Zillow Group Authentication

generated: '2026-08-28'
method: searched
source: https://www.zillowgroup.com/developers/
description: >-
  Authentication profile for the Zillow Group API surface, read from the per-API fact panels
  Zillow Group publishes on its own developer portal. There is no single Zillow Group auth
  model: the portal is a directory over four separately-operated platforms, each with its own
  scheme. No securityScheme could be derived from a specification, because Zillow Group
  publishes no OpenAPI, Swagger, GraphQL SDL or AsyncAPI document on any host.
derived_from_spec: false
schemes:
  - id: bridge-bearer-token
    type: http
    scheme: bearer
    label: Bridge access token (server token)
    applies_to:
      - Zestimate API
      - Public Records API
      - MLS Listings API
      - Reviews API
      - Zillow Agent Reviews API
    docs: https://bridgedataoutput.com/docs/platform
    evidence: >-
      Zillow Group's own API pages state "Password and access token authentication" and route
      access-token issuance to the Bridge dashboard: "Your access tokens can also be found on
      your Bridge Dashboard under Data Access > API Access Tokens."
    onboarding: >-
      Register at https://bridgedataoutput.com/register, then API Access > Request Data Access
      > Zillow Group Datasets > agree to the Zillow Data Terms of Use > apply for the dataset.
    note: >-
      Served by Bridge Interactive, a Zillow Group company; Zillow Group's own developer portal
      names bridgedataoutput.com as the reference for these APIs, which is why a different
      domain appears here.
  - id: mortech-license-key
    type: apiKey
    in: body
    label: Third Party Name + License Key
    applies_to:
      - Rate Cloud API
      - Prospect Sync API
      - Prospect Trigger API
      - Lead Posting API
      - LOS Plug-In Integration API
    docs: https://www.zillowgroup.com/developers/mortgage/
    evidence: >-
      Every Mortech-powered mortgage API page publishes the same authentication value,
      "Third Party Name, License Key", with HTTP POST requests and XML responses.
    onboarding: Request-access form; agreement type is "Partner/MSA".
  - id: dotloop-oauth2
    type: oauth2
    label: OAuth 2.0 three-legged authorization code
    applies_to:
      - Transaction Management API
    docs: https://dotloop.github.io/public-api/
    authorization_url: https://auth.dotloop.com/oauth/authorize
    token_url: https://auth.dotloop.com/oauth/token
    revocation_url: https://auth.dotloop.com/oauth/token/revoke
    token_lifetime: 12 hours (refresh token required thereafter)
    bearer_header: 'Authorization: Bearer <access token>'
    client_registration: http://info.dotloop.com/developers
    evidence: >-
      Zillow Group's Transaction Management page states "OAuth 2.0 / 3-legged OAuth"; the
      linked dotloop Public API v2 guide documents the authorize/token/revoke endpoints and a
      Basic-auth client credential on the /token call.
    note: >-
      Served by dotloop, a Zillow Group company, and profiled in depth in its own repo
      (all/dotloop). Recorded here because Zillow Group lists it as one of its own developer
      APIs at https://www.zillowgroup.com/developers/api/transactions/transaction-management/.
  - id: rentals-webhook-callback
    type: none
    label: No inbound authentication documented
    applies_to:
      - Rentals Lead API
    docs: https://s3.amazonaws.com/files.hotpads.com/+guides/Lead+API+Guide.pdf
    evidence: >-
      The Lead API delivers URL-encoded HTTP POST callbacks to a customer-supplied webhook
      endpoint. Zillow Group's page documents no signing, shared secret or mutual TLS for
      those callbacks, and states "we are unable to make changes to our API fields or form".
    gap: true
unauthenticated_surfaces:
  - name: Zillow Research data (Real Estate Metrics, Neighborhood Data)
    url: https://www.zillow.com/research/data/
    style: CSV download, no key
    note: Free for public use; a download portal rather than a keyed API.
gaps:
  - No OAuth scope reference is published at the Zillow Group level; only the dotloop subsidiary documents scopes.
  - No API key rotation, expiry or revocation policy is published for the Bridge or Mortech schemes.
  - Rentals Lead API webhook deliveries carry no documented signature, so a receiver cannot verify origin.
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com