Landmark Information Group
Landmark Information Group is a United Kingdom property and land data business, part of Daily Mail and General Trust (DMGT), that sits in the middle of the UK residential and commercial property transaction rather than at the listing end of it. Founded in 1995 and headquartered in Exeter, it aggregates 700+ datasets from nearly 400 suppliers — Ordnance Survey mapping and AddressBase/UPRN addressing, environmental and flood and mining risk, historical maps, planning applications, and Barbour ABI project data — and sells them as conveyancing search reports (SearchFlow, Envirocheck, RiskView, SiteSolutions), estate agency compliance and material information products (LandmarkAgent, Metropix floor plans), case management software for property lawyers (Optimus, Intelliworks, Ochresoft, Vantage), and lender/surveyor valuation infrastructure (Secure Panel Network SPN and SPN+, Q-Guard). The UK has no MLS and no RESO equivalent — residential listings are controlled by the Rightmove/Zoopla duopoly and reached through agency CRMs — so Landmark is not a listings company; it is the transaction-data and workflow layer beneath conveyancers, lenders, surveyors, and agents. Its API posture is unusually honest for this sector: Landmark runs a genuinely public, un-gated API documentation portal at landmarkcloudservices.com that publishes full OpenAPI 3.x contracts for its Compliance/Order, Conveyancing, Intelliworks, Document Vault, and Milestone Notification APIs, plus a public HTML technical pack for the Barbour ABI-powered Planning API. Reading the contracts is open to anyone; calling them is not. Every API is OAuth 2.0 client-credentials against Landmark's Auth0 tenant with a client ID and secret issued only after a commercial account is onboarded ("your Landmark contact will confirm what's available to you"), and the Planning API requires a paid subscription or pay-as-you-go agreement plus an API key issued by Landmark. There is no RESO Web API certification, no RESO Data Dictionary posture, no OData $metadata document and no Universal Property Identifier anywhere in Landmark's surface — RESO is a North American MLS construct and is simply absent from the UK market. Landmark publishes no open data of its own; the open UK property layer belongs to HM Land Registry and Ordnance Survey, both of which are Landmark suppliers rather than Landmark products.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Landmark Information Group the way a machine reads it — 25 machine-readable artifacts across 5 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Landmark Information Group scores 51.2/100 (developing), with a separate agent-readiness read of 46/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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How we profile Landmark Information Group
Each block below is one kind of artifact we hold for Landmark Information Group. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 10
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Landmark Planning API (powered by Barbour ABI)
RESTful planning-application data API combining Barbour ABI project information with Landmark geospatial data, covering UK and Republic of Ireland planning applications from 1 J...
Landmark Geodata Web Map Tile Service (WMTS)
On-demand raster mapping tile service delivered against the Open Geospatial Consortium Web Map Tile Service (OGC WMTS) standard, with 20 zoom levels spanning Ordnance Survey Mas...
Landmark Information Group Activities API
Read a vault's audit history.
Landmark Information Group Cases API
Once you instruct a quote it becomes a case. If you're the conveyancer, these are the cases assigned to you: you work them through to completion and post updates as you go. If y...
Landmark Information Group Document Vaults API
Create a vault and manage its details and recipients.
Landmark Information Group Documents API
Add and remove the files held in a vault.
Landmark Information Group Milestones API
Operations to manage callback configurations for transaction milestone notifications
Landmark Information Group Order Experience API
Operations to create and receive order results.
Landmark Information Group Quotes API
Quotes are where a job begins. You build a quote for your client's transaction, get back the panel conveyancers available to you with their pricing, and instruct one of them to ...
Landmark Information Group Transaction Requests API
APIs for tracking asynchronous request status
Scroll within the panel for all 10 ·
Open Collections 5
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Landmark Conveyancing Experience API
OPEN COLLECTIONDocument Vault API
OPEN COLLECTIONIntelliworks APIs
OPEN COLLECTIONMilestone Notification Service API
OPEN COLLECTIONOrder Experience API
OPEN COLLECTIONArazzo Workflows 4
Real integrations are rarely a single call. Arazzo describes the multi-step sequences — auth, then create, then confirm — so both a human and an agent can follow the choreography, not just the endpoints.
Multi-step API workflows described with the Arazzo specification.
Assemble a Contract Pack Vault
Create a Document Vault, add a document, set the recipient organisation and a recipient, and read back the vault and its activity trail.
ARAZZOOrder a Landmark compliance check and collect the result
Place a compliance product order, poll it to completion, read the result and download the result document.
ARAZZOQuote to conveyancing instruction
Create a conveyancing quote, complete it with a person, property address and product details, produce the quote PDF and instruct a panel conveyancer.
ARAZZOSubscribe to valuation milestone notifications
Register a callback endpoint for Secure Panel Network valuation milestones, update its configuration, then remove it.
ARAZZORate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Landmark Information Rate Limits
RATE LIMITSEvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Landmark Information Webhooks
ASYNCAPISecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Landmark Information Group — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 4
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 10
MCP servers, agent skills, and machine-readable catalogs
Scroll within the panel for all 10 ·
Design & Contract 7
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 7 ·
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 4
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 6
The organization behind the API
Other 6
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/landmark-information · machine-readable index on apis.io
This is an independent, third-party profile of Landmark Information Group, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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