Duck Tax

Duck Tax provides a free online checker for UK micro-entity company accounts. Users can input their financial figures to generate an FRS 105 balance sheet, identify errors, and ensure compliance before filing. The service is offered by Spark Games Ltd and aims to simplify small business accounting with a zero‑cost tool.

Duck Tax is listed with 1 API on the APIs.io network. Tagged areas include Finance, Accounting, United Kingdom, and Micro-entity.

Duck Tax’s developer surface includes documentation, API reference, pricing, and 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

19.4/100 emerging Agent 0/100 human only Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API

Finance Accounting United KingdomMicro-entity

Kin Score

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

Composite quality — 19.4/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 5.4 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.9 / 10

Discoverability 4.1 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 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 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 16.7 — up to +16.7 composite points
Access Clarity scores 31.6 — up to +13.7 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/ducktax-com/apis.yml: open an issue on github.com/api-evangelist/ducktax-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 →

APIs 1

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

Duck Tax MCP

MCP (Microservice Control Protocol) server for Duck Tax providing API access.

Security Posture 2

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

Ducktax Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Ducktax Com Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Access & Security 4

Authentication, authorization, and security posture

Security

Security

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Commercial 3

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Pricing

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: ducktax-com
name: Duck Tax
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: unreadable
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://ducktax.com/opengraph-image?48421b6213f07c99
description: Duck Tax provides a free online checker for UK micro-entity company accounts. Users can input their financial
  figures to generate an FRS 105 balance sheet, identify errors, and ensure compliance before filing. The service is offered
  by Spark Games Ltd and aims to simplify small business accounting with a zero‑cost tool.
url: https://artifacts.apis.io/ducktax-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-06 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-06'
modified: '2026-11-06'
tags:
- Finance
- Accounting
- United Kingdom
- Micro-entity
tags_raw:
- Finance
- Accounting
- UK
- Micro-entity
- Free-tool
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Security
  url: security/ducktax-com-vulnerability-disclosure.yml
- type: Conformance
  url: conformance/ducktax-com-conformance.yml
- type: LLMsTxt
  url: llms/ducktax-com-llms.txt
- type: SecurityTxt
  url: well-known/ducktax-com-security.txt
- type: WellKnown
  url: well-known/ducktax-com-well-known.yml
- type: Hosts
  url: hosts/ducktax-com-hosts.yml
- type: Vendors
  url: vendors/ducktax-com-vendors.yml
- type: VulnerabilityDisclosure
  url: security/ducktax-com-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/ducktax-com-domain-security.yml
- type: Website
  url: https://ducktax.com/
- type: Documentation
  url: https://ducktax.com/docs/mcp
- type: APIReference
  url: https://ducktax.com/docs/mcp
- type: PrivacyPolicy
  url: https://ducktax.com/privacy
- type: TermsOfService
  url: https://ducktax.com/tos
- type: Pricing
  url: https://ducktax.com/
apis:
- name: Duck Tax MCP
  description: MCP (Microservice Control Protocol) server for Duck Tax providing API access.
  humanURL: https://ducktax.com/docs/mcp
  baseURL: null
  aid: ducktax-com:duck-tax-mcp
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: MCP documentation is served as a JavaScript-rendered HTML page with no machine-readable spec.
  evidence:
  - url: https://ducktax.com/docs/mcp
    status: 200
  checked: '2026-11-06'
x-enrichment:
  date: '2026-11-06'
  status: enriched
  artifacts_added: 14
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Duck Tax API — frequently asked questions

Does Duck Tax have an API?

Yes. APIs.io lists 1 API from Duck Tax, including Duck Tax MCP.

Is the Duck Tax API ready for AI agents?

Duck Tax has a Kin Score of 19.4 out of 100 (emerging) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-06.

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