Ask Marcel

Ask Marcel provides the largest HVAC troubleshooting database for UK engineers, offering over 400,000 error codes across 126 brands and 905 models. The platform includes a web and mobile app, API/MCP for developers, and detailed documentation to integrate fault code lookup into tools and services. It aims to simplify HVAC maintenance, reduce downtime, and support both technicians and integrators with comprehensive manufacturer-sourced information.

Ask Marcel publishes 1 API contract indexed on the APIs.io network. Tagged areas include HVAC, Engineering, Troubleshooting, and Database.

The Ask Marcel catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

Ask Marcel’s developer surface includes authentication, support, getting-started guide, documentation, API reference, engineering blog, pricing, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

51.7/100 developing Agent 41/100 agent ready Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

HVAC Engineering Troubleshooting Database

Kin Score

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

Composite quality — 51.7/100 · developing

Contract Quality 11.3 / 21

Developer Ergonomics 10.8 / 17

Access Clarity 11.2 / 17

Operational Transparency 1.5 / 11

Contract Governance 3.6 / 10

Discoverability 4.9 / 9

Regulatory Posture 3.1 / 15

Agent readiness — 41/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 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
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)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

4 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 53.2 — up to +11.7 composite points
Operational Transparency scores 13.2 — up to +11.3 composite points
Contract Governance scores 35.6 — up to +7.7 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/askmarcel-app/apis.yml: open an issue on github.com/api-evangelist/askmarcel-app 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 2

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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 1

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

AskMarcel API

API REST for accessing technical knowledge from AskMarcel.

Pricing Plans 1

Published pricing tiers and plan structures.

Askmarcel App Plans Pricing

3 plans

PLANS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Askmarcel App Webhooks

ASYNCAPI

Semantic Vocabularies 1

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

Askmarcel App Context

55 classes · 214 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Ask Marcel API Rules

44 rules · 33 errors 7 warnings 4 info

SPECTRAL

Security Posture 2

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

Askmarcel App Authentication

2 schemes

SECURITY

Askmarcel App Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

Login

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

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 9

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Idempotency

Conventions

Webhooks

DataModel

ErrorCatalog

Conformance

Scroll for all 9

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

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: askmarcel-app
name: Ask Marcel
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  probe_state: gated
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
image: https://askmarcel.app/opengraph-image
description: Ask Marcel provides the largest HVAC troubleshooting database for UK engineers, offering over 400,000 error codes
  across 126 brands and 905 models. The platform includes a web and mobile app, API/MCP for developers, and detailed documentation
  to integrate fault code lookup into tools and services. It aims to simplify HVAC maintenance, reduce downtime, and support
  both technicians and integrators with comprehensive manufacturer-sourced information.
url: https://artifacts.apis.io/askmarcel-app/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)
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- HVAC
- Engineering
- Troubleshooting
- Database
tags_raw:
- HVAC
- Engineering
- Troubleshooting
- Database
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/askmarcel-app-rules.yml
- type: JSONLD
  url: json-ld/askmarcel-app-context.jsonld
- type: Vocabulary
  url: vocabulary/askmarcel-app-vocabulary.yml
- type: Idempotency
  url: conventions/askmarcel-app-conventions.yml
- type: Conventions
  url: conventions/askmarcel-app-conventions.yml
- type: Plans
  url: plans/askmarcel-app-plans-pricing.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/askmarcel-app-webhooks.yml
- type: DataModel
  url: data-model/askmarcel-app-data-model.yml
- type: Authentication
  url: authentication/askmarcel-app-authentication.yml
- type: ErrorCatalog
  url: errors/askmarcel-app-problem-types.yml
- type: Conformance
  url: conformance/askmarcel-app-conformance.yml
- type: LLMsTxt
  url: llms/askmarcel-app-llms.txt
- type: WellKnown
  url: well-known/askmarcel-app-well-known.yml
- type: Hosts
  url: hosts/askmarcel-app-hosts.yml
- type: Vendors
  url: vendors/askmarcel-app-vendors.yml
- type: Support
  url: https://askmarcel.app/fr/support
- type: PrivacyPolicy
  url: https://askmarcel.app/fr/privacy
- type: Login
  url: https://dashboard.askmarcel.app/login
- type: DeveloperPortal
  url: https://app.askmarcel.app/developers
- type: GettingStarted
  url: https://askmarcel.app/fr/api/docs/quickstart
- type: GitHubOrganization
  url: https://github.com/askmarcel
- type: DomainSecurity
  url: security/askmarcel-app-domain-security.yml
- type: Website
  url: https://askmarcel.app/
- type: Documentation
  url: https://askmarcel.app/en/api/docs
- type: APIReference
  url: https://askmarcel.app/en/api
- type: Blog
  url: https://askmarcel.app/en/blog
- type: Pricing
  url: https://askmarcel.app/en/pricing
apis:
- name: AskMarcel API
  description: API REST for accessing technical knowledge from AskMarcel.
  humanURL: https://askmarcel.app/en/api/docs
  baseURL: https://api.askmarcel.app/v1
  aid: askmarcel-app:askmarcel-api
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://api.askmarcel.app/v1/openapi.json
    status: null
  - url: https://api.askmarcel.app/api/mcp
    status: 401
  - url: https://app.askmarcel.app/api/mcp
    status: 401
  - url: https://web.askmarcel.app/api/mcp
    status: 401
  - url: https://askmarcel.app/
    status: 200
x-enrichment:
  date: '2026-11-02'
  status: enriched
  artifacts_added: 23
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Ask Marcel API — frequently asked questions

Does Ask Marcel have an API?

Yes. APIs.io lists 1 API from Ask Marcel, including AskMarcel API.

How do I authenticate with the Ask Marcel API?

Ask Marcel documents its authentication (2 schemes). The details are profiled on APIs.io as Askmarcel App Authentication.

How much does the Ask Marcel API cost?

APIs.io lists 3 pricing plans for Ask Marcel, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Ask Marcel API ready for AI agents?

Ask Marcel has a Kin Score of 51.7 out of 100 (developing) and an Agent Readiness score of 40.7 (agent-ready), scored by API Evangelist on 2026-11-02.

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