openapi: 3.2.0
info:
  title: ISO New England Web Services API v1.1 Fiveminutelmp 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: fiveminutelmp
  description: 14 path template(s) under /fiveminutelmp in the published ISO New England Web Services API v1.1 documentation.
paths:
  /fiveminutelmp:
    get:
      operationId: getFiveminutelmp
      summary: Default resource
      description: Default resource. Redirects to Five Minute LMP Info.
      tags:
      - fiveminutelmp
      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.fiveminutelmp.html
        harvested: '2026-07-27'
  /fiveminutelmp/current:
    get:
      operationId: getFiveminutelmpCurrent
      summary: Get the current Five Minute LMPs for Hub, Load Zones, and External Nodes
      description: Get the current Five Minute LMPs for Hub, Load Zones, and External Nodes.
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: a FiveMinuteLmpsElement containing the current Five Minute LMPs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
              example:
                FiveMinLmps:
                  FiveMinLmp:
                  - LmpTotal: 68.04
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: 0.16
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4000'
                      '@LocType': HUB
                      $: .H.INTERNAL_HUB
                  - LmpTotal: 64.36
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: -3.52
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4001'
                      '@LocType': LOAD ZONE
                      $: .Z.MAINE
                  - LmpTotal: 67.85
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: -0.03
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4002'
                      '@LocType': LOAD ZONE
                      $: .Z.NEWHAMPSHIRE
                  - LmpTotal: 70.19
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: 2.31
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4003'
                      '@LocType': LOAD ZONE
                      $: .Z.VERMONT
                  - LmpTotal: 67.93
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: 0.05
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4004'
                      '@LocType': LOAD ZONE
                      $: .Z.CONNECTICUT
                  - LmpTotal: 67.32
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: -0.56
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4005'
                      '@LocType': LOAD ZONE
                      $: .Z.RHODEISLAND
                  - LmpTotal: 68.45
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: 0.57
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4006'
                      '@LocType': LOAD ZONE
                      $: .Z.SEMASS
                  - LmpTotal: 68.16
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: 0.28
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4007'
                      '@LocType': LOAD ZONE
                      $: .Z.WCMASS
                  - LmpTotal: 68.22
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: 0.34
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4008'
                      '@LocType': LOAD ZONE
                      $: .Z.NEMASSBOST
                  - LmpTotal: 63.68
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: -4.2
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4010'
                      '@LocType': EXT. NODE
                      $: .I.SALBRYNB345 1
                  - LmpTotal: 68.03
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: 0.15
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4011'
                      '@LocType': EXT. NODE
                      $: .I.ROSETON 345 1
                  - LmpTotal: 67.3
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: -0.58
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4012'
                      '@LocType': EXT. NODE
                      $: .I.HQ_P1_P2345 5
                  - LmpTotal: 71.64
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: 3.76
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4013'
                      '@LocType': EXT. NODE
                      $: .I.HQHIGATE120 2
                  - LmpTotal: 69.04
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: 1.16
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4014'
                      '@LocType': EXT. NODE
                      $: .I.SHOREHAM138 99
                  - LmpTotal: 68.53
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: 0.65
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4017'
                      '@LocType': EXT. NODE
                      $: .I.NRTHPORT138 5
                  - LmpTotal: 60.9
                    CongestionComponent: 0
                    EnergyComponent: 67.88
                    LossComponent: -6.98
                    BeginDate: '2026-07-27T17:25:00.000-04:00'
                    Location:
                      '@LocId': '4018'
                      '@LocType': EXT. NODE
                      $: .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.fiveminutelmp.current.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmps
      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.
  /fiveminutelmp/current/all:
    get:
      operationId: getFiveminutelmpCurrentAll
      summary: Get the current Five Minute LMPs for all locations
      description: Get the current Five Minute LMPs for all locations
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: a FiveMinuteLmpsElement containing the current Five Minute LMPs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
        '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.fiveminutelmp.current.all.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmps
  /fiveminutelmp/current/location/{locationId}:
    get:
      operationId: getFiveminutelmpCurrentLocationByLocationId
      summary: Get the current Five Minute LMPs for a given location
      description: Get the current Five Minute LMPs for a given location.
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: a LmpElement containing the current Five Minute LMP for the given location.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmp'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmp'
        '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.fiveminutelmp.current.location.locationId.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmp
      parameters:
      - name: locationId
        in: path
        required: true
        schema:
          type: string
        description: The location id
  /fiveminutelmp/current/locationType/{locationType}:
    get:
      operationId: getFiveminutelmpCurrentLocationTypeByLocationType
      summary: Get the current Five Minute LMPs for a given location type
      description: Get the current Five Minute LMPs for a given location type.
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: a FiveMinLmpsElement containing the current Five Minute LMP for the given location.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
        '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.fiveminutelmp.current.locationType.locationType.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmps
      parameters:
      - name: locationType
        in: path
        required: true
        schema:
          type: string
        description: The locationType (one of RESERVE ZONE, HUB, NETWORK NODE, RELIABILITY REGION, HUB NODE, SYSTEM, NETWORK AREA, LOAD ZONE)
  /fiveminutelmp/day/{day}/location/{locationId}:
    get:
      operationId: getFiveminutelmpDayByDayLocationByLocationId
      summary: Get an entire days Five Minute LMPs for a given location
      description: Get an entire days Five Minute LMPs for a given location. Only the past [?] days are supported.
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: a FiveMinuteLmpsElement containing the Five Minute LMPs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
        '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.fiveminutelmp.day.day.location.locationId.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmps
      parameters:
      - name: day
        in: path
        required: true
        schema:
          type: string
        description: The day to retrieve data for (YYYYMMDD)
      - name: locationId
        in: path
        required: true
        schema:
          type: string
        description: The location id
  /fiveminutelmp/info:
    get:
      operationId: getFiveminutelmpInfo
      summary: Get the Service Info for Five Minute LMPs
      description: Get the Service Info for Five Minute LMPs.
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: the ServiceInfoElement for Five Minute LMPs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/ServiceInfo'
            application/json:
              schema:
                $ref: '#/components/schemas/ServiceInfo'
              example:
                ServiceInfo:
                  CreationDate: '2026-07-27T17:25:25.000-04:00'
                  LatestBeginDate: '2026-07-27T17:25:00.000-04:00'
        '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.fiveminutelmp.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
      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.
  /fiveminutelmp/{Type}/current:
    get:
      operationId: getFiveminutelmpByTypeCurrent
      summary: Get the current Five Minute LMPs for Hub, Load Zones, and External Nodes
      description: Get the current Five Minute LMPs for Hub, Load Zones, and External Nodes.
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: a FiveMinuteLmpsElement containing the current Five Minute LMPs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
        '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.fiveminutelmp.Type.current.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmps
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
  /fiveminutelmp/{Type}/current/all:
    get:
      operationId: getFiveminutelmpByTypeCurrentAll
      summary: Get the current Five Minute LMPs for all locations
      description: Get the current Five Minute LMPs for all locations
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: a FiveMinuteLmpsElement containing the current Five Minute LMPs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
        '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.fiveminutelmp.Type.current.all.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmps
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
  /fiveminutelmp/{Type}/current/location/{locationId}:
    get:
      operationId: getFiveminutelmpByTypeCurrentLocationByLocationId
      summary: Get the current Five Minute LMPs for a given location
      description: Get the current Five Minute LMPs for a given location.
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: a LmpElement containing the current Five Minute LMP for the given location.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
        '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.fiveminutelmp.Type.current.location.locationId.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmps
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
      - name: locationId
        in: path
        required: true
        schema:
          type: string
        description: The location id
  /fiveminutelmp/{Type}/current/locationType/{locationType}:
    get:
      operationId: getFiveminutelmpByTypeCurrentLocationTypeByLocationType
      summary: Get the current Five Minute LMPs for a given location type
      description: Get the current Five Minute LMPs for a given location type.
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: a FiveMinLmpsElement containing the current Five Minute LMP for the given location.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
        '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.fiveminutelmp.Type.current.locationType.locationType.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmps
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
      - name: locationType
        in: path
        required: true
        schema:
          type: string
        description: The locationType (one of RESERVE ZONE, HUB, NETWORK NODE, RELIABILITY REGION, HUB NODE, SYSTEM, NETWORK AREA, LOAD ZONE)
  /fiveminutelmp/{Type}/day/{day}/location/{locationId}:
    get:
      operationId: getFiveminutelmpByTypeDayByDayLocationByLocationId
      summary: Get an entire days Five Minute LMPs for a given location
      description: Get an entire days Five Minute LMPs for a given location. Only the past [?] days are supported.
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: a FiveMinuteLmpsElement containing the Five Minute LMPs.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
        '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.fiveminutelmp.Type.day.day.location.locationId.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmps
      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)
      - name: locationId
        in: path
        required: true
        schema:
          type: string
        description: The location id
  /fiveminutelmp/{Type}/day/{day}/starthour/{sh}:
    get:
      operationId: getFiveminutelmpByTypeDayByDayStarthourBySh
      summary: GET /fiveminutelmp/{Type}/day/{day}/starthour/{sh}
      description: (no documentation provided)
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: Successful response.
          content:
            application/xml:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
            application/json:
              schema:
                $ref: '#/components/schemas/FiveMinLmps'
        '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.fiveminutelmp.Type.day.day.starthour.sh.html
        harvested: '2026-07-27'
      x-xml-element: FiveMinLmps
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
      - name: day
        in: path
        required: true
        schema:
          type: string
      - name: sh
        in: path
        required: true
        schema:
          type: string
  /fiveminutelmp/{Type}/info:
    get:
      operationId: getFiveminutelmpByTypeInfo
      summary: Get the Service Info for Five Minute LMPs
      description: Get the Service Info for Five Minute LMPs.
      tags:
      - fiveminutelmp
      responses:
        '200':
          description: the ServiceInfoElement for Five Minute LMPs.
          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.fiveminutelmp.Type.info.html
        harvested: '2026-07-27'
      x-xml-element: ServiceInfo
      parameters:
      - name: Type
        in: path
        required: true
        schema:
          type: string
components:
  schemas:
    FiveMinLmp:
      $ref: '#/components/schemas/Lmp'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_FiveMinLmp
    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
    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
    FiveMinLmps:
      type: object
      properties:
        FiveMinLmp:
          type: array
          items:
            $ref: '#/components/schemas/Lmp'
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_FiveMinLmps
    Lmp:
      type: object
      properties:
        BeginDate:
          type: string
          format: date-time
        Location:
          $ref: '#/components/schemas/LocationRef'
        LmpTotal:
          type: number
        EnergyComponent:
          type: number
        CongestionComponent:
          type: number
        LossComponent:
          type: number
      required:
      - BeginDate
      - Location
      x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_Lmp
  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