openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Fiveminutercp 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: fiveminutercp
  description: 7 path template(s) under /fiveminutercp in the published ISO New England Web Services API v1.1 documentation.
paths:
  /fiveminutercp:
    get:
      operationId: getFiveminutercp
      summary: Default resource
      description: Default resource. Redirects to Five Minute Five Minute Regulation Clearing Prices(RCPs). This endpoint has been deprecated.
      tags:
      - fiveminutercp
      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.fiveminutercp.html
        harvested: '2026-07-27'
  /fiveminutercp/current:
    get:
      operationId: getFiveminutercpCurrent
      summary: Get the current Five Minute Rcp
      description: Get the current Five Minute Rcp. This endpoint has been deprecated.
      tags:
      - fiveminutercp
      responses:
        '200':
          description: a FiveMinRcpsElement containing the current Five Minute Regulation Clearing Prices(RCPs).
          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.fiveminutercp.current.html
        harvested: '2026-07-27'
  /fiveminutercp/day/{day}:
    get:
      operationId: getFiveminutercpDayByDay
      summary: Get an entire days Five Minute RCP Only the past [?] days are supported
      description: Get an entire days Five Minute RCP Only the past [?] days are supported. This endpoint has been deprecated.
      tags:
      - fiveminutercp
      responses:
        '200':
          description: a FiveMinRcpsElement containing the Five Minute Regulation Clearing Prices(RCPs).
          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.fiveminutercp.day.day.html
        harvested: '2026-07-27'
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: The day to retrieve data for (YYYYMMDD)
  /fiveminutercp/info:
    get:
      operationId: getFiveminutercpInfo
      summary: Get the Service Info for Five Minute Five Minute Regulation Clearing Prices(RCPs)
      description: Get the Service Info for Five Minute Five Minute Regulation Clearing Prices(RCPs). This endpoint has been deprecated.
      tags:
      - fiveminutercp
      responses:
        '200':
          description: the ServiceInfoElement for Five Minute Reserve Price.
          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.fiveminutercp.info.html
        harvested: '2026-07-27'
  /fiveminutercp/{Type}/current:
    get:
      operationId: getFiveminutercpByTypeCurrent
      summary: Get the current Five Minute Rcp
      description: Get the current Five Minute Rcp.
      tags:
      - fiveminutercp
      responses:
        '200':
          description: a FiveMinRcpsElement containing the current Five Minute Regulation Clearing Prices(RCPs).
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinRcps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinRcps'
        '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.fiveminutercp.Type.current.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinRcps
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
  /fiveminutercp/{Type}/day/{day}:
    get:
      operationId: getFiveminutercpByTypeDayByDay
      summary: Get an entire days Five Minute RCP Only the past [?] days are supported
      description: Get an entire days Five Minute RCP Only the past [?] days are supported.
      tags:
      - fiveminutercp
      responses:
        '200':
          description: a FiveMinRcpsElement containing the Five Minute Regulation Clearing Prices(RCPs).
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinRcps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinRcps'
        '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.fiveminutercp.Type.day.day.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinRcps
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: The day to retrieve data for (YYYYMMDD)
  /fiveminutercp/{Type}/info:
    get:
      operationId: getFiveminutercpByTypeInfo
      summary: GET /fiveminutercp/{Type}/info
      description: (no documentation provided)
      tags:
      - fiveminutercp
      responses:
        '200':
          description: Successful response.
          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.fiveminutercp.Type.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
components:
  schemas:
    Rcp:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        RegClearingPrice:
          type: number
        RegServiceClearingPrice:
          type: number
        RegCapacityClearingPrice:
          type: number
        HourEnd:
          type: string
      required:
      - BeginDate
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_Rcp
    FiveMinRcps:
      type: object
      properties:
        FiveMinRcp:
          type: array
          items:
            $ref: '#/components/schemas/FiveMinRcp'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_FiveMinRcps
    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
    FiveMinRcp:
      $ref: '#/components/schemas/Rcp'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_FiveMinRcp
  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