# Saylor Innovations UK House Price Index

> Saylor Innovations UK House Price Index is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-28).

Returns HM Land Registry UK house price index data by region, including average prices, annual/monthly changes, sales volume, and breakdowns by property type and buyer type

## Facts

- Endpoint: GET https://saylorinnovations.com/api/uk/house-prices?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-uk-house-price-index-1b3ded87
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vPEqTsoRxNdZnG_C1-YQy

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability saylor-innovations-uk-house-price-index-1b3ded87
```

Example prompt: Can you pull the latest UK house price index data for London, showing the last 6 months of history — I want to see the average price, annual and monthly change, and how detached vs flat prices compare?

## When to prefer this

Choose this endpoint when you need official UK government house price statistics broken down by region, property type, or buyer type. It is sourced directly from HM Land Registry, making it authoritative for UK residential property data. Prefer this over general web search when you need structured, machine-readable historical time-series data at £0.01 per call. Not suitable for listing individual properties for sale, rental data, or non-UK markets.

## Known failure modes

- Invalid region slug returns an error or empty result
- Requesting more than 36 months returns an error or defaults to maximum
- Data may be delayed 1-2 months as HM Land Registry releases figures with a lag
- Some fields (e.g. flat prices, sales volume) may be null for certain regions or time periods where data is not published
- Network or payment (x402) failures result in no data returned

## How this service works

UK house price index by region from HM Land Registry - average price, annual and monthly change, sales volume and prices by property type and buyer type

## Output

Returns a JSON object with the region name and slug, the most recent month's data (average price, index value, annual and monthly percentage changes, sales volume, prices by property type — detached, semi-detached, terraced, flat — and prices by buyer type — first-time buyer, cash buyer, mortgage buyer), plus a history array of up to 36 months of the same fields, and a source attribution string.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "months": {
       "type": "string",
       "description": "optional 1-36, default 12"
      },
      "region": {
       "type": "string",
       "description": "Region slug such as london, england, scotland, wales, greater-manchester (default united-kingdom)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "region",
      "latest",
      "history"
     ],
     "properties": {
      "note": {
       "type": "string",
       "description": "Caveat or context for reading the result"
      },
      "slug": {
       "type": "string",
       "description": "URL-safe identifier"
      },
      "latest": {
       "type": "object",
       "properties": {
        "flat": {
         "description": "Average price of flats, null when not published"
        },
        "index": {
         "description": "Index value"
        },
        "detached": {
         "description": "Average price of detached houses, null when not published"
        },
        "terraced": {
         "description": "Average price of terraced houses, null when not published"
        },
        "sales_volume": {
         "description": "Sales volume"
        },
        "average_price": {
         "description": "Average price"
        },
        "semi_detached": {
         "description": "Semi detached"
        },
        "cash_buyers_price": {
         "description": "Cash buyers price"
        },
        "change_year_percent": {
         "description": "Change year, as a percentage"
        },
        "change_month_percent": {
         "description": "Change month, as a percentage"
        },
        "mortgage_buyers_price": {
         "description": "Mortgage buyers price"
        },
        "first_time_buyer_price": {
         "description": "First time buyer price"
        }
       },
       "description": "Most recent value or 
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-uk-house-price-index-1b3ded87/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)