openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Hbdayaheadardbid API
  version: '1.1'
  description: RESTful interface to ISO New England energy and market data. This OpenAPI document was DERIVED by API Evangelist from ISO New England's own published, machine-generated Enunciate technical documentation at https://webservices.iso-ne.com/docs/v1.1/ and the two XML Schemas it publishes (ns0.xsd, ns1.xsd, saved verbatim under schemas/). ISO New England does not publish an OpenAPI definition; the only provider-published machine-readable description of the interface is a WADL at https://webservices.iso-ne.com/api/v1.1?_wadl&_type=xml, which sits behind the same HTTP Basic authentication as the API and returned HTTP 401 to anonymous probes. Every path, method, parameter, description, media type and schema in this document is copied from the provider's published sources; nothing was invented. Each operation carries x-evidence naming the exact documentation page it came from. All feeds are available in XML and JSON, selected by adding a .xml or .json extension to the request URL or by sending an Accept header of application/xml or application/json.
  contact:
    name: ISO New England Ask ISO
    url: https://askiso.iso-ne.com/s/
  x-provenance:
    method: derived
    derived_by: API Evangelist enrichment pipeline
    derived_on: '2026-07-27'
    sources:
    - https://webservices.iso-ne.com/docs/v1.1/
    - https://webservices.iso-ne.com/docs/v1.1/ns0.xsd
    - https://webservices.iso-ne.com/docs/v1.1/ns1.xsd
    - https://www.iso-ne.com/participate/support/web-services-data
    not_provider_published: true
    note: Derived from provider-published HTML documentation and XSDs. Not an ISO New England artifact.
servers:
- url: https://webservices.iso-ne.com/api/v1.1
  description: Production base path (HTTP Basic over SSL)
security:
- basicAuth: []
tags:
- name: hbdayaheadardbid
  description: 4 path template(s) under /hbdayaheadardbid in the published ISO New England Web Services API v1.1 documentation.
paths:
  /hbdayaheadardbid:
    get:
      operationId: getHbdayaheadardbid
      summary: Default resource
      description: Default resource. Redirects to HbDayAheadArdBidAccessor Info.
      tags:
      - hbdayaheadardbid
      responses:
        '200':
          description: Successful response.
          content:
            application/xml:
              schema:
                description: Response payload is not described in the published documentation.
            application/json:
              schema:
                description: Response payload is not described in the published documentation.
        '401':
          description: Unauthorized - HTTP Basic credentials from an ISO Express account are required. Verified by anonymous probe on 2026-07-27.
      x-evidence:
        source: https://webservices.iso-ne.com/docs/v1.1/rest.hbdayaheadardbid.html
        harvested: '2026-07-27'
  /hbdayaheadardbid/current:
    get:
      operationId: getHbdayaheadardbidCurrent
      summary: GET /hbdayaheadardbid/current
      description: (no documentation provided)
      tags:
      - hbdayaheadardbid
      responses:
        '200':
          description: Successful response.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HbDayAheadArdBids'
            application/json:
              schema:
                $ref: '#/components/schemas/HbDayAheadArdBids'
        '401':
          description: Unauthorized - HTTP Basic credentials from an ISO Express account are required. Verified by anonymous probe on 2026-07-27.
      x-evidence:
        source: https://webservices.iso-ne.com/docs/v1.1/rest.hbdayaheadardbid.current.html
        harvested: '2026-07-27'
      x-xml-element: HbDayAheadArdBids
  /hbdayaheadardbid/day/{day}:
    get:
      operationId: getHbdayaheadardbidDayByDay
      summary: Get an entire days HbDayAheadEnergyOffers
      description: Get an entire days HbDayAheadEnergyOffers.
      tags:
      - hbdayaheadardbid
      responses:
        '200':
          description: a HbDayAheadEnergyOfferElement containing the HbDayAheadEnergyOffers.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/HbDayAheadArdBids'
            application/json:
              schema:
                $ref: '#/components/schemas/HbDayAheadArdBids'
        '401':
          description: Unauthorized - HTTP Basic credentials from an ISO Express account are required. Verified by anonymous probe on 2026-07-27.
      x-evidence:
        source: https://webservices.iso-ne.com/docs/v1.1/rest.hbdayaheadardbid.day.day.html
        harvested: '2026-07-27'
      x-xml-element: HbDayAheadArdBids
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: The day to retrieve data for (YYYYMMDD)
  /hbdayaheadardbid/info:
    get:
      operationId: getHbdayaheadardbidInfo
      summary: Get the Service Info for HbDayAheadArdBid
      description: Get the Service Info for HbDayAheadArdBid.
      tags:
      - hbdayaheadardbid
      responses:
        '200':
          description: the ServiceInfoElement for HbDayAheadArdBids.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/ServiceInfo'
            application/json:
              schema:
                $ref: '#/components/schemas/ServiceInfo'
        '401':
          description: Unauthorized - HTTP Basic credentials from an ISO Express account are required. Verified by anonymous probe on 2026-07-27.
      x-evidence:
        source: https://webservices.iso-ne.com/docs/v1.1/rest.hbdayaheadardbid.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
components:
  schemas:
    HbArdBid:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        MaskedParticipantId:
          type: integer
        MaskedAssetId:
          type: integer
        Claim10Mw:
          type: number
        Claim30Mw:
          type: number
        MinimumConsumption:
          type: number
        MaximumConsumption:
          type: number
        Segments:
          $ref: '#/components/schemas/Segments'
        UnitStatus:
          type: string
          enum:
          - MUST_RUN
          - ECONOMIC
          - UNAVAILABLE
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_HbArdBid
    Segments:
      type: object
      properties:
        Segment:
          type: array
          items:
            $ref: '#/components/schemas/Segment'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_Segments
    Segment:
      type: object
      properties:
        Price:
          type: number
        Mw:
          type: number
        '@Number':
          type: integer
      required:
      - '@Number'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_Segment
    ServiceInfo:
      type: object
      properties:
        LatestBeginDate:
          type: string
          format: date-time
        CreationDate:
          type: string
          format: date-time
      required:
      - LatestBeginDate
      - CreationDate
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_ServiceInfo
    HbDayAheadArdBids:
      type: object
      properties:
        HbDayAheadArdBid:
          type: array
          items:
            $ref: '#/components/schemas/HbArdBid'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_HbDayAheadArdBids
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: HTTP Basic Authentication over SSL. Credentials come from a free, self-serve ISO Express account; ISO New England states that ISO Express account holders are automatically granted access to the public data feeds. See https://www.iso-ne.com/participate/applications-status-changes/access-software-systems