Crew of the Captain

Crew of the Captain is a small software house that designs and builds web applications, marketplace add‑ons, and creative 3D tools. They work in clear, checkable steps, delivering projects with a focus on automation and AI‑assisted tooling. Their services include fast maintainable web apps, integrations for platforms like Zendesk and Atlassian, and procedural generators for game and design pipelines, all crafted by a steady crew of developers.

Crew of the Captain publishes 3 API contracts indexed on the APIs.io network, including Types API, Validation API, and 1 more. Tagged areas include Software House, Web Development, Marketplace Apps, Creative Tools, and Automation.

The Crew of the Captain catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

🌐 Visit website 📡 Profile data on GitHub

19.5/100 emerging Agent 34/100 agent ready Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 1 MCP Servers

Software HouseWeb DevelopmentMarketplace AppsCreative Tools Automation

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 19.5/100 · emerging

Contract Quality 10.3 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 4.5 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 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):

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)
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
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 0.0 — up to +20.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Operational Transparency scores 0.0 — up to +13.0 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/crewofthecaptain-com/apis.yml: open an issue on github.com/api-evangelist/crewofthecaptain-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 3

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.

Agent2Agent

measured — observed by APIs.io (conformant)

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 3

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

Crew of the Captain API

Format and checksum validation for IBAN, EU VAT, Polish NIP/REGON/PESEL and email, pay-per-call via x402.

Crew of the Captain Types API

The Types API from Crew of the Captain — 1 operation(s) for types.

Crew of the Captain Validation API

The validation API from Crew of the Captain — 6 operation(s) for validation.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Crew of the Captain MCP Server

Remote MCP server at validate.crewofthecaptain.com.

MCP SERVER

Semantic Vocabularies 1

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

Crewofthecaptain Com Context

1 classes · 5 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Crew of the Captain API Rules

41 rules · 32 errors 1 warnings 8 info

SPECTRAL

Security Posture 1

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

Crewofthecaptain Com Domain Security

TLSv1.3

SECURITY

Agentic Access 1

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

Crewofthecaptain Com Agentic Access

7 operations · 6 acting

AGENTIC

Resources

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

LLMsTxt

MCPServer

WellKnown

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

Company 1

The organization behind the API

Website

Website

Other 3

Properties that don't map to a standard resource type

AgentCard

AgentCard

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: crewofthecaptain-com
name: Crew of the Captain
description: Crew of the Captain is a small software house that designs and builds web applications, marketplace add‑ons,
  and creative 3D tools. They work in clear, checkable steps, delivering projects with a focus on automation and AI‑assisted
  tooling. Their services include fast maintainable web apps, integrations for platforms like Zendesk and Atlassian, and procedural
  generators for game and design pipelines, all crafted by a steady crew of developers.
url: https://artifacts.apis.io/crewofthecaptain-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-04 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.20'
created: '2026-11-04'
modified: '2026-11-04'
tags:
- Software House
- Web Development
- Marketplace Apps
- Creative Tools
- Automation
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/crewofthecaptain-com-agentic-access.yml
- type: Spectral
  url: rules/crewofthecaptain-com-rules.yml
- type: JSONLD
  url: json-ld/crewofthecaptain-com-context.jsonld
- type: Vocabulary
  url: vocabulary/crewofthecaptain-com-vocabulary.yml
- type: DataModel
  url: data-model/crewofthecaptain-com-data-model.yml
- type: ErrorCatalog
  url: errors/crewofthecaptain-com-problem-types.yml
- type: Conformance
  url: conformance/crewofthecaptain-com-conformance.yml
- type: LLMsTxt
  url: llms/crewofthecaptain-com-llms.txt
- type: AgentCard
  url: a2a/crewofthecaptain-com-a2a.yml
- type: MCPServer
  url: mcp/crewofthecaptain-com-mcp.yml
- type: WellKnown
  url: well-known/crewofthecaptain-com-well-known.yml
- type: Hosts
  url: hosts/crewofthecaptain-com-hosts.yml
- type: Vendors
  url: vendors/crewofthecaptain-com-vendors.yml
- type: DomainSecurity
  url: security/crewofthecaptain-com-domain-security.yml
- type: Website
  url: https://crewofthecaptain.com/
apis:
- name: Crew of the Captain API
  description: Format and checksum validation for IBAN, EU VAT, Polish NIP/REGON/PESEL and email, pay-per-call via x402.
  humanURL: https://validate.crewofthecaptain.com/
  baseURL: null
  openAPI:
    url: openapi/crewofthecaptain-com-openapi.json
  aid: crewofthecaptain-com:crew-of-the-captain-api
- aid: crewofthecaptain-com:crewofthecaptain-com-types-api
  name: Crew of the Captain Types API
  description: The Types API from Crew of the Captain — 1 operation(s) for types.
  humanURL: https://validate.crewofthecaptain.com/
  baseURL: https://validate.crewofthecaptain.com
  tags:
  - Types
  properties:
  - type: OpenAPI
    url: openapi/crewofthecaptain-com-types-api-openapi.yml
- aid: crewofthecaptain-com:crewofthecaptain-com-validation-api
  name: Crew of the Captain Validation API
  description: The validation API from Crew of the Captain — 6 operation(s) for validation.
  humanURL: https://validate.crewofthecaptain.com/
  baseURL: https://validate.crewofthecaptain.com
  tags:
  - Validation
  tags_raw:
  - validation
  properties:
  - type: OpenAPI
    url: openapi/crewofthecaptain-com-validation-api-openapi.yml
x-enrichment:
  date: '2026-11-04'
  status: enriched
  artifacts_added: 22
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Crew of the Captain API — frequently asked questions

Does Crew of the Captain have an API?

Yes. APIs.io lists 3 APIs from Crew of the Captain, including Crew of the Captain API, Crew of the Captain Types API and Crew of the Captain Validation API.

Is there an OpenAPI specification for the Crew of the Captain API?

Yes. APIs.io indexes 2 OpenAPI specifications for Crew of the Captain, each linked for download from this page.

Does Crew of the Captain have an MCP server?

Yes. APIs.io lists 1 MCP server for Crew of the Captain: Remote MCP server at validate.crewofthecaptain.com.

Is the Crew of the Captain API ready for AI agents?

Crew of the Captain has a Kin Score of 19.5 out of 100 (emerging) and an Agent Readiness score of 34.0 (agent-ready), scored by API Evangelist on 2026-11-06.

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