OpenCorporates

OpenCorporates is the world's largest open database of companies, providing a REST API for searching and retrieving company registration data, officer information, and corporate filings globally across more than 140 jurisdictions. The API enables access to company details, director and officer records, statutory filings, and corporate groupings, making it a primary resource for compliance, due diligence, investigative journalism, and corporate transparency.

OpenCorporates is listed with 2 APIs on the APIs.io network. Tagged areas include Companies, Corporate Data, Business Intelligence, Compliance, and Due Diligence.

OpenCorporates’ developer surface includes documentation, engineering blog, pricing, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

19.1/100 emerging ▬ flat Agent 14/100 agent aware Front door AI 1/6 silent Heartbeat 96/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

2 APIs

CompaniesCorporate DataBusiness Intelligence Compliance Due Diligence Officers FilingsCorporate TransparencyOpen Data

Kin Score

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

Composite quality — 19.1/100 · emerging

Contract Quality 5.1 / 21

Developer Ergonomics 2.0 / 17

Access Clarity 2.5 / 17

Operational Transparency 2.6 / 11

Contract Governance 0.0 / 10

Discoverability 5.6 / 9

Regulatory Posture 0.0 / 15

Agent readiness — 14/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 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

MCP Tool Quality 6 / 6

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 Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
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) 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 →

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 24.0 — up to +19.0 composite points Ask about this →
Developer Ergonomics scores 11.9 — up to +17.6 composite points Ask about this →
Access Clarity scores 14.9 — up to +17.0 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/open-corporates/apis.yml: open an issue on github.com/api-evangelist/open-corporates 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 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.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

OpenCorporates API

REST API providing access to the world's largest open database of companies. Search and retrieve company registration data, officer information, corporate filings, and jurisdict...

OpenCorporates

Data on corporate entities and directors in many countries

OpenCorporates API pricing

Not yet checked against OpenCorporates's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free	Free
Essentials	GBP 2250
Starter	GBP 6600
Basic	GBP 12000
Enterprise	—
Public Benefit Access	Free

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

OpenCorporates Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

OpenCorporates Rate Limits

9 limits

RATE LIMITS

Service Levels 1

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

OpenCorporates

SLA

FinOps 1

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

OpenCorporates Finops

FINOPS

Security Posture 1

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

OpenCorporates Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: open-corporates
name: OpenCorporates
description: OpenCorporates is the world's largest open database of companies, providing a REST API for searching and retrieving
  company registration data, officer information, and corporate filings globally across more than 140 jurisdictions. The API
  enables access to company details, director and officer records, statutory filings, and corporate groupings, making it a
  primary resource for compliance, due diligence, investigative journalism, and corporate transparency.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/open-corporates.png
url: https://raw.githubusercontent.com/api-evangelist/open-corporates/refs/heads/main/apis.yml
created: 2026-06-13
modified: 2026-06-13
specificationVersion: '0.23'
tags:
- Companies
- Corporate Data
- Business Intelligence
- Compliance
- Due Diligence
- Officers
- Filings
- Corporate Transparency
- Open Data
apis:
- aid: open-corporates:open-corporates-api
  name: OpenCorporates API
  description: REST API providing access to the world's largest open database of companies. Search and retrieve company registration
    data, officer information, corporate filings, and jurisdiction data across more than 140 jurisdictions globally.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://opencorporates.com
  baseURL: https://api.opencorporates.com/v0.4
  tags:
  - Companies
  - Officers
  - Filings
  - Corporate Data
  properties:
  - type: Documentation
    url: https://api.opencorporates.com/documentation/API-Reference
  - type: OpenAPI
    url: https://api.opencorporates.com/documentation/API-Reference
  contact:
  - FN: OpenCorporates API Support
    email: api@opencorporates.com
    url: https://opencorporates.com/contact
- name: OpenCorporates
  description: Data on corporate entities and directors in many countries
  humanURL: http://api.opencorporates.com/documentation/API-Reference
  baseURL: http://api.opencorporates.com/documentation/API-Reference
  tags:
  - Open Data
  properties:
  - type: Documentation
    url: http://api.opencorporates.com/documentation/API-Reference
common:
- type: DomainSecurity
  url: security/open-corporates-domain-security.yml
- type: Website
  url: https://opencorporates.com
- type: Documentation
  url: https://api.opencorporates.com/documentation/API-Reference
- type: GitHubOrg
  url: https://github.com/openc
- type: LinkedIn
  url: https://www.linkedin.com/company/opencorporates
- type: Blog
  url: https://blog.opencorporates.com
- type: Pricing
  url: https://opencorporates.com/pricing/
- type: StatusPage
  url: https://status.opencorporates.com/
- type: X
  url: https://twitter.com/opencorporates
- type: Plans
  url: plans/open-corporates-plans-pricing.yml
- type: RateLimits
  url: rate-limits/open-corporates-rate-limits.yml
- type: FinOps
  url: finops/open-corporates-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

OpenCorporates API — frequently asked questions

Does OpenCorporates have an API?

Yes. APIs.io lists 2 APIs from OpenCorporates, including OpenCorporates API and OpenCorporates.

Is there an OpenAPI specification for the OpenCorporates API?

Yes. APIs.io indexes 1 OpenAPI specification for OpenCorporates, each linked for download from this page.

How much does the OpenCorporates API cost?

APIs.io lists 6 pricing plans for OpenCorporates, with each plan's price, limits and inclusions under Pricing on this page.

Is the OpenCorporates API ready for AI agents?

OpenCorporates has a Kin Score of 19.1 out of 100 (emerging) and an Agent Readiness score of 13.6 (agent-aware), scored by API Evangelist on 2026-11-13.

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