registrum-co-uk

Registrum provides a UK Companies House data API delivering financials, turnover, accounts, PSC chains, and director networks as clean JSON. The service parses iXBRL filings, resolves ownership structures, and offers rate‑limit‑proof access without requiring a Companies House API key. Users can start for free with a keyless MCP endpoint, and paid plans add higher volume and SLA support.

registrum-co-uk is listed with 1 API on the APIs.io network: Registrum API. Tagged areas include Companies House, Financial Data, JSON API, UK, and Business Intelligence.

registrum-co-uk’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

37.8/100 thin Agent 22/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 API

Companies House Financial DataJSON APIUKBusiness Intelligence

Kin Score

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

Composite quality — 37.8/100 · thin

Contract Quality 6.5 / 21

Developer Ergonomics 7.2 / 17

Access Clarity 7.6 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.7 / 10

Discoverability 5.6 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 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 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 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/.

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

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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

9 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 30.5 — up to +17.4 composite points
Operational Transparency scores 10.5 — up to +11.6 composite points
Developer Ergonomics scores 42.1 — up to +11.6 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/registrum-co-uk/apis.yml: open an issue on github.com/api-evangelist/registrum-co-uk 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 →

APIs 1

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

Registrum API

Registrum API provides UK Companies House data, financials, director networks, and enriched company profiles.

Security Posture 3

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

Registrum Co Uk Authentication

0 schemes

SECURITY

Registrum Co Uk Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Registrum Co Uk Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Registrum Co Uk Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Access & Security 8

Authentication, authorization, and security posture

Security

SecurityTxt

SecurityTxt

SecurityTxt

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Scroll for all 8

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Pricing

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: registrum-co-uk
name: registrum-co-uk
description: Registrum provides a UK Companies House data API delivering financials, turnover, accounts, PSC chains, and director
  networks as clean JSON. The service parses iXBRL filings, resolves ownership structures, and offers rate‑limit‑proof access
  without requiring a Companies House API key. Users can start for free with a keyless MCP endpoint, and paid plans add higher
  volume and SLA support.
url: https://artifacts.apis.io/registrum-co-uk/apis.yml
image: https://registrum.co.uk/brand/icon-512.png
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Companies House
- Financial Data
- JSON API
- UK
- Business Intelligence
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgentSkill
  url: skills/_index.yml
- type: Security
  url: security/registrum-co-uk-vulnerability-disclosure.yml
- type: Conformance
  url: conformance/registrum-co-uk-conformance.yml
- type: LLMsTxt
  url: llms/registrum-co-uk-llms.txt
- type: SecurityTxt
  url: well-known/registrum-co-uk-staging-security.txt
- type: SecurityTxt
  url: well-known/registrum-co-uk-security.txt
- type: SecurityTxt
  url: well-known/registrum-co-uk-mcp-security.txt
- type: SecurityTxt
  url: well-known/registrum-co-uk-eccta-security.txt
- type: SecurityTxt
  url: well-known/registrum-co-uk-api-security.txt
- type: WellKnown
  url: well-known/registrum-co-uk-well-known.yml
- type: Hosts
  url: hosts/registrum-co-uk-hosts.yml
- type: Vendors
  url: vendors/registrum-co-uk-vendors.yml
- type: TermsOfService
  url: https://registrum.co.uk/terms
- type: PrivacyPolicy
  url: https://registrum.co.uk/privacy
- type: VulnerabilityDisclosure
  url: security/registrum-co-uk-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/registrum-co-uk-domain-security.yml
- type: Website
  url: https://registrum.co.uk/
- type: Documentation
  url: https://api.registrum.co.uk/docs
- type: APIReference
  url: https://api.registrum.co.uk/docs
- type: GettingStarted
  url: https://registrum.co.uk/guides/how-to-get-a-companies-house-api-key
- type: Support
  url: https://registrum.co.uk/report
- type: Blog
  url: https://registrum.co.uk/articles
- type: Pricing
  url: https://registrum.co.uk/#pricing
- type: SignUp
  url: https://registrum.co.uk/#get-key
apis:
- aid: registrum-co-uk:registrum-api
  name: Registrum API
  description: Registrum API provides UK Companies House data, financials, director networks, and enriched company profiles.
  humanURL: https://api.registrum.co.uk/docs
  baseURL: https://api.registrum.co.uk
  tags:
  - Companies House
  - Financial Data
  - UK
  properties:
  - type: OpenAPI
    url: openapi/registrum-co-uk-openapi.json
  - type: Documentation
    url: https://api.registrum.co.uk/docs
  - type: APIReference
    url: https://api.registrum.co.uk/docs
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 32
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

registrum-co-uk API — frequently asked questions

Does registrum-co-uk have an API?

Yes. APIs.io lists 1 API from registrum-co-uk, including Registrum API.

Is there an OpenAPI specification for the registrum-co-uk API?

Yes. APIs.io indexes 1 OpenAPI specification for registrum-co-uk, each linked for download from this page.

How do I authenticate with the registrum-co-uk API?

registrum-co-uk documents its authentication (0 schemes). The details are profiled on APIs.io as Registrum Co Uk Authentication.

Is the registrum-co-uk API ready for AI agents?

registrum-co-uk has a Kin Score of 37.8 out of 100 (thin) and an Agent Readiness score of 22.2 (agent-aware), scored by API Evangelist on 2026-10-31.

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