Clear Books

Clear Books is UK cloud accounting software with a REST API for managing invoices, expenses, bank transactions, contacts, reports, and tax submissions for small businesses.

Clear Books is listed with 1 API on the APIs.io network. Tagged areas include Accounting, Invoicing, Finance, United Kingdom, and Small Business.

The Clear Books catalog on APIs.io includes 1 JSON-LD context.

Clear Books’ developer surface includes documentation, engineering blog, pricing, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

21.5/100 emerging ▬ flat Agent 3/100 human only Front door AI 1/6 silent Heartbeat 75/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 API

Accounting Invoicing Finance United Kingdom Small BusinessMTDTax

Kin Score

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

Composite quality — 21.5/100 · emerging

Contract Quality 3.1 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 3.1 / 17

Operational Transparency 2.9 / 11

Contract Governance 0.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 2.5 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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
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
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

11 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 14.7 — up to +21.3 composite points
Access Clarity scores 18.4 — up to +16.3 composite points
Developer Ergonomics scores 23.8 — up to +15.2 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/clearbooks/apis.yml: open an issue on github.com/api-evangelist/clearbooks 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.

Clear Books REST API

RESTful API for integrating with Clear Books accounting software to manage invoices, payments, contacts, bank transactions, and expenses.

Clear Books API pricing

Not yet checked against Clear Books's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Sole Trader Free	Free
Property Free	Free
Sole Trader	GBP 5
Sole Trader + VAT	GBP 15
Property	GBP 5
Small	GBP 16
Medium	GBP 34
Large	GBP 44

Plan details, limits and sources →

Rate limits

Compiled by API Evangelist, not yet checked against Clear Books's documentation. All 2 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Clearbooks Plans Pricing

8 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Clearbooks Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Clearbooks Finops

FINOPS

Semantic Vocabularies 1

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

Clearbooks Context

28 classes · 27 properties

JSON-LD

Security Posture 1

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

Clearbooks Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: clearbooks
name: Clear Books
description: Clear Books is UK cloud accounting software with a REST API for managing invoices, expenses, bank transactions,
  contacts, reports, and tax submissions for small businesses.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/clearbooks.png
url: https://raw.githubusercontent.com/api-evangelist/clearbooks/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
x-docs-platform: redocly
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-09-24
tags:
- Accounting
- Invoicing
- Finance
- United Kingdom
- Small Business
- MTD
- Tax
tags_raw:
- Accounting
- Invoicing
- Finance
- UK
- Small Business
- MTD
- Tax
apis:
- name: Clear Books REST API
  description: RESTful API for integrating with Clear Books accounting software to manage invoices, payments, contacts, bank
    transactions, and expenses.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://api-docs.clearbooks.co.uk/
  baseURL: https://api.clearbooks.co.uk/
  tags:
  - Accounting
  - Invoicing
  - Expenses
  - Contacts
  - Bank Transactions
  - Tax
  properties:
  - type: Documentation
    url: https://api-docs.clearbooks.co.uk/
  - type: Authentication
    url: https://oauth-helper.clearbooks.co.uk/
common:
- type: DomainSecurity
  url: security/clearbooks-domain-security.yml
- type: Website
  url: https://www.clearbooks.co.uk/
- type: Documentation
  url: https://api-docs.clearbooks.co.uk/
- type: GitHubOrg
  url: https://github.com/clearbooks
- type: LinkedIn
  url: https://www.linkedin.com/company/clear-books
- type: Blog
  url: https://www.clearbooks.co.uk/blog/
- type: Pricing
  url: https://www.clearbooks.co.uk/pricing/
- type: StatusPage
  url: https://status.clearbooks.co.uk/
- type: X
  url: https://twitter.com/ClearBooks
- type: Plans
  url: plans/clearbooks-plans-pricing.yml
- type: RateLimits
  url: rate-limits/clearbooks-rate-limits.yml
- type: FinOps
  url: finops/clearbooks-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Clear Books API — frequently asked questions

Does Clear Books have an API?

Yes. APIs.io lists 1 API from Clear Books, including Clear Books REST API.

How do I authenticate with the Clear Books API?

Clear Books uses bearer-token authentication.

How much does the Clear Books API cost?

APIs.io lists 8 pricing plans for Clear Books, with each plan's price, limits and inclusions under Pricing on this page.

Is the Clear Books API ready for AI agents?

Clear Books has a Kin Score of 21.5 out of 100 (emerging) and an Agent Readiness score of 3.1 (human-only), scored by API Evangelist on 2026-11-06.

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