Zenlist

Zenlist is a collaborative home-search platform for real estate agents and their clients, with MLS-level search on MLS inventory, in-app chat, listing notes, showing requests and itineraries across Mac, Windows, iOS and Android apps, and enterprise offerings for brokerages, teams and MLSs (for example the SFAR MLS mobile app). It contributes open-source RESO tooling on GitHub, including a Rust implementation of RESO RCP-19 RETS validation expressions with compliance tests, and runs a public Rules Playground (rules.zenlist.dev) for listing validation rules. Zenlist publishes no public API, developer documentation or machine-readable contract.

Zenlist is profiled on the APIs.io network. Tagged areas include Company, Real Estate, Home Search, MLS, and RESO.

Zenlist’s developer surface includes documentation, tooling, support, engineering blog, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

11.6/100 emerging ▼ -6.1 Agent 0/100 human only Heartbeat 18/100 slowing Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs

Company Real Estate Home Search MLS RESOBrokerage Software

Kin Score

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

Composite quality — 11.6/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 1.4 / 17

Access Clarity 2.9 / 17

Operational Transparency 1.5 / 11

Contract Governance 0.0 / 10

Discoverability 4.8 / 9

Regulatory Posture 1.5 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 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

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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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

13 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 8.3 — up to +18.3 composite points
Access Clarity scores 17.1 — up to +16.6 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/zenlist/apis.yml: open an issue on github.com/api-evangelist/zenlist 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 →

Security Posture 1

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

Zenlist Domain Security

TLSv1.2 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Build 3

SDKs, sample code, and the tooling you integrate with

IntegrationEdges

IntegrationEdges

GitHubOrganization

GitHubOrganization

Tools

Tools

Access & Security 2

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 4

The organization behind the API

Website

Blog

Newsroom

Partner

Other 2

Properties that don't map to a standard resource type

Vendors

Vendors

Hosts

Hosts

Source (apis.yml)

aid: zenlist
name: Zenlist
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: none
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://21517349.fs1.hubspotusercontent-na1.net/hubfs/21517349/Images%20for%20website/ZenlistBannerBig.jpg
description: Zenlist is a collaborative home-search platform for real estate agents and their clients, with MLS-level search
  on MLS inventory, in-app chat, listing notes, showing requests and itineraries across Mac, Windows, iOS and Android apps,
  and enterprise offerings for brokerages, teams and MLSs (for example the SFAR MLS mobile app). It contributes open-source
  RESO tooling on GitHub, including a Rust implementation of RESO RCP-19 RETS validation expressions with compliance tests,
  and runs a public Rules Playground (rules.zenlist.dev) for listing validation rules. Zenlist publishes no public API, developer
  documentation or machine-readable contract.
url: https://raw.githubusercontent.com/api-evangelist/zenlist/refs/heads/main/apis.yml
x-type: company
x-source: harvest:gap-automotive-real-estate
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-13 (local-v5; was harvest)
specificationVersion: '0.20'
created: '2026-10-13'
modified: '2026-10-13'
tags:
- Company
- Real Estate
- Home Search
- MLS
- RESO
- Brokerage Software
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Vendors
  url: vendors/zenlist-vendors.yml
- type: LLMsTxt
  url: llms/zenlist-llms.txt
- type: SecurityTxt
  url: well-known/zenlist-help-security.txt
- type: WellKnown
  url: well-known/zenlist-well-known.yml
- type: Hosts
  url: hosts/zenlist-hosts.yml
- type: IntegrationEdges
  url: integrations/zenlist-integration-edges.yml
- type: Documentation
  url: https://help.zenlist.com/
- type: DomainSecurity
  url: security/zenlist-domain-security.yml
- type: Website
  url: https://zenlist.com/
- type: GitHubOrganization
  url: https://github.com/zenlist
- type: Tools
  url: https://rules.zenlist.dev/
- type: Login
  url: https://zenlist.com/app/sign-in
- type: Support
  url: https://help.zenlist.com/en/
- type: Blog
  url: https://blog.zenlist.com
- type: Newsroom
  url: https://enterprise.zenlist.com/press
- type: Partner
  url: https://enterprise.zenlist.com/for-mlss
- type: TermsOfService
  url: https://zenlist.com/terms
- type: PrivacyPolicy
  url: https://zenlist.com/privacy
apis: []
x-coverage:
  state: none
  reason: no-developer-program
  method: derived
  generated: '2026-10-13'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company publishes no developer documentation host and no machine-readable contract on its own domain
  evidence:
  - url: https://blog.zenlist.com/mcp
    status: 403
  - url: https://zenlist.com/
    status: 200
x-enrichment:
  status: enriched
  pass: local-v5
  date: '2026-10-13'

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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