather
  - Data
  properties:
  - type: Documentation
    url: https://confluence.ecmwf.int/display/WEBAPI
  aid: ecmwf:ecmwf-web-api
x-coverage:
  state: covered
  reason: identity-verified
  detail: Website, description, image and link pointers verified against www.ecmwf.int pages on 2026-10-18.
  evidence:
  - url: https://www.ecmwf.int/
    status: 200
  - url: https://www.ecmwf.int/themes/ecmwf/logo.svg
    status: 200
  - url: https://www.ecmwf.int/en/computing/software/ecmwf-web-api
    status: 200
  - url: https://confluence.ecmwf.int/display/WEBAPI
    status: 200
  - url: https://www.ecmwf.int/en/about/media-centre/science-blog
    status: 200
  - url: https://github.com/ecmwf
    status: 200
  - url: https://www.ecmwf.int/user/register
    status: 200
  - url: https://api.ecmwf.int/v1
    status: 403
x-enrichment:
  date: '2026-10-18'
  status: enriched
  artifacts_added: 62
  pass: modular-v1
  engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=deepseek,regulatory=anthropic

ECMWF API — frequently asked questions

Does ECMWF have an API?

Yes. APIs.io lists 4 APIs from ECMWF, including ECMWF Data Stores Processing API, ECMWF Data Stores STAC Catalogue API and ECMWF Data Stores Profile API, and 1 more.

Is there an OpenAPI specification for the ECMWF API?

Yes. APIs.io indexes 3 OpenAPI specifications for ECMWF, each linked for download from this page.

How do I authenticate with the ECMWF API?

ECMWF documents its authentication (2 schemes). The details are profiled on APIs.io as Ecmwf Authentication.

Is the ECMWF API ready for AI agents?

ECMWF has a Kin Score of 50.0 out of 100 (developing) and an Agent Readiness score of 36.8 (agent-ready), scored by API Evangelist on 2026-10-31.

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