Black Flag Alert

Black Flag Alert provides free credit checks for UK companies using primary public records. Operated by Plainview Ventures Limited, it computes an in‑house R‑Score from filed accounts, court judgments and other signals, covering around 3.4 million companies in England & Wales. The service is freemium with core access free and no paid tiers planned. It emphasizes no‑footprint searches and auditable scoring methodology, with detailed principles and a methodology whitepaper available.

Black Flag Alert publishes 2 API contracts indexed on the APIs.io network, including Open API v2 API, and 1 more. Tagged areas include Credit Intelligence, Company Data, Risk Scoring, UK Companies, and Financial Services.

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

Black Flag Alert’s developer surface includes pricing, documentation, API reference, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.1/100 thin Agent 20/100 agent aware Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

1 published contract

Credit Intelligence Company Data Risk ScoringUK CompaniesFinancial Services

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 39.1/100 · thin

Contract Quality 10.9 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 11.2 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 2.8 / 15

Agent readiness — 20/100 · 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 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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 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):

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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

11 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 16.7 — up to +16.7 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points
Contract Quality scores 51.2 — up to +12.2 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/blackflagalert-com/apis.yml: open an issue on github.com/api-evangelist/blackflagalert-com 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.

Black Flag Alert API

Open API v2 for Black Flag Alert providing company credit risk data.

Black Flag Alert Open API v2 API

England & Wales company credit-risk intelligence for AI agents and integrations. R-Score (0-100) combines filed accounts, filing behaviour, charges, CCJs and winding-up activity...

Pricing Plans 1

Published pricing tiers and plan structures.

Blackflagalert Com Plans Pricing

1 plans

PLANS

Semantic Vocabularies 1

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

Blackflagalert Com Context

4 classes · 9 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Black Flag Alert API Rules

42 rules · 40 errors 1 warnings 1 info

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

BatchRequest

1 properties

JSON SCHEMA

SignupRequest

2 properties

JSON SCHEMA

Security Posture 1

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

Blackflagalert Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: blackflagalert-com
name: Black Flag Alert
image: https://blackflagalert.com/logo.png
description: Black Flag Alert provides free credit checks for UK companies using primary public records. Operated by Plainview
  Ventures Limited, it computes an in‑house R‑Score from filed accounts, court judgments and other signals, covering around
  3.4 million companies in England & Wales. The service is freemium with core access free and no paid tiers planned. It emphasizes
  no‑footprint searches and auditable scoring methodology, with detailed principles and a methodology whitepaper available.
url: https://artifacts.apis.io/blackflagalert-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-02 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-02'
  method: derived
specificationVersion: '0.20'
created: '2026-11-02'
modified: '2026-11-02'
tags:
- Credit Intelligence
- Company Data
- Risk Scoring
- UK Companies
- Financial Services
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/blackflagalert-com-plans-pricing.yml
- type: Spectral
  url: rules/blackflagalert-com-rules.yml
- type: JSONLD
  url: json-ld/blackflagalert-com-context.jsonld
- type: Vocabulary
  url: vocabulary/blackflagalert-com-vocabulary.yml
- type: DataModel
  url: data-model/blackflagalert-com-data-model.yml
- type: ErrorCatalog
  url: errors/blackflagalert-com-problem-types.yml
- type: Conformance
  url: conformance/blackflagalert-com-conformance.yml
- type: LLMsTxt
  url: llms/blackflagalert-com-llms.txt
- type: Hosts
  url: hosts/blackflagalert-com-hosts.yml
- type: Vendors
  url: vendors/blackflagalert-com-vendors.yml
- type: TermsOfService
  url: https://blackflagalert.com/terms
- type: PrivacyPolicy
  url: https://blackflagalert.com/privacy
- type: Pricing
  url: https://blackflagalert.com/pricing
- type: Login
  url: https://blackflagalert.com/login
- type: Documentation
  url: https://blackflagalert.com/guides
- type: APIReference
  url: https://blackflagalert.com/developers
- type: DomainSecurity
  url: security/blackflagalert-com-domain-security.yml
- type: Website
  url: https://blackflagalert.com/
apis:
- name: Black Flag Alert API
  description: Open API v2 for Black Flag Alert providing company credit risk data.
  humanURL: https://blackflagalert.com/developers
  baseURL: https://blackflagalert.com
  properties: []
  aid: blackflagalert-com:black-flag-alert-api
- aid: blackflagalert-com:black-flag-alert-open-api-v2-api
  name: Black Flag Alert Open API v2 API
  description: 'England & Wales company credit-risk intelligence for AI agents and integrations. R-Score (0-100) combines
    filed accounts, filing

    behaviour, charges, CCJs and winding-up activity into one number. Auth: X-API-Key header. Always send a custom User-Agent
    header (default

    Python-urllib is blocked with 403'
  humanURL: https://blackflagalert.com/developers
  baseURL: https://blackflagalert.com
  properties:
  - type: OpenAPI
    url: openapi/_original/blackflagalert-com-api-openapi.json
  - type: JSONSchema
    url: json-schema/blackflagalert-com-signup-request-schema.json
  - type: JSONSchema
    url: json-schema/blackflagalert-com-batch-request-schema.json
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-11-02'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://blackflagalert.com/openapi.json
    status: null
  - url: https://blackflagalert.com/api/mcp
    status: 401
  - url: https://blackflagalert.com/
    status: 200
x-enrichment:
  date: '2026-11-02'
  status: enriched
  artifacts_added: 21
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Black Flag Alert API — frequently asked questions

Does Black Flag Alert have an API?

Yes. APIs.io lists 2 APIs from Black Flag Alert, including Black Flag Alert API and Black Flag Alert Open API v2 API.

Is there an OpenAPI specification for the Black Flag Alert API?

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

How much does the Black Flag Alert API cost?

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

Is the Black Flag Alert API ready for AI agents?

Black Flag Alert has a Kin Score of 39.1 out of 100 (thin) and an Agent Readiness score of 20.4 (agent-aware), scored by API Evangelist on 2026-11-02.

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