fourzerotwo-si

fourzerotwo-si Uk Property API

UK Property & Area: Sold prices, price summaries, house-price-index revaluations, planning designations, council lookup and a one-call area report for any UK postcode.

Documentation GitHub OpenAPI

Operations 10

GET /v1/uk-property/sold-prices UK Property & Area: Sold prices #

GET /v1/uk-property/price-summary UK Property & Area: Price summary #

GET /v1/uk-property/revalue UK Property & Area: Revalue a past sale #

GET /v1/uk-property/house-price-index UK Property & Area: House price index #

GET /v1/uk-property/planning-constraints UK Property & Area: Planning constraints #

GET /v1/uk-property/council UK Property & Area: Council & administration #

GET /v1/uk-property/area-report UK Property & Area: Area report #

GET /v1/uk-property/lease-length UK Property & Area: Lease length assessment #

GET /v1/uk-property/estate-deadlines UK Property & Area: Estate deadlines #

GET /v1/uk-property/estate-checklist UK Property & Area: Estate checklist #

Specifications

⚙

OpenAPI

https://artifacts.apis.io/fourzerotwo-si/openapi/fourzerotwo-si-uk-property-api-openapi.yml

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OpenAPI Specification

openapi: 3.2.0
info:
  title: Fourzerotwo Si Uk Property API
  version: 1.1.0
  contact:
    url: https://fourzerotwo.si
  description: 'Operations tagged uk-property across 2 of this provider''s published API definitions: openapi.json, fourzerotwo-si-openapi.json. Each path carries the servers of the definition it was published in.'
servers:
- url: https://fourzerotwo.si
tags:
- name: uk-property
  description: 'UK Property & Area: Sold prices, price summaries, house-price-index revaluations, planning designations, council lookup and a one-call area report for any UK postcode.'
paths:
  /v1/uk-property/sold-prices:
    get:
      operationId: uk_property__sold_prices
      summary: 'UK Property & Area: Sold prices'
      description: 'Every recorded sale in a postcode since 1995 (England & Wales), newest first; optionally one address. Price: $0.005 USDC per call via x402. 3 free calls/day with a free key.'
      tags:
      - uk-property
      externalDocs:
        url: https://fourzerotwo.si/apis/uk-property/sold-prices
      parameters:
      - name: postcode
        in: query
        required: true
        description: UK postcode
        schema:
          type: string
          maxLength: 10
        example: CT9 2DJ
      - name: address
        in: query
        required: false
        description: House number/name to filter to one property
        schema:
          type: string
          maxLength: 120
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.005000'
      x-free-tier: sample
      x-mcp-tool: uk-property__sold-prices
    servers:
    - url: https://fourzerotwo.si
  /v1/uk-property/price-summary:
    get:
      operationId: uk_property__price_summary
      summary: 'UK Property & Area: Price summary'
      description: 'Count, median, mean, range and by-type medians of sales in a postcode over N years. Price: $0.005 USDC per call via x402. 3 free calls/day with a free key.'
      tags:
      - uk-property
      externalDocs:
        url: https://fourzerotwo.si/apis/uk-property/price-summary
      parameters:
      - name: postcode
        in: query
        required: true
        description: UK postcode
        schema:
          type: string
          maxLength: 10
        example: CT9 2DJ
      - name: years
        in: query
        required: false
        description: Look-back years (default 5)
        schema:
          type: integer
        example: 10
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.005000'
      x-free-tier: sample
      x-mcp-tool: uk-property__price-summary
    servers:
    - url: https://fourzerotwo.si
  /v1/uk-property/revalue:
    get:
      operationId: uk_property__revalue
      summary: 'UK Property & Area: Revalue a past sale'
      description: 'Index a past sale price to today with the UK House Price Index for a region. Price: $0.005 USDC per call via x402. 3 free calls/day with a free key.'
      tags:
      - uk-property
      externalDocs:
        url: https://fourzerotwo.si/apis/uk-property/revalue
      parameters:
      - name: amount
        in: query
        required: true
        description: Sale price £
        schema:
          type: integer
        example: 250000
      - name: sale_date
        in: query
        required: true
        description: YYYY-MM-DD
        schema:
          type: string
        example: '2015-06-01'
      - name: region
        in: query
        required: false
        description: UK HPI region slug (england-and-wales, london, south-east, kent, wales, scotland…)
        schema:
          type: string
        example: kent
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.005000'
      x-free-tier: sample
      x-mcp-tool: uk-property__revalue
    servers:
    - url: https://fourzerotwo.si
  /v1/uk-property/house-price-index:
    get:
      operationId: uk_property__house_price_index
      summary: 'UK Property & Area: House price index'
      description: 'UK HPI monthly index for a region. Price: $0.003 USDC per call via x402. 3 free calls/day with a free key.'
      tags:
      - uk-property
      externalDocs:
        url: https://fourzerotwo.si/apis/uk-property/house-price-index
      parameters:
      - name: region
        in: query
        required: false
        description: Region slug
        schema:
          type: string
        example: london
      - name: months
        in: query
        required: false
        description: Months (default 24)
        schema:
          type: integer
        example: 12
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.003000'
      x-free-tier: sample
      x-mcp-tool: uk-property__house-price-index
    servers:
    - url: https://fourzerotwo.si
  /v1/uk-property/planning-constraints:
    get:
      operationId: uk_property__planning_constraints
      summary: 'UK Property & Area: Planning constraints'
      description: 'Listed building, conservation area, Article 4, TPO, green belt, AONB, national park and more at a location (England). Price: $0.005 USDC per call via x402. 3 free calls/day with a free key.'
      tags:
      - uk-property
      externalDocs:
        url: https://fourzerotwo.si/apis/uk-property/planning-constraints
      parameters:
      - name: postcode
        in: query
        required: false
        description: Postcode
        schema:
          type: string
        example: CT9 1JD
      - name: latitude
        in: query
        required: false
        description: Latitude
        schema:
          type: string
      - name: longitude
        in: query
        required: false
        description: Longitude
        schema:
          type: string
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.005000'
      x-free-tier: sample
      x-mcp-tool: uk-property__planning-constraints
    servers:
    - url: https://fourzerotwo.si
  /v1/uk-property/council:
    get:
      operationId: uk_property__council
      summary: 'UK Property & Area: Council & administration'
      description: 'Council (with website and tier), ward, parish, constituency, police force and NHS ICB for a postcode. Price: $0.002 USDC per call via x402. 3 free calls/day with a free key.'
      tags:
      - uk-property
      externalDocs:
        url: https://fourzerotwo.si/apis/uk-property/council
      parameters:
      - name: postcode
        in: query
        required: true
        description: UK postcode
        schema:
          type: string
          maxLength: 10
        example: CT9 2DJ
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.002000'
      x-free-tier: sample
      x-mcp-tool: uk-property__council
    servers:
    - url: https://fourzerotwo.si
  /v1/uk-property/area-report:
    get:
      operationId: uk_property__area_report
      summary: 'UK Property & Area: Area report'
      description: 'One call: administration, sold-price summary, planning designations, last month''s crime within a mile and flood warnings within 5km. Price: $0.03 USDC per call via x402. 3 free calls/day with a free key.'
      tags:
      - uk-property
      externalDocs:
        url: https://fourzerotwo.si/apis/uk-property/area-report
      parameters:
      - name: postcode
        in: query
        required: true
        description: UK postcode
        schema:
          type: string
          maxLength: 10
        example: CT9 2DJ
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.030000'
      x-free-tier: sample
      x-mcp-tool: uk-property__area-report
    servers:
    - url: https://fourzerotwo.si
  /v1/uk-property/lease-length:
    get:
      operationId: uk_property__lease_length
      summary: 'UK Property & Area: Lease length assessment'
      description: 'Years remaining on a lease and a red/amber/green mortgageability and extension-cost assessment. Price: $0.003 USDC per call via x402. 3 free calls/day with a free key.'
      tags:
      - uk-property
      externalDocs:
        url: https://fourzerotwo.si/apis/uk-property/lease-length
      parameters:
      - name: lease_start
        in: query
        required: true
        description: Lease start YYYY-MM-DD
        schema:
          type: string
        example: '1985-03-25'
      - name: term_years
        in: query
        required: true
        description: Original term in years
        schema:
          type: integer
        example: 99
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.003000'
      x-free-tier: sample
      x-mcp-tool: uk-property__lease-length
    servers:
    - url: https://fourzerotwo.si
  /v1/uk-property/estate-deadlines:
    get:
      operationId: uk_property__estate_deadlines
      summary: 'UK Property & Area: Estate deadlines'
      description: 'Key probate dates: 1975 Act claim window, Gazette creditor deadline, executor''s year and IHT due date (England & Wales). Price: $0.003 USDC per call via x402. 3 free calls/day with a free key.'
      tags:
      - uk-property
      externalDocs:
        url: https://fourzerotwo.si/apis/uk-property/estate-deadlines
      parameters:
      - name: date_of_death
        in: query
        required: false
        description: YYYY-MM-DD
        schema:
          type: string
        example: '2026-02-14'
      - name: grant_date
        in: query
        required: false
        description: YYYY-MM-DD
        schema:
          type: string
        example: '2026-07-01'
      - name: notice_claim_date
        in: query
        required: false
        description: Gazette claim deadline YYYY-MM-DD
        schema:
          type: string
      - name: gross_estate
        in: query
        required: false
        description: Gross estate £
        schema:
          type: integer
        example: 410000
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.003000'
      x-free-tier: sample
      x-mcp-tool: uk-property__estate-deadlines
    servers:
    - url: https://fourzerotwo.si
  /v1/uk-property/estate-checklist:
    get:
      operationId: uk_property__estate_checklist
      summary: 'UK Property & Area: Estate checklist'
      description: 'What happens next for an estate, from the grant''s facts: who is responsible, intestacy, the 1975 Act claim window, creditor deadline, IHT and the executor''s year (England & Wales). Price: $0.005 USDC per call via x402. 3 free calls/day with a free key.'
      tags:
      - uk-property
      externalDocs:
        url: https://fourzerotwo.si/apis/uk-property/estate-checklist
      parameters:
      - name: representatives
        in: query
        required: false
        description: Comma list of executors/administrators
        schema:
          type: string
          maxLength: 300
        example: Jane Smith, John Smith
      - name: professional
        in: query
        required: false
        description: true if a solicitor/professional is named
        schema:
          type: string
          maxLength: 5
        example: 'false'
      - name: has_will
        in: query
        required: false
        description: true or false
        schema:
          type: string
          maxLength: 5
        example: 'true'
      - name: grant_date
        in: query
        required: false
        description: YYYY-MM-DD
        schema:
          type: string
          maxLength: 10
        example: '2026-07-01'
      - name: notice_claim_date
        in: query
        required: false
        description: Gazette claim deadline YYYY-MM-DD
        schema:
          type: string
          maxLength: 10
      - name: gross_estate
        in: query
        required: false
        description: Gross estate £
        schema:
          type: integer
        example: 410000
      - name: date_of_death
        in: query
        required: false
        description: YYYY-MM-DD
        schema:
          type: string
          maxLength: 10
        example: '2026-02-14'
      - name: has_trust
        in: query
        required: false
        description: true if the will sets up a trust
        schema:
          type: string
          maxLength: 5
        example: 'false'
      responses:
        '200':
          description: The data (paid, or free tier).
          content:
            application/json: {}
        '402':
          $ref: '#/components/responses/PaymentRequired'
        '400':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
        '502':
          $ref: '#/components/responses/Error'
      security:
      - {}
      - freeKey: []
      x-price-usd: '0.005000'
      x-free-tier: sample
      x-mcp-tool: uk-property__estate-checklist
    servers:
    - url: https://fourzerotwo.si
components:
  responses:
    PaymentRequired:
      description: x402 payment required. The body (also base64 in the PAYMENT-REQUIRED header) lists accepted payments.
      headers:
        PAYMENT-REQUIRED:
          schema:
            type: string
          description: Base64 JSON x402 v2 PaymentRequired
      content:
        application/json:
          schema:
            type: object
            properties:
              x402Version:
                type: integer
              error:
                type: string
              accepts:
                type: array
                items:
                  type: object
    Error:
      description: 400 = invalid input, 404 = not found at the source, 502 = the source failed. Never charged.
      content:
        application/json:
          schema:
            type: object
            properties:
              error:
                type: string
              charged:
                type: boolean
  securitySchemes:
    freeKey:
      type: apiKey
      in: header
      name: X-API-Key
      description: Optional free key (fzt_…) for the free tier.
x-refined-from:
- openapi.json
- fourzerotwo-si-openapi.json