Steadfast Flood Risk Tracker API

openapi: 3.1.0
info:
  title: Steadfast Flood Risk Tracker API
  version: '1.0'
  summary: Anonymous Australian address lookup and Swiss Re natural-catastrophe flood risk scoring.
  description: >-
    The read-only JSON API behind Steadfast Group's public Flood Risk Tracker web tool
    (https://floodrisktracker.steadfast.com.au/). It resolves a free-text Australian street
    address against the G-NAF (Geocoded National Address File) identifier set, then returns
    natural-catastrophe flood risk layers for that address, sourced from Swiss Re hazard
    models (river/fluvial flood and coastal storm surge).


    PROVENANCE AND STATUS - this document is NOT published by Steadfast Group. Steadfast
    Group publishes no developer portal and no API specification of any kind. This OpenAPI
    was DERIVED by API Evangelist from the tool's own client JavaScript
    (/Scripts/FloodRiskTracker/custom.js, which calls both operations via jQuery $.ajax)
    and from live, anonymous, unauthenticated probes of the two endpoints on 2026-07-25.
    Every path, parameter name, field name, status code, media type and example in this
    document was OBSERVED in a real response - nothing is invented. It is nonetheless an
    undocumented, unsupported, unversioned-in-public surface that Steadfast may change or
    close without notice, and it should be treated as observational intelligence rather
    than as a contract Steadfast offers.


    OBSERVED RUNTIME NOTES - the API is fronted by Cloudflare and served by ASP.NET Core
    (`x-powered-by: ASP.NET`). Responses carry `api-supported-versions: 1.0`, and each risk
    layer object carries its own `version` field (observed value `/v1/`). Validation errors
    are returned as RFC 9457 `application/problem+json` (ASP.NET Core ValidationProblemDetails)
    with a W3C Trace Context `traceId`. CORS is restricted - the observed
    `access-control-allow-origin` is `https://steadfastinsurance.wufoo.com`, so browser-based
    cross-origin use from other origins is not permitted. No authentication of any kind is
    required or accepted; no rate limits are documented.
  contact:
    name: Steadfast Group Limited
    url: https://www.steadfast.com.au/contact-us/
  x-apievangelist-provenance:
    method: derived
    derived_from:
      - https://floodrisktracker.steadfast.com.au/Scripts/FloodRiskTracker/custom.js
      - live anonymous probes of both operations on 2026-07-25
    published_by_provider: false
    supported_contract: false
servers:
  - url: https://floodrisktracker.steadfast.com.au
    description: Production host for the public Flood Risk Tracker web tool and its JSON API.
tags:
  - name: Address
    description: Australian address resolution against G-NAF identifiers.
  - name: Risk
    description: Natural-catastrophe flood risk layers for a resolved address.
paths:
  /api/risk/find_address:
    get:
      operationId: findAddress
      tags:
        - Address
      summary: Search Australian addresses
      description: >-
        Resolves a free-text address fragment to a list of candidate Australian addresses,
        each carrying the G-NAF identifier required by `getFloodRisk`. Observed to return an
        empty array for addresses outside Australia (a New Zealand query returned `[]`), and
        to return more candidates than the tool's UI displays - the client slices the first
        five. Observed `latitude` and `longitude` were `null` on every candidate returned.
      parameters:
        - name: searchText
          in: query
          required: true
          description: Free-text Australian address fragment, e.g. `1 Market Street`.
          schema:
            type: string
            minLength: 1
          example: 1 Market Street
      responses:
        '200':
          description: Candidate addresses. An empty array means no match was found.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/AddressCandidate'
              examples:
                observed:
                  summary: Observed response for `searchText=1 Market Street` (truncated to two of five)
                  value:
                    - id: AU|GNAF|GASA_422065999
                      fullAddress: 1 MARKET STREET, BURRA SA 5417
                      latitude: null
                      longitude: null
                    - id: AU|GNAF|GAVIC423795616
                      fullAddress: 1 MARKET STREET, NEWPORT VIC 3015
                      latitude: null
                      longitude: null
                noMatch:
                  summary: Observed response for a non-Australian address
                  value: []
        '400':
          $ref: '#/components/responses/ValidationProblem'
  /api/risk/get_flood_risk:
    get:
      operationId: getFloodRisk
      tags:
        - Risk
      summary: Get flood risk layers for an address
      description: >-
        Returns the natural-catastrophe flood risk layers for a G-NAF address identifier
        obtained from `findAddress`. Two layers were observed on every successful call:
        `FL_Fluvial_SwissRe` (river/fluvial flood) and `FL_Surge_SwissRe` (coastal storm
        surge). An unknown or malformed identifier was observed to return `200` with an empty
        array rather than a 404.
      parameters:
        - name: addressId
          in: query
          required: true
          description: >-
            G-NAF address identifier returned in `AddressCandidate.id`, e.g.
            `AU|GNAF|GANSW705226154`.
          schema:
            type: string
          example: AU|GNAF|GANSW705226154
      responses:
        '200':
          description: >-
            Risk layers for the address. An empty array means no risk data was resolved for
            the supplied identifier.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/RiskLayer'
              examples:
                highFluvialRisk:
                  summary: Observed response for 1 MOLESWORTH STREET, LISMORE NSW 2480
                  value:
                    - layerId: FL_Surge_SwissRe
                      valueLabel: Outside
                      intensity: '1'
                      riskIndex: 1
                      details: "{\r\n  \"Surge Return Period\": \"Outside\"\r\n}"
                      riskDescription: Low
                      version: /v1/
                    - layerId: FL_Fluvial_SwissRe
                      valueLabel: 50 years
                      intensity: '8.9'
                      riskIndex: 7
                      details: "{\r\n  \"FF Return Period (SR)\": \"50 years\",\r\n  \"FF Protection (SR)\": \"Unprotected\",\r\n  \"FF Schema (SR)\": \"SR_GFZ3\",\r\n  \"FF Code (SR)\": \"SR_GFZ3_50\",\r\n  \"FF Frequency (SR)\": \"Very High\"\r\n}"
                      riskDescription: High
                      version: /v1/
                lowRisk:
                  summary: Observed response for 1 MARKET STREET, NEWPORT VIC 3015
                  value:
                    - layerId: FL_Surge_SwissRe
                      valueLabel: Outside
                      intensity: '1'
                      riskIndex: 1
                      details: "{\r\n  \"Surge Return Period\": \"Outside\"\r\n}"
                      riskDescription: Low
                      version: /v1/
                    - layerId: FL_Fluvial_SwissRe
                      valueLabel: Outside
                      intensity: '1'
                      riskIndex: 1
                      details: "{\r\n  \"FF Return Period (SR)\": \"Outside\",\r\n  \"FF Protection (SR)\": \"Unprotected\",\r\n  \"FF Schema (SR)\": \"SR_GFZ3\",\r\n  \"FF Code (SR)\": \"Outside\",\r\n  \"FF Frequency (SR)\": \"Outside\"\r\n}"
                      riskDescription: Low
                      version: /v1/
                noData:
                  summary: Observed response for an unrecognised identifier
                  value: []
        '400':
          $ref: '#/components/responses/ValidationProblem'
components:
  responses:
    ValidationProblem:
      description: >-
        The required query parameter was missing. Returned as RFC 9457 problem details
        (ASP.NET Core `ValidationProblemDetails`).
      content:
        application/problem+json:
          schema:
            $ref: '#/components/schemas/ValidationProblemDetails'
          examples:
            observed:
              summary: Observed response when `addressId` is omitted
              value:
                type: https://tools.ietf.org/html/rfc9110#section-15.5.1
                title: One or more validation errors occurred.
                status: 400
                errors:
                  addressId:
                    - The addressId field is required.
                traceId: 00-ce51a3cb1302ff41a4b7b151de452c73-495f67f482a4fb3a-00
  schemas:
    AddressCandidate:
      type: object
      title: AddressCandidate
      description: A candidate Australian address resolved from free text.
      properties:
        id:
          type: string
          description: >-
            Pipe-delimited address identifier. Observed form `AU|GNAF|<G-NAF PID>` -
            country code, address dataset (G-NAF, the Geocoded National Address File),
            and the persistent identifier. This value is the `addressId` input to
            `getFloodRisk`.
          examples:
            - AU|GNAF|GANSW705226154
        fullAddress:
          type: string
          description: Upper-case formatted address including state and postcode.
          examples:
            - 1 MOLESWORTH STREET, LISMORE NSW 2480
        latitude:
          type:
            - number
            - 'null'
          description: Observed `null` on every candidate returned; the tool geocodes client-side via Google Maps instead.
        longitude:
          type:
            - number
            - 'null'
          description: Observed `null` on every candidate returned.
      required:
        - id
        - fullAddress
    RiskLayer:
      type: object
      title: RiskLayer
      description: One natural-catastrophe hazard layer scored for an address.
      properties:
        layerId:
          type: string
          description: >-
            Hazard layer identifier. Observed values are `FL_Fluvial_SwissRe` (river flood)
            and `FL_Surge_SwissRe` (coastal storm surge); the `_SwissRe` suffix identifies
            Swiss Re as the hazard data source.
          examples:
            - FL_Fluvial_SwissRe
            - FL_Surge_SwissRe
        valueLabel:
          type: string
          description: >-
            Human-readable hazard value. Observed values include `Outside` (outside the
            modelled hazard zone) and return-period labels such as `50 years`.
          examples:
            - Outside
            - 50 years
        intensity:
          type: string
          description: Hazard intensity as a decimal string. Observed `1` through `8.9`.
          examples:
            - '1'
            - '8.9'
        riskIndex:
          type: integer
          description: >-
            Numeric risk band the tool maps to a CSS class (`risk-<n>`). Observed values 1
            and 7; the tool renders a graduated bar from this value.
          examples:
            - 1
            - 7
        riskDescription:
          type: string
          description: >-
            Risk band label the tool renders as "<value> Risk". Observed values `Low` and
            `High`. When absent/empty the tool renders "No Risk Data".
          examples:
            - Low
            - High
        details:
          type: string
          description: >-
            A JSON document embedded as a string (double-encoded, CRLF-formatted) carrying
            the underlying Swiss Re model attributes for the layer - e.g. `FF Return Period
            (SR)`, `FF Protection (SR)`, `FF Schema (SR)`, `FF Code (SR)`, `FF Frequency (SR)`
            for fluvial flood, and `Surge Return Period` for storm surge. Consumers must
            parse this string as JSON.
          contentMediaType: application/json
        version:
          type: string
          description: Layer data version. Observed `/v1/` on every layer.
          examples:
            - /v1/
      required:
        - layerId
    ValidationProblemDetails:
      type: object
      title: ValidationProblemDetails
      description: RFC 9457 problem details as emitted by ASP.NET Core model validation.
      properties:
        type:
          type: string
          format: uri
          description: Problem type URI. Observed as an RFC 9110 status-code section link.
        title:
          type: string
        status:
          type: integer
        errors:
          type: object
          description: Map of parameter name to an array of validation messages.
          additionalProperties:
            type: array
            items:
              type: string
        traceId:
          type: string
          description: W3C Trace Context `traceparent` value for the failed request.
      required:
        - type
        - title
        - status