Quardlyn Developers

Build property software that connects directly with Quardlyn.

Synchronise properties through the production CRM API, manage listings, upload media, track lifecycle changes and test outbound webhook simulations in sandbox. Available in minutes.

Latest API Version
v1.0
API Status
Operational
Supported
Property CRM integrations
Changelog
CRM API v1 public baseline

The OpenAPI files are the source contract for request schemas, responses, errors and supported operations.

openapi: 3.0.3
info:
  title: Quardlyn CRM API
  version: v1
  description: >
    Public CRM API contract for third-party property CRM integrations.
    Version v1 is STABLE (API Contract Frozen) as of 2026-07-03. Developers
    can build against v1, new backward-compatible features may be added, and
    no public API contract changes may be made to v1 unless they are backward
    compatible or approved as a breaking v2 change.
servers:
  - url: https://{host}/api/v1/crm
    variables:
      host:
        default: example.quardlyn.test
security:
  - CrmKey: []
    CrmTimestamp: []
    CrmNonce: []
    CrmSignature: []
  - OAuthBearer: []
tags:
  - name: Metadata
  - name: Properties
  - name: Sandbox
paths:
  /health:
    get:
      tags: [Metadata]
      summary: Check CRM API availability
      security: []
      responses:
        '200':
          description: API health
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HealthResponse'
  /capabilities:
    get:
      tags: [Metadata]
      summary: Return public CRM API capabilities
      security: []
      responses:
        '200':
          description: Public capabilities
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CapabilitiesResponse'
  /version:
    get:
      tags: [Metadata]
      summary: Return public CRM API version metadata
      security: []
      responses:
        '200':
          description: Version metadata
          content:
            application/json: