openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Fiveminuteconstraints 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: fiveminuteconstraints
  description: 4 path template(s) under /fiveminuteconstraints in the published ISO New England Web Services API v1.1 documentation.
paths:
  /fiveminuteconstraints/{Type}/current:
    get:
      operationId: getFiveminuteconstraintsByTypeCurrent
      summary: 'Get the current Real Time Constraints '
      description: Get the current Real Time Constraints .
      tags:
      - fiveminuteconstraints
      responses:
        '200':
          description: a RealTimeConstraintsElement containing the current Real Time Constraints.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/RealTimeConstraints'
            application/json:
              schema:
                $ref: '#/components/schemas/RealTimeConstraints'
        '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.fiveminuteconstraints.Type.current.html
        harvested: '2026-07-27'
      x-xml-element: RealTimeConstraints
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
  /fiveminuteconstraints/{Type}/current/hour:
    get:
      operationId: getFiveminuteconstraintsByTypeCurrentHour
      summary: 'Get the current Hour Real Time Constraints '
      description: Get the current Hour Real Time Constraints .
      tags:
      - fiveminuteconstraints
      responses:
        '200':
          description: a RealTimeConstraintsElement containing the current Hour Real Time Constraints.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/RealTimeConstraints'
            application/json:
              schema:
                $ref: '#/components/schemas/RealTimeConstraints'
        '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.fiveminuteconstraints.Type.current.hour.html
        harvested: '2026-07-27'
      x-xml-element: RealTimeConstraints
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
  /fiveminuteconstraints/{Type}/day/{day}:
    get:
      operationId: getFiveminuteconstraintsByTypeDayByDay
      summary: Get Real Time Constraints for the day
      description: Get Real Time Constraints for the day.
      tags:
      - fiveminuteconstraints
      responses:
        '200':
          description: a RealTimeConstraintsElement containing the Real Time constraints.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/RealTimeConstraints'
            application/json:
              schema:
                $ref: '#/components/schemas/RealTimeConstraints'
        '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.fiveminuteconstraints.Type.day.day.html
        harvested: '2026-07-27'
      x-xml-element: RealTimeConstraints
      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)
  /fiveminuteconstraints/{Type}/info:
    get:
      operationId: getFiveminuteconstraintsByTypeInfo
      summary: Get the Service Info for Real Time Constraints
      description: Get the Service Info for Real Time Constraints.
      tags:
      - fiveminuteconstraints
      responses:
        '200':
          description: the ServiceInfoElement for Real Time Constraints.
          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.fiveminuteconstraints.Type.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
components:
  schemas:
    Constraint:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        ConstraintName:
          type: string
        ContingencyName:
          type: string
        InterfaceFlag:
          type: string
          enum:
          - Y
          - N
          - '-'
        MarginalValue:
          type: number
      required:
      - BeginDate
      - ConstraintName
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_Constraint
    RealTimeConstraint:
      $ref: '#/components/schemas/Constraint'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_RealTimeConstraint
    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
    RealTimeConstraints:
      type: object
      properties:
        RealTimeConstraint:
          type: array
          items:
            $ref: '#/components/schemas/RealTimeConstraint'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_RealTimeConstraints
  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