Ensembl website screenshot

Ensembl

Ensembl is a genome annotation database and browser maintained by the European Bioinformatics Institute (EMBL-EBI) and the Wellcome Sanger Institute. It provides comprehensive genome data for vertebrates and other eukaryotic organisms, covering gene annotation, variant data, regulatory features, comparative genomics, and evolutionary analysis across hundreds of species. The Ensembl REST API offers language-agnostic HTTP access to this genome data without requiring local database installations or Perl API dependencies.

Ensembl is listed with 1 API on the APIs.io network. Tagged areas include Genomics, Bioinformatics, Genome Annotation, Variant Annotation, and Comparative Genomics.

Ensembl’s developer surface includes documentation, tutorials, and 13 more developer resources.

12.8/100 emerging ▬ flat Agent 3/100 human only Front door AI 1/6 silent Heartbeat 94/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →
AccessFree
1 API
GenomicsBioinformaticsGenome AnnotationVariant AnnotationComparative GenomicsLife SciencesREST API

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0
Regulatory Posture applies to this provider. Its tags matched the Health 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. Kin Score badge preview for Ensembl It updates itself when the score changes. Paste this where you link to your API docs:
<a href="https://apis.io/providers/ensembl/"><img src="https://apis.io/badge/ensembl/card.svg" alt="Ensembl 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
  • MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
  • 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)
  • Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
12 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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/ensembl/apis.yml: open an issue on github.com/api-evangelist/ensembl 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

MarketPositionDepthRegistered MCP serverDeclares compatibility
Life Sciences (Biotech and Pharma R&D) standard 34.5 (thin) - -

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 1

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

Ensembl REST API

The Ensembl REST API (v15.12) provides language-agnostic HTTP access to genome annotation data across hundreds of vertebrate and eukaryotic species. It exposes 19 endpoint categ...

Ensembl API pricing

Not yet checked against Ensembl's own pricing page. Compiled by API Evangelist on 2026-06-13 from rest.ensembl.org; confirm before you rely on a figure. A free plan or tier is listed.

PlanPrice
Public Free Access free Free

Plan details, limits and sources →

Rate limits

Compiled by API Evangelist, not yet checked against Ensembl's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Ensembl Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Ensembl Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

Security Posture 1

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

Ensembl Domain Security

TLSv1.3

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Build 3

SDKs, sample code, and the tooling you integrate with

Access & Security 1

Authentication, authorization, and security posture

Learn 1

Tutorials, courses, talks, and written guidance

Operate 3

Status, limits, changes, and where to get help

Commercial 5

Pricing, plans, and the legal terms of use

Company 1

The organization behind the API

Source (apis.yml)

apis.yml Raw ↑
aid: ensembl
name: Ensembl
description: Ensembl is a genome annotation database and browser maintained by the European Bioinformatics Institute (EMBL-EBI)
  and the Wellcome Sanger Institute. It provides comprehensive genome data for vertebrates and other eukaryotic organisms,
  covering gene annotation, variant data, regulatory features, comparative genomics, and evolutionary analysis across hundreds
  of species. The Ensembl REST API offers language-agnostic HTTP access to this genome data without requiring local database
  installations or Perl API dependencies.
type: Index
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - ensembl/ensembl-rest
  open_source: unknown
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: free
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Free
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/ensembl.png
access: 3rd-Party
created: '2026-06-13'
modified: '2026-06-13'
position: Producing
tags:
- Genomics
- Bioinformatics
- Genome Annotation
- Variant Annotation
- Comparative Genomics
- Life Sciences
- REST API
url: https://raw.githubusercontent.com/api-evangelist/ensembl/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: ensembl:rest-api
  name: Ensembl REST API
  description: The Ensembl REST API (v15.12) provides language-agnostic HTTP access to genome annotation data across hundreds
    of vertebrate and eukaryotic species. It exposes 19 endpoint categories covering genome sequences, gene and transcript
    lookups, variant effect prediction (VEP), comparative genomics (gene trees, homology, alignments), coordinate mapping
    between assemblies, regulatory features, linkage disequilibrium, ontology and taxonomy queries, phenotype annotations,
    and GA4GH-compliant genomic data access. Both GET and POST methods are available; POST endpoints support batch operations
    for multiple identifiers. No authentication is required for public use.
  humanURL: https://rest.ensembl.org
  baseURL: https://rest.ensembl.org
  tags:
  - Genomics
  - Gene Annotation
  - Variant Effect Prediction
  - Comparative Genomics
  - Sequence Retrieval
  - VEP
  - GA4GH
  properties:
  - type: Documentation
    url: https://rest.ensembl.org/documentation
  - type: Website
    url: https://rest.ensembl.org
  - type: ChangeLog
    url: https://github.com/Ensembl/ensembl-rest/wiki/Change-Log
  - type: RateLimits
    url: https://github.com/Ensembl/ensembl-rest/wiki/Rate-Limits
  - type: GitHubRepository
    url: https://github.com/Ensembl/ensembl-rest
  - type: JSONLD
    url: json-ld/ensembl-rest-api.json
common:
- type: IssueTracker
  url: https://github.com/Ensembl/ensembl-rest/issues
- type: CodeOfConduct
  url: https://github.com/Ensembl/.github/blob/master/CODE_OF_CONDUCT.md
- type: DomainSecurity
  url: security/ensembl-domain-security.yml
- type: Website
  url: https://www.ensembl.org
- type: Documentation
  url: https://rest.ensembl.org/documentation
- type: RateLimits
  url: https://github.com/Ensembl/ensembl-rest/wiki/Rate-Limits
- type: GitHubOrganization
  url: https://github.com/Ensembl
- type: GitHubRepository
  url: https://github.com/Ensembl/ensembl-rest
- type: Tutorial
  url: https://github.com/Ensembl/rest-api-jupyter-course
- type: License
  url: https://github.com/Ensembl/ensembl-rest/blob/main/LICENSE
- type: TermsOfService
  url: https://www.ensembl.org/info/about/legal/index.html
- type: PrivacyPolicy
  url: https://www.ebi.ac.uk/data-protection/ensembl/privacy-notice
- type: Plans
  url: plans/ensembl-plans-pricing.yml
- type: RateLimits
  url: rate-limits/ensembl-rate-limits.yml
- type: FinOps
  url: finops/ensembl-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Ensembl API — frequently asked questions

Does Ensembl have an API?

Yes. APIs.io lists 1 API from Ensembl, including Ensembl REST API.

How much does the Ensembl API cost?

APIs.io lists 1 pricing plan for Ensembl, with each plan's price, limits and inclusions under Pricing on this page.

Is the Ensembl API ready for AI agents?

Ensembl has a Kin Score of 12.8 out of 100 (emerging) and an Agent Readiness score of 2.5 (human-only), scored by API Evangelist on 2026-11-06.

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