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Alto (Vebra / Zoopla)

Alto — formerly Vebra Alto, and still trading through vebra.com — is the United Kingdom's most widely deployed estate agency CRM, used by more than 6,000 sales and lettings agency branches to run valuations, listings, applicant matching, offers, sales and lettings progression, tenancies, property management, work orders and client accounting. It is owned by Houseful Limited, the parent of the Zoopla portal, which places Alto at the exact chokepoint of the UK residential market — the country has no MLS, so listings reach Rightmove and Zoopla through agency CRM software rather than a shared cooperative database, and Alto is the largest of those pipes. Its API posture is genuinely strong on the contract side and closed on the access side: Alto publishes an open, unauthenticated developer portal at developers.vebraalto.com carrying a complete OpenAPI 3.0.4 document (95 paths, 112 operations across 27 resource families) served verbatim from api-docs.vebraalto.com, alongside 26 documented CloudEvents 1.0 webhook event types and 101 published OAuth scope strings. But credentials are partner-only — a developer must register an integration in Alto Connect, be bound by an existing contract with Vebra Solutions, and then wait for an individual agency to activate the integration and issue an AgencyRef before a single call can be made. Sibling Zoopla portal product APIs (Leads, Premium Listing Activations, Weekly Featured Property) are documented publicly at developers.zoopla.co.uk with downloadable specs but are likewise restricted to contracted Zoopla agency customers. There is no SDK, CLI, Postman collection, MCP server or status page anywhere in the estate, and no RESO Web API or Data Dictionary certification exists — RESO is a North American NAR-driven standard with no UK counterpart. Alto publishes no open data; the UK's open property layer sits with HM Land Registry and Ordnance Survey, not with the private CRM duopoly feeders.

agent ready

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.

Kin Score
travel_explore apis.io index code GitHub sourcepublic Website

API Evangelist profiles Alto (Vebra / Zoopla) the way a machine reads it — 40 machine-readable artifacts across 4 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 — Alto (Vebra / Zoopla) scores 45.8/100 (developing), with a separate agent-readiness read of 42/100 (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 Kin Score How this is scored →
scored 2026-09-10 · rubric v0.20.0
Composite quality — 45.8/100 · developing
Contract Quality 13.9 / 25
Developer Ergonomics 13.2 / 20
Access Clarity 6.8 / 20
Operational Transparency 4.8 / 13
Contract Governance 0.5 / 12
Discoverability 7.2 / 10
Agent readiness — 42/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract derived 2.5 / 10
Documented Reversibility documented 2.4 / 6
MCP Server 0 / 12
Machine-Readable Auth served 9.0 / 10
Idempotency 0 / 9
Stable Error Semantics 8.0 / 8
Request/Response Examples partial 3.5 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface derived 1.5 / 6
Agent Skills derived 1.3 / 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 6.0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 6 / 6
Agentic Commerce Well-Known Document 0 / 5
Alto (Vebra / Zoopla) Kin Score — API readiness rating by API Evangelist

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How we profile Alto (Vebra / Zoopla)

Each block below is one kind of artifact we hold for Alto (Vebra / Zoopla). 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 29

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.

Alto (Vebra / Zoopla) Appointments API

The Appointments API from Alto (Vebra / Zoopla) — 7 operation(s) for appointments.

Alto (Vebra / Zoopla) Appraisals API

The Appraisals API from Alto (Vebra / Zoopla) — 2 operation(s) for appraisals.

Alto (Vebra / Zoopla) Branches API

The Branches API from Alto (Vebra / Zoopla) — 2 operation(s) for branches.

Alto (Vebra / Zoopla) Charges API

The Charges API from Alto (Vebra / Zoopla) — 2 operation(s) for charges.

Alto (Vebra / Zoopla) Clients API

The Clients API from Alto (Vebra / Zoopla) — 1 operation(s) for clients.

Alto (Vebra / Zoopla) Contacts API

The Contacts API from Alto (Vebra / Zoopla) — 13 operation(s) for contacts.

Alto (Vebra / Zoopla) Documents API

The Documents API from Alto (Vebra / Zoopla) — 5 operation(s) for documents.

Alto (Vebra / Zoopla) File Notes API

The FileNotes API from Alto (Vebra / Zoopla) — 4 operation(s) for filenotes.

Alto (Vebra / Zoopla) Inventory API

The Inventory API from Alto (Vebra / Zoopla) — 10 operation(s) for inventory.

Alto (Vebra / Zoopla) Landlords API

The Landlords API from Alto (Vebra / Zoopla) — 2 operation(s) for landlords.

Alto (Vebra / Zoopla) Leads API

The Leads API from Alto (Vebra / Zoopla) — 2 operation(s) for leads.

Alto (Vebra / Zoopla) Lettings Progression API

The LettingsProgression API from Alto (Vebra / Zoopla) — 1 operation(s) for lettingsprogression.

Alto (Vebra / Zoopla) Listing API

The Listing API from Alto (Vebra / Zoopla) — 7 operation(s) for listing.

Alto (Vebra / Zoopla) Management Events API

The ManagementEvents API from Alto (Vebra / Zoopla) — 3 operation(s) for managementevents.

Alto (Vebra / Zoopla) Media API

The Media API from Alto (Vebra / Zoopla) — 3 operation(s) for media.

Alto (Vebra / Zoopla) Negotiators API

The Negotiators API from Alto (Vebra / Zoopla) — 2 operation(s) for negotiators.

Alto (Vebra / Zoopla) Offers API

The Offers API from Alto (Vebra / Zoopla) — 1 operation(s) for offers.

Alto (Vebra / Zoopla) Owners API

The Owners API from Alto (Vebra / Zoopla) — 1 operation(s) for owners.

Alto (Vebra / Zoopla) Parameters API

The Parameters API from Alto (Vebra / Zoopla) — 6 operation(s) for parameters.

Alto (Vebra / Zoopla) Partners API

The Partners API from Alto (Vebra / Zoopla) — 3 operation(s) for partners.

Alto (Vebra / Zoopla) Products API

The Products API from Alto (Vebra / Zoopla) — 4 operation(s) for products.

Alto (Vebra / Zoopla) Reference Checks API

The ReferenceChecks API from Alto (Vebra / Zoopla) — 2 operation(s) for referencechecks.

Alto (Vebra / Zoopla) Referral API

The Referral API from Alto (Vebra / Zoopla) — 1 operation(s) for referral.

Alto (Vebra / Zoopla) Referrals API

The Referrals API from Alto (Vebra / Zoopla) — 1 operation(s) for referrals.

Alto (Vebra / Zoopla) REST Endpoints API

The REST Endpoints API from Alto (Vebra / Zoopla) — 2 operation(s) for rest endpoints.

Alto (Vebra / Zoopla) Sales Progression API

The SalesProgression API from Alto (Vebra / Zoopla) — 2 operation(s) for salesprogression.

Alto (Vebra / Zoopla) Suppliers API

The Suppliers API from Alto (Vebra / Zoopla) — 3 operation(s) for suppliers.

Alto (Vebra / Zoopla) Tenancies API

The Tenancies API from Alto (Vebra / Zoopla) — 6 operation(s) for tenancies.

Alto (Vebra / Zoopla) Work Orders API

The WorkOrders API from Alto (Vebra / Zoopla) — 3 operation(s) for workorders.

Scroll within the panel for all 29 ·

Open Collections 4

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).

Alto API

OPEN COLLECTION

Leads API

OPEN COLLECTION

Premium Listing activations

OPEN COLLECTION

Weekly Featured Property (WFP) Activations

OPEN COLLECTION

Event Specifications 2

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.

Alto Webhooks

Event notifications Alto delivers to a partner-hosted HTTPS endpoint when data changes in an Alto agency tenancy. Faithfully transcribed by API Evangelist from the webhook catal...

ASYNCAPI

Zoopla Lead Push Service

Real-time delivery of Zoopla portal leads to a partner-hosted endpoint. Faithfully transcribed by API Evangelist from the push-service documentation Zoopla publishes at https://...

ASYNCAPI

Security Posture 3

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.

Alto Vebra Authentication

apiKey/oauth2 · 5 schemes

SECURITY

Alto Vebra Domain Security

TLSv1.2 · HSTS · DMARC

SECURITY

Alto Vebra Vulnerability Disclosure

Hackerone · security.txt · contact published

SECURITY

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.

Alto Vebra Scopes

104 scopes · clientCredentials

104 scopes

SCOPES

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.

Alto Vebra Agentic Access

121 operations · 48 acting

121 operations · 48 acting

AGENTIC

Resources

Every other property we hold for Alto (Vebra / Zoopla) — 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 6

Portal, sign-up, and the first successful call

Portal
Portal
 Sandbox
Sandbox
 DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
Login

Documentation 3

Reference material describing how the API behaves

Documentation
Documentation
 AsyncAPI
AsyncAPI
 APIReference
APIReference

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 WellKnown
WellKnown
 X-MCPServerCandidate
X-MCPServerCandidate
 LLMsTxt
LLMsTxt
 LLMsTxt
LLMsTxt
 AgentSkill
AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conventions
Conventions
 DataModel
DataModel
 Webhooks
Webhooks

Scroll within the panel for all 7 ·

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 GitHubOrganization
GitHubOrganization
 Packages
Packages
 ToolCrosswalk
ToolCrosswalk

Access & Security 6

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 OAuthScopes
OAuthScopes
 Authentication
Authentication
 SecurityTxt
SecurityTxt
 VulnerabilityDisclosure
VulnerabilityDisclosure
 Security
Security

Operate 4

Status, limits, changes, and where to get help

Support
Support
 ChangeLog
ChangeLog
 Support
Support
 HelpCenter
HelpCenter

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 TermsOfService
TermsOfService

Company 3

The organization behind the API

Website
Website
 Blog
Blog
 BlogRSS
BlogRSS

Other 6

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap
 Overlay
Overlay
 Overlay
Overlay
 Overlay
Overlay
 Overlay
Overlay
 OpenIDConnect
OpenIDConnect

← All providers · Data indexed from github.com/api-evangelist/alto-vebra · machine-readable index on apis.io

Where this information came from

This is an independent, third-party profile of Alto (Vebra / Zoopla), 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.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.