The APEX API

A fully documented RESTful API over HTTPS. Scoped API keys allow you to issue separate credentials for read-only access, write access, or specific resource types. Rate limiting is applied per key with configurable limits on Professional and Enterprise plans. All responses use consistent JSON envelopes with pagination, filtering, and sorting built in.

• ✓Scoped API keys per integration
• ✓Configurable rate limits
• ✓Cursor-based pagination
• ✓Field-level filtering
• ✓Idempotency keys on mutations

Subscribe to any combination of the 47 webhook events that cover the full APEX lifecycle. Payloads are signed with HMAC-SHA256 so you can verify authenticity at your endpoint. Failed deliveries are retried with exponential back-off over 24 hours. A webhook event log with full payload history is available in the APEX dashboard.

• ✓HMAC-SHA256 payload signing
• ✓Exponential back-off retries
• ✓24-hour delivery window
• ✓Full event log with replay
• ✓Per-endpoint secret rotation

Import assets, tenancy records, financial transactions, and compliance data in bulk via CSV or structured JSON. Ideal for migrating from spreadsheets or syncing data from legacy property management systems. Import jobs run asynchronously and report validation errors per row, so partial imports never silently fail.

• ✓CSV and JSON formats supported
• ✓Async import jobs
• ✓Per-row validation errors
• ✓Dry-run mode
• ✓Duplicate detection

Official TypeScript and Python SDKs are currently in development and will be released later in 2026. Both SDKs will provide fully typed request and response models, automatic pagination helpers, and built-in retry logic. In the meantime, the API is straightforward to consume with any HTTP client — our documentation includes examples in TypeScript, Python, and cURL.

• ✓TypeScript SDK (Q3 2026)
• ✓Python SDK (Q3 2026)
• ✓Typed request/response models
• ✓Pagination helpers
• ✓Retry logic built in

Clear, consistent, predictable responses.

Every APEX API resource follows a consistent JSON structure. Monetary values are returned as integers in pence — never floating point — to prevent rounding errors in financial calculations. Percentage values use basis points for the same reason.

All timestamps are in ISO 8601 format with UTC timezone. Pagination uses cursor tokens rather than page numbers, so results remain stable even as your data is updated between requests.

GET /v1/assets/ast_8xKp3mQz7nR2

HTTP/1.1 200 OK
Content-Type: application/json

{
  "id": "ast_8xKp3mQz7nR2",
  "object": "asset",
  "name": "14 Cavendish Court",
  "class": "residential",
  "sub_class": "btl_single",
  "status": "active",
  "address": {
    "line1": "14 Cavendish Court",
    "city": "Leeds",
    "county": "West Yorkshire",
    "postcode": "LS1 3DQ",
    "country": "GB"
  },
  "financials": {
    "acquisition_cost_p": 28500000,
    "current_valuation_p": 34200000,
    "gross_annual_rent_p": 1980000,
    "gross_yield_bps": 579,
    "net_yield_bps": 431,
    "outstanding_mortgage_p": 18200000,
    "ltv_bps": 5322
  },
  "tenancy": {
    "status": "let",
    "rent_frequency": "monthly",
    "rent_p": 165000,
    "lease_start": "2024-03-01",
    "lease_end": "2026-02-28",
    "next_rent_review": "2025-03-01",
    "arrears_p": 0
  },
  "compliance": {
    "epc_rating": "C",
    "epc_expiry": "2031-08-14",
    "gas_safety_expiry": "2025-11-03",
    "eicr_expiry": "2029-04-22",
    "overall_status": "compliant"
  },
  "created_at": "2024-01-15T09:32:47Z",
  "updated_at": "2025-03-28T14:18:02Z"
}

Stay in sync with 47 real-time events.

Every material change in APEX fires a webhook. From new asset creation and tenancy updates through to compliance certificate renewals and financial transactions — your systems can react in real time, not in batches.

Configure multiple webhook endpoints, with separate subscriptions per endpoint so you only receive the events each system actually needs. Per-endpoint secret rotation means a compromised endpoint never puts your other integrations at risk.

Portfolio dashboards

Asset managers and family offices build custom reporting dashboards that pull live data from APEX and present it alongside data from other systems — bank accounts, HMRC submissions, share portfolios — in a single internal view. The API's comprehensive financial fields and asset-level detail make it straightforward to replicate the APEX dashboard experience in your own BI tooling.

Accounting automation

Finance teams use webhooks to trigger automated journal entries in their ERP systems the moment a transaction is posted in APEX. Rent received, invoices raised, and maintenance costs approved in APEX flow directly into the appropriate nominal codes — eliminating double-entry and the reconciliation overhead that comes with it.

Custom integrations

Property management firms connect APEX to their own bespoke tooling — maintenance systems, tenant portals, and CRM platforms — via the API. Tenancy changes in APEX trigger provisioning in the tenant portal. Compliance certificate updates sync to the property manager's scheduling system. The API handles the data layer so each tool does what it does best.

Create an account

Sign up for APEX Capitals and complete the onboarding flow. API access is available on Professional and Enterprise plans, with sandbox access on all plans.

Generate an API key

Navigate to Settings → Developer → API Keys. Issue a scoped key with the minimum permissions your integration requires. Store it securely — it's only shown once.

Make your first request

Send a GET request to /v1/assets with your Bearer token. The response includes your full asset list with financials, tenancy, and compliance data.

Subscribe to webhooks

Register a webhook endpoint from the Developer dashboard. Choose the event types you need, set up your HMAC verification, and start receiving real-time events.