Inflation Rate API

The Inflation Rate API provides access to the UK Consumer Price Index (CPI) annual inflation rate, sourced from the Office for National Statistics (ONS) via the Bank of England Statistical Interactive Database. CPI is the primary measure of inflation used by the Bank of England for its 2% inflation target.

This API provides:

• Current UK CPI annual inflation rate
• Complete monthly history back to 1989
• Each record represents a monthly CPI reading
• Daily automated updates from official BoE/ONS sources

This API is ideal for:

• Financial applications and dashboards
• Economic analysis and forecasting tools
• Property investment platforms
• Salary and pension adjustment calculators
• Cost of living comparisons

All requests to the Inflation Rate API require authentication using an API key. You can obtain your API key from your PropertyInsights dashboard after subscribing to an API plan.

Include your API key in the request header as follows:

X-API-Key: your_api_key_here

Base URL

https://propertyinsights.co.uk/api/v1/

/inflation-rates

Successful chargeable JSON responses include a top-level billing object. The endpoint examples on this page focus on the endpoint-specific data, so this repeated block may not be shown in every example.

"billing": {
  "mode": "prepaid",
  "creditsCharged": 1,
  "creditsRemaining": 1999,
  "creditsRefreshAt": "2026-08-14T09:30:00.000Z"
}

All authenticated API-key calls expose the billing headers, including validation errors and zero-credit status or management requests. Only successful chargeable JSON responses add the billing object to the response body.

All API responses are returned in JSON format. The response includes the current inflation rate and a list of monthly readings.

{
  "success": true,
  "current": {
    "rate": 3.2,
    "date": "2026-01-01",
    "label": "CPI Annual Inflation Rate"
  },
  "rates": [
    { "date": "2026-01-01", "rate": 3.2 },
    { "date": "2025-12-01", "rate": 3.0 },
    { "date": "2025-11-01", "rate": 2.8 },
    { "date": "2025-10-01", "rate": 2.6 }
  ]
}

Response Fields

The API uses standard HTTP response codes and returns detailed error information in JSON format. All errors follow a consistent structure to help you handle them appropriately in your application.

Error Response Format

{
  "success": false,
  "error": {
    "code": "NO_DATA_FOUND",
    "message": "No inflation rate data found for the specified date range"
  }
}