FreeAgent

FreeAgent is UK-focused cloud accounting software for small businesses, freelancers, and accountants, providing invoicing, expense tracking, time tracking, project management, banking, payroll, and Self Assessment / VAT filing through HMRC's Making Tax Digital. The FreeAgent API is a RESTful service that exposes contacts, invoices, estimates, expenses, bills, timeslips, projects, bank accounts, bank transactions, transaction explanations, and tax timeline events for company accounts and accountancy practices. Authentication uses OAuth 2.0 (authorization code flow) and responses are available in JSON or XML.

FreeAgent publishes 4 APIs on the APIs.io network, including REST API, BankAccounts API, Contacts API, and 1 more. Tagged areas include Accounting, Small Business, Invoicing, Bookkeeping, and Expenses.

FreeAgent’s developer surface includes authentication, documentation, pricing, signup flow, support, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

31.9/100 thin ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessSelf serve

4 APIs

AccountingSmall BusinessInvoicingBookkeepingExpensesPayrollVATHMRCMaking Tax Digital

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 31.9/100 · thin

Contract Quality 13.4 / 25

Developer Ergonomics 7.0 / 20

Commercial Clarity 2.1 / 20

Operational Transparency 2.1 / 13

Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

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 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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/freeagent: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 4

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

Scopes 1

OAuth scopes governing access to this provider's APIs.

Freeagent Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Signup

Signup

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 4

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

Operate 2

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Commercial 1

Pricing, plans, and the legal terms of use

Pricing

Pricing

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: freeagent
name: FreeAgent
description: FreeAgent is UK-focused cloud accounting software for small businesses, freelancers, and accountants, providing
  invoicing, expense tracking, time tracking, project management, banking, payroll, and Self Assessment / VAT filing through
  HMRC's Making Tax Digital. The FreeAgent API is a RESTful service that exposes contacts, invoices, estimates, expenses,
  bills, timeslips, projects, bank accounts, bank transactions, transaction explanations, and tax timeline events for company
  accounts and accountancy practices. Authentication uses OAuth 2.0 (authorization code flow) and responses are available
  in JSON or XML.
type: Index
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/freeagent.png
tags:
- Accounting
- Small Business
- Invoicing
- Bookkeeping
- Expenses
- Payroll
- VAT
- HMRC
- Making Tax Digital
url: https://raw.githubusercontent.com/api-evangelist/freeagent/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.19'
apis:
- aid: freeagent:rest-api
  name: FreeAgent REST API
  description: RESTful API for the FreeAgent cloud accounting platform. Provides full access to invoices, estimates, contacts,
    bills, expenses, projects, timeslips, bank accounts, transactions, and accountancy-practice resources. Authentication
    is OAuth 2.0 authorization code flow; a sandbox is available at api.sandbox.freeagent.com.
  humanURL: https://dev.freeagent.com/docs
  baseURL: https://api.freeagent.com/v2
  tags:
  - Accounting
  - Invoicing
  - Bookkeeping
  - Expenses
  - Bank Feeds
  - OAuth 2.0
  properties:
  - type: Documentation
    url: https://dev.freeagent.com/docs
  - type: Authentication
    url: https://dev.freeagent.com/docs/oauth
  - type: GettingStarted
    url: https://dev.freeagent.com/docs/quick_start
  - type: Sandbox
    url: https://api.sandbox.freeagent.com
  - type: PostmanCollection
    url: https://github.com/fac/postman-freeagent-api-collection
- aid: freeagent:freeagent-bankaccounts-api
  name: FreeAgent BankAccounts API
  description: The BankAccounts API from FreeAgent — 2 operation(s) for bankaccounts.
  humanURL: https://dev.freeagent.com/docs
  baseURL: https://api.freeagent.com/v2
  tags:
  - BankAccounts
  properties:
  - type: OpenAPI
    url: openapi/freeagent-bankaccounts-api-openapi.yml
- aid: freeagent:freeagent-contacts-api
  name: FreeAgent Contacts API
  description: The Contacts API from FreeAgent — 2 operation(s) for contacts.
  humanURL: https://dev.freeagent.com/docs
  baseURL: https://api.freeagent.com/v2
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/freeagent-contacts-api-openapi.yml
- aid: freeagent:freeagent-invoices-api
  name: FreeAgent Invoices API
  description: The Invoices API from FreeAgent — 10 operation(s) for invoices.
  humanURL: https://dev.freeagent.com/docs
  baseURL: https://api.freeagent.com/v2
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/freeagent-invoices-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/freeagent-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/freeagent-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/freeagent-domain-security.yml
- type: Authentication
  url: authentication/freeagent-authentication.yml
- type: OAuthScopes
  url: scopes/freeagent-scopes.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/freeagent
- type: Website
  url: https://www.freeagent.com
- type: Documentation
  url: https://dev.freeagent.com/docs
- type: DeveloperPortal
  url: https://dev.freeagent.com
- type: Pricing
  url: https://www.freeagent.com/pricing/
- type: Signup
  url: https://signup.freeagent.com/
- type: Support
  url: https://support.freeagent.com
- type: StatusPage
  url: https://status.freeagent.com
- url: https://www.freeagent.com/feed.rss
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

FreeAgent

Kin Score

APIs 4

FreeAgent REST API

FreeAgent BankAccounts API

FreeAgent Contacts API

FreeAgent Invoices API

Open Collections 1

FreeAgent API

Security Posture 3

Freeagent Authentication

Freeagent Domain Security

Freeagent Vulnerability Disclosure