Arthur Online

Arthur Online is a London-headquartered UK property management software platform, founded in 2008 and acquired by Aareon in January 2021, that gives letting agents, self-managing landlords, block and social housing managers, and student accommodation operators a cloud system of record for properties, units, tenancies, tenants, applicants, viewings, maintenance work orders, certificates, utilities and rental financials, with companion mobile apps for managers, tenants, contractors and owners. It sits in the middle of the UK residential lettings value chain: it is the agency-side operational system that pushes stock out to the Rightmove and Zoopla portals and pulls accounting into Xero and QuickBooks, rather than a listings marketplace or a data cooperative. Its API posture is unusually open for the sector but is not open data: the full Arthur API v2 reference is published without a login as a public Postman collection at developer.arthuronline.co.uk covering 324 documented requests across 16 resource areas, yet every call is tenant-scoped OAuth 2.0 Authorization Code plus an X-EntityID header, credentials are issued only from inside a paying Arthur account after contacting Arthur support, and no data is readable anonymously. There is no RESO posture at all — the United Kingdom has no MLS, no NAR, and no RESO Data Dictionary or Web API certification regime, so listings interoperability here is portal-to-CRM feeds rather than a certified machine-readable standard.

Arthur Online publishes 32 APIs on the APIs.io network, including Applicant API, Applicants API, Assets API, and 29 more. Tagged areas include Real-Estate, United Kingdom, Property Management, PropTech, and Rentals.

The Arthur Online catalog on APIs.io includes 2 event-driven AsyncAPI specifications.

Arthur Online’s developer surface includes authentication, developer portal, documentation, API reference, signup flow, support, engineering blog, and 48 more developer resources.

🌐 Visit website 📡 Source on GitHub

47.9/100 developing ▬ flat Agent 38/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessPaidSelf serve

32 APIs

Real-Estate United Kingdom Property Management PropTech Rentals Lettings Tenancy Maintenance Property ListingsSocial HousingStudent HousingBlock Management

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 47.9/100 · developing

Contract Quality 5.2 / 19

Developer Ergonomics 9.6 / 15

Access Clarity 11.4 / 15

Operational Transparency 3.1 / 10

Contract Governance 0.7 / 9

Discoverability 4.3 / 8

Regulatory Posture 6.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 38/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 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 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Education & Research 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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 github.com/api-evangelist/arthur-online: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 32

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

Arthur Online Applicant API

The Applicant API from Arthur Online — 5 operation(s) for applicant.

Arthur Online Applicants API

The Applicants API from Arthur Online — 4 operation(s) for applicants.

Arthur Online Assets API

The Assets API from Arthur Online — 7 operation(s) for assets.

Arthur Online Assigned Managers API

The Assigned Managers API from Arthur Online — 4 operation(s) for assigned managers.

Arthur Online Certificates API

The Certificates API from Arthur Online — 5 operation(s) for certificates.

Arthur Online Contractor Invoices API

The Contractor Invoices API from Arthur Online — 2 operation(s) for contractor invoices.

Arthur Online Conversations API

The Conversations API from Arthur Online — 11 operation(s) for conversations.

Arthur Online Credit Checks API

The Credit Checks API from Arthur Online — 1 operation(s) for credit checks.

Arthur Online Entities API

The Entities API from Arthur Online — 2 operation(s) for entities.

Arthur Online General Information API

The General Information API from Arthur Online — 2 operation(s) for general information.

Arthur Online Invite API

The Invite API from Arthur Online — 1 operation(s) for invite.

Arthur Online Messages API

The Messages API from Arthur Online — 2 operation(s) for messages.

Arthur Online Notes API

The Notes API from Arthur Online — 12 operation(s) for notes.

Arthur Online Offers API

The Offers API from Arthur Online — 1 operation(s) for offers.

Arthur Online Properties API

The Properties API from Arthur Online — 2 operation(s) for properties.

Arthur Online Property API

The Property API from Arthur Online — 1 operation(s) for property.

Arthur Online Quotes API

The Quotes API from Arthur Online — 2 operation(s) for quotes.

Arthur Online Readings API

The Readings API from Arthur Online — 2 operation(s) for readings.

Arthur Online Recurrings API

The Recurrings API from Arthur Online — 2 operation(s) for recurrings.

Arthur Online Register Deposit API

The Register Deposit API from Arthur Online — 1 operation(s) for register deposit.

Arthur Online Subtasks API

The Subtasks API from Arthur Online — 2 operation(s) for subtasks.

Arthur Online Tags API

The Tags API from Arthur Online — 21 operation(s) for tags.

Arthur Online Task API

The Task API from Arthur Online — 3 operation(s) for task.

Arthur Online Tasks API

The Tasks API from Arthur Online — 26 operation(s) for tasks.

Arthur Online Tenancies API

The Tenancies API from Arthur Online — 5 operation(s) for tenancies.

Arthur Online Tenants API

The Tenants API from Arthur Online — 3 operation(s) for tenants.

Arthur Online Transactions API

The Transactions API from Arthur Online — 6 operation(s) for transactions.

Arthur Online Types API

The Types API from Arthur Online — 31 operation(s) for types.

Arthur Online Units API

The Units API from Arthur Online — 3 operation(s) for units.

Arthur Online Utilities API

The Utilities API from Arthur Online — 4 operation(s) for utilities.

Arthur Online Viewings API

The Viewings API from Arthur Online — 5 operation(s) for viewings.

Arthur Online Workorders API

The Workorders API from Arthur Online — 29 operation(s) for workorders.

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Postman Collections 16

Ready-to-run Postman collections for exercising this provider's APIs.

Arthur Applicants API

POSTMAN

Arthur Assets API

POSTMAN

Arthur Certificates API

POSTMAN

Arthur Conversations API

POSTMAN

Arthur Entities API

POSTMAN

Arthur Financials API

POSTMAN

Arthur Maintenance API

POSTMAN

Arthur Notes API

POSTMAN

Arthur Properties API

POSTMAN

Arthur Tags API

POSTMAN

Arthur Tenancies API

POSTMAN

Arthur Tenants API

POSTMAN

Arthur Types API

POSTMAN

Arthur Units API

POSTMAN

Arthur Utilities API

POSTMAN

Arthur Viewings API

POSTMAN

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Open Collections 16

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Arthur Applicants API

OPEN COLLECTION

Arthur Assets API

OPEN COLLECTION

Arthur Certificates API

OPEN COLLECTION

Arthur Conversations API

OPEN COLLECTION

Arthur Entities API

OPEN COLLECTION

Arthur Financials API

OPEN COLLECTION

Arthur Maintenance API

OPEN COLLECTION

Arthur Notes API

OPEN COLLECTION

Arthur Properties API

OPEN COLLECTION

Arthur Tags API

OPEN COLLECTION

Arthur Tenancies API

OPEN COLLECTION

Arthur Tenants API

OPEN COLLECTION

Arthur Types API

OPEN COLLECTION

Arthur Units API

OPEN COLLECTION

Arthur Utilities API

OPEN COLLECTION

Arthur Viewings API

OPEN COLLECTION

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Arazzo Workflows 3

Multi-step API workflows described with the Arazzo specification.

Arthur Online - applicant to tenancy

The UK lettings funnel in Arthur Online: confirm the entity, create an applicant, book a viewing on a unit, record the offer, convert the viewing into a tenancy, add the tenant ...

ARAZZO

Arthur Online - maintenance dispatch

Raise a maintenance task against a property, break it into subtasks, dispatch it to a contractor as a work order, open the conversation and read back quotes and invoices. Approv...

ARAZZO

Arthur Online - onboard a property

Bring a new building into Arthur Online: create the property, add a lettable unit, file the compliance certificate, publish the information shared with occupants and attach the ...

ARAZZO

Pricing Plans 1

Published pricing tiers and plan structures.

Arthur Online Plans

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Arthur Online Rate Limits

1 limits

RATE LIMITS

Event Specifications 2

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

Arthur Online Webhooks

The Arthur Online webhook event surface. A property manager subscribes a webhook URL to one or more of the 125 published triggers on the Arthur webhook page; Arthur then POSTs a...

ASYNCAPI

Arthur Online Webhooks

ASYNCAPI

Security Posture 2

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

Arthur Online Authentication

oauth2 · 1 scheme

SECURITY

Arthur Online Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Arthur Online Agentic Access

317 operations · 137 acting

AGENTIC

Resources

Get Started 6

Portal, sign-up, and the first successful call

Portal

Signup

DeveloperPortal

GettingStarted

SignUp

Login

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

AsyncAPI

AsyncAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Vocabulary

Arazzo

Webhooks

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Build 7

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

PostmanCollection

PostmanCollection

Postman

Postman

GitHubOrganization

Packages

ToolCrosswalk

Examples

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Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

Support

Support

HelpCenter

HelpCenter

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

PrivacyPolicy

TermsOfService

Pricing

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 16

Properties that don't map to a standard resource type

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Scroll for all 16

Source (apis.yml)

aid: arthur-online
url: https://raw.githubusercontent.com/api-evangelist/arthur-online/refs/heads/main/apis.yml
name: Arthur Online
kind: company
description: 'Arthur Online is a London-headquartered UK property management software platform, founded in 2008 and acquired
  by Aareon in January 2021, that gives letting agents, self-managing landlords, block and social housing managers, and student
  accommodation operators a cloud system of record for properties, units, tenancies, tenants, applicants, viewings, maintenance
  work orders, certificates, utilities and rental financials, with companion mobile apps for managers, tenants, contractors
  and owners. It sits in the middle of the UK residential lettings value chain: it is the agency-side operational system that
  pushes stock out to the Rightmove and Zoopla portals and pulls accounting into Xero and QuickBooks, rather than a listings
  marketplace or a data cooperative. Its API posture is unusually open for the sector but is not open data: the full Arthur
  API v2 reference is published without a login as a public Postman collection at developer.arthuronline.co.uk covering 324
  documented requests across 16 resource areas, yet every call is tenant-scoped OAuth 2.0 Authorization Code plus an X-EntityID
  header, credentials are issued only from inside a paying Arthur account after contacting Arthur support, and no data is
  readable anonymously. There is no RESO posture at all — the United Kingdom has no MLS, no NAR, and no RESO Data Dictionary
  or Web API certification regime, so listings interoperability here is portal-to-CRM feeds rather than a certified machine-readable
  standard.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-09-02'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/arthur-online.png
tags:
- Real-Estate
- United Kingdom
- Property Management
- PropTech
- Rentals
- Lettings
- Tenancy
- Maintenance
- Property Listings
- Social Housing
- Student Housing
- Block Management
tags_raw:
- Real Estate
- United Kingdom
- Property Management
- PropTech
- Rentals
- Lettings
- Tenancy
- Maintenance
- Property Listings
- Social Housing
- Student Housing
- Block Management
created: '2026-07-26'
modified: '2026-07-26'
specificationVersion: '0.23'
apis:
- aid: arthur-online:arthur-online-applicant-api
  name: Arthur Online Applicant API
  description: The Applicant API from Arthur Online — 5 operation(s) for applicant.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Applicant
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-applicant-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-applicants-api
  name: Arthur Online Applicants API
  description: The Applicants API from Arthur Online — 4 operation(s) for applicants.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Applicants
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-applicants-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-assets-api
  name: Arthur Online Assets API
  description: The Assets API from Arthur Online — 7 operation(s) for assets.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Assets
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-assets-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-assigned-managers-api
  name: Arthur Online Assigned Managers API
  description: The Assigned Managers API from Arthur Online — 4 operation(s) for assigned managers.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Assigned Managers
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-assigned-managers-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-certificates-api
  name: Arthur Online Certificates API
  description: The Certificates API from Arthur Online — 5 operation(s) for certificates.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Certificates
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-certificates-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-contractor-invoices-api
  name: Arthur Online Contractor Invoices API
  description: The Contractor Invoices API from Arthur Online — 2 operation(s) for contractor invoices.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Contractor Invoices
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-contractor-invoices-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-conversations-api
  name: Arthur Online Conversations API
  description: The Conversations API from Arthur Online — 11 operation(s) for conversations.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Conversations
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-conversations-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-credit-checks-api
  name: Arthur Online Credit Checks API
  description: The Credit Checks API from Arthur Online — 1 operation(s) for credit checks.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Credit Checks
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-credit-checks-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-entities-api
  name: Arthur Online Entities API
  description: The Entities API from Arthur Online — 2 operation(s) for entities.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Entities
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-entities-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-general-information-api
  name: Arthur Online General Information API
  description: The General Information API from Arthur Online — 2 operation(s) for general information.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - General Information
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-general-information-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-invite-api
  name: Arthur Online Invite API
  description: The Invite API from Arthur Online — 1 operation(s) for invite.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - invite
  tags_raw:
  - Invite
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-invite-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-messages-api
  name: Arthur Online Messages API
  description: The Messages API from Arthur Online — 2 operation(s) for messages.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Message
  tags_raw:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-messages-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-notes-api
  name: Arthur Online Notes API
  description: The Notes API from Arthur Online — 12 operation(s) for notes.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Notes
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-notes-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-offers-api
  name: Arthur Online Offers API
  description: The Offers API from Arthur Online — 1 operation(s) for offers.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Offers
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-offers-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-properties-api
  name: Arthur Online Properties API
  description: The Properties API from Arthur Online — 2 operation(s) for properties.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Properties
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-properties-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-property-api
  name: Arthur Online Property API
  description: The Property API from Arthur Online — 1 operation(s) for property.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Property
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-property-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-quotes-api
  name: Arthur Online Quotes API
  description: The Quotes API from Arthur Online — 2 operation(s) for quotes.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Quotes
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-quotes-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-readings-api
  name: Arthur Online Readings API
  description: The Readings API from Arthur Online — 2 operation(s) for readings.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Readings
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-readings-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-recurrings-api
  name: Arthur Online Recurrings API
  description: The Recurrings API from Arthur Online — 2 operation(s) for recurrings.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Recurrings
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-recurrings-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-register-deposit-api
  name: Arthur Online Register Deposit API
  description: The Register Deposit API from Arthur Online — 1 operation(s) for register deposit.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Register Deposit
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-register-deposit-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-subtasks-api
  name: Arthur Online Subtasks API
  description: The Subtasks API from Arthur Online — 2 operation(s) for subtasks.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Subtasks
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-subtasks-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-tags-api
  name: Arthur Online Tags API
  description: The Tags API from Arthur Online — 21 operation(s) for tags.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Tags
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-tags-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-task-api
  name: Arthur Online Task API
  description: The Task API from Arthur Online — 3 operation(s) for task.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Task
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-task-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-tasks-api
  name: Arthur Online Tasks API
  description: The Tasks API from Arthur Online — 26 operation(s) for tasks.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Task
  tags_raw:
  - Tasks
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-tasks-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-tenancies-api
  name: Arthur Online Tenancies API
  description: The Tenancies API from Arthur Online — 5 operation(s) for tenancies.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Tenancies
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-tenancies-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-tenants-api
  name: Arthur Online Tenants API
  description: The Tenants API from Arthur Online — 3 operation(s) for tenants.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Tenants
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-tenants-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-transactions-api
  name: Arthur Online Transactions API
  description: The Transactions API from Arthur Online — 6 operation(s) for transactions.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Transaction
  tags_raw:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-transactions-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-types-api
  name: Arthur Online Types API
  description: The Types API from Arthur Online — 31 operation(s) for types.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Types
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-types-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-units-api
  name: Arthur Online Units API
  description: The Units API from Arthur Online — 3 operation(s) for units.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Units
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-units-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-utilities-api
  name: Arthur Online Utilities API
  description: The Utilities API from Arthur Online — 4 operation(s) for utilities.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Utilities
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-utilities-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-viewings-api
  name: Arthur Online Viewings API
  description: The Viewings API from Arthur Online — 5 operation(s) for viewings.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Viewings
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-viewings-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
- aid: arthur-online:arthur-online-workorders-api
  name: Arthur Online Workorders API
  description: The Workorders API from Arthur Online — 29 operation(s) for workorders.
  humanURL: https://developer.arthuronline.co.uk/
  baseURL: https://api.arthuronline.co.uk/v2
  tags:
  - Work Orders
  tags_raw:
  - Workorders
  properties:
  - type: OpenAPI
    url: openapi/arthur-online-workorders-api-openapi.yml
  - type: Documentation
    url: https://developer.arthuronline.co.uk/
  - type: APIReference
    url: https://developer.arthuronline.co.uk/
  - type: PostmanCollection
    url: collections/arthur-online.postman_collection.json
  - type: Authentication
    url: authentication/arthur-online-authentication.yml
  - type: Webhooks
    url: asyncapi/arthur-online-webhooks.yml
  - type: AsyncAPI
    url: asyncapi/arthur-online-webhooks-asyncapi.yml
common:
- type: Overlay
  url: overlays/arthur-online-properties-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-units-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-tenancies-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-tenants-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-applicants-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-viewings-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-maintenance-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-financials-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-assets-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-utilities-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-certificates-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-entities-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-conversations-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-tags-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-notes-overlay.yaml
- type: Overlay
  url: overlays/arthur-online-types-overlay.yaml
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/arthur-online/overview
- type: AgenticAccess
  url: agentic-access/arthur-online-agentic-access.yml
- type: DomainSecurity
  url: security/arthur-online-domain-security.yml
- type: Authentication
  url: authentication/arthur-online-authentication.yml
- type: Website
  url: https://www.arthuronline.co.uk/
- type: Portal
  url: https://developer.arthuronline.co.uk/
- type: Documentation
  url: https://developer.arthuronline.co.uk/
- type: APIReference
  url: https://developer.arthuronline.co.uk/
- type: PostmanCollection
  url: collections/arthur-online.postman_collection.json
- type: Signup
  url: https://www.arthuronline.co.uk/connect/arthur-api
- type: Support
  url: https://support.arthuronline.co.uk/
- type: Blog
  url: https://www.arthuronline.co.uk/arthur-insight/blog
- type: Integrations
  url: https://www.arthuronline.co.uk/connect/
- type: PrivacyPolicy
  url: https://www.arthuronline.co.uk/legal/privacy-policy
- type: TermsOfService
  url: https://www.arthuronline.co.uk/legal/terms-and-conditions
- type: DeveloperPortal
  url: https://developer.arthuronline.co.uk/
- type: GettingStarted
  url: https://www.arthuronline.co.uk/connect/arthur-api
- type: Postman
  url: https://documenter.getpostman.com/view/22554870/2s93sZ5YeM
- type: SignUp
  url: https://www.arthuronline.co.uk/connect/arthur-api
- type: Login
  url: https://login.arthuronline.co.uk/
- type: HelpCenter
  url: https://support.arthuronline.co.uk/support/solutions
- type: Pricing
  url: https://www.arthuronline.co.uk/pricing
- type: GitHubOrganization
  url: https://github.com/arthur-crm
- type: Conventions
  url: conventions/arthur-online-conventions.yml
- type: ErrorCatalog
  url: errors/arthur-online-problem-types.yml
- type: Lifecycle
  url: lifecycle/arthur-online-lifecycle.yml
- type: Conformance
  url: conformance/arthur-online-conformance.yml
- type: RateLimits
  url: rate-limits/arthur-online-rate-limits.yml
- type: Plans
  url: plans/arthur-online-plans.yml
- type: Packages
  url: packages/arthur-online-packages.yml
- type: DataModel
  url: data-model/arthur-online-data-model.yml
- type: Vocabulary
  url: vocabulary/arthur-online-vocabulary.yml
- type: LLMsTxt
  url: llms/arthur-online-llms.txt
- type: X-MCPServerCandidate
  url: mcp/arthur-online-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247)

# --- truncated at 32 KB (32 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/arthur-online/refs/heads/main/apis.yml

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