openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Actualinterchange 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: actualinterchange
  description: 4 path template(s) under /actualinterchange in the published ISO New England Web Services API v1.1 documentation.
paths:
  /actualinterchange:
    get:
      operationId: getActualinterchange
      summary: Default resource
      description: Default resource. Redirects to Actual Interchange Info.
      tags:
      - actualinterchange
      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.actualinterchange.html
        harvested: '2026-07-27'
  /actualinterchange/current:
    get:
      operationId: getActualinterchangeCurrent
      summary: Get the current Actual Interchange for all locations
      description: Get the current Actual Interchange for all locations.
      tags:
      - actualinterchange
      responses:
        '200':
          description: a ActualInterchangesElement containing the current Actual Interchange.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/ActualInterchanges'
            application/json:
              schema:
                $ref: '#/components/schemas/ActualInterchanges'
              example:
                ActualInterchanges:
                  ActualInterchange:
                  - Sale: 70
                    Purchase: -2
                    ActInterchange: 68
                    BeginDate: '2026-07-27T15:00:00.000-04:00'
                    Location:
                      '@LocId': '4010'
                      $: .I.SALBRYNB345 1
                  - Sale: 1718.75
                    Purchase: -938.25
                    ActInterchange: 780.5
                    BeginDate: '2026-07-27T15:00:00.000-04:00'
                    Location:
                      '@LocId': '4011'
                      $: .I.ROSETON 345 1
                  - Sale: 0
                    Purchase: 0
                    ActInterchange: 0
                    BeginDate: '2026-07-27T15:00:00.000-04:00'
                    Location:
                      '@LocId': '4012'
                      $: .I.HQ_P1_P2345 5
                  - Sale: 0
                    Purchase: 0
                    ActInterchange: 0
                    BeginDate: '2026-07-27T15:00:00.000-04:00'
                    Location:
                      '@LocId': '4013'
                      $: .I.HQHIGATE120 2
                  - Sale: 300
                    Purchase: 0
                    ActInterchange: 300
                    BeginDate: '2026-07-27T15:00:00.000-04:00'
                    Location:
                      '@LocId': '4014'
                      $: .I.SHOREHAM138 99
                  - Sale: 200
                    Purchase: 0
                    ActInterchange: 200
                    BeginDate: '2026-07-27T15:00:00.000-04:00'
                    Location:
                      '@LocId': '4017'
                      $: .I.NRTHPORT138 5
                  - Sale: 0
                    Purchase: -1120
                    ActInterchange: -1120
                    BeginDate: '2026-07-27T15:00:00.000-04:00'
                    Location:
                      '@LocId': '4018'
                      $: .I.HQMRL_RD345 1
        '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.actualinterchange.current.html
        harvested: '2026-07-27'
      x-xml-element: ActualInterchanges
      x-example-evidence:
        source: https://www.iso-ne.com/ws/wsclient (public ISO Express dashboard proxy, anonymous POST)
        observed: '2026-07-27'
        note: Real response payload observed anonymously through the public dashboard proxy; the proxy envelope and its _url key were removed.
  /actualinterchange/day/{day}:
    get:
      operationId: getActualinterchangeDayByDay
      summary: Get an entire days Actaul Interchanges for a given Date
      description: Get an entire days Actaul Interchanges for a given Date.
      tags:
      - actualinterchange
      responses:
        '200':
          description: a ActualInterchangesElement containing the Actual Interchanges.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/ActualInterchanges'
            application/json:
              schema:
                $ref: '#/components/schemas/ActualInterchanges'
        '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.actualinterchange.day.day.html
        harvested: '2026-07-27'
      x-xml-element: ActualInterchanges
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: The day to retrieve data for (YYYYMMDD)
  /actualinterchange/info:
    get:
      operationId: getActualinterchangeInfo
      summary: Get the Service Info for Actual Interchange
      description: Get the Service Info for Actual Interchange.
      tags:
      - actualinterchange
      responses:
        '200':
          description: the ServiceInfoElement for Actual Interchange.
          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.actualinterchange.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
components:
  schemas:
    ActualInterchange:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        Location:
          $ref: '#/components/schemas/LocationRef'
        ActInterchange:
          type: number
        Purchase:
          type: number
        Sale:
          type: number
      required:
      - BeginDate
      - Location
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_ActualInterchange
    LocationRef:
      type: object
      properties:
        $:
          type: string
          description: Element text value (serialized as "$" in the JSON representation, per observed API responses).
        '@LocId':
          type: integer
        '@LocType':
          type: string
          enum:
          - NETWORK AREA
          - LOAD ZONE
          - NETWORK NODE
          - HUB
          - HUB NODE
          - RELIABILITY REGION
          - EXT. NODE
          - RESERVE ZONE
          - SYSTEM
          - INT. AREA
          - EXT. AREA
          - DISPATCH ZONE
          - CAPACITY ZONE
          - DRRAZ
          - DRR AGGREGATION ZONE
      required:
      - '@LocId'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_LocationRef
    ActualInterchanges:
      type: object
      properties:
        ActualInterchange:
          type: array
          items:
            $ref: '#/components/schemas/ActualInterchange'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_ActualInterchanges
    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
  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