openapi: 3.2.0 info: title: ISO New England Web Services API v1.1 Frmdtp 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: frmdtp description: 5 path template(s) under /frmdtp in the published ISO New England Web Services API v1.1 documentation. paths: /frmdtp: get: operationId: getFrmdtp summary: Default resource description: Default resource. Redirects to Daily FRMDTP Info . tags: - frmdtp 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.frmdtp.html harvested: '2026-07-27' /frmdtp/current: get: operationId: getFrmdtpCurrent summary: Get the current Daily FRMTP description: Get the current Daily FRMTP. tags: - frmdtp responses: '200': description: a DailyFrmThresholdPricesElement containing the current Forward Reserved Market Daily Threshold Price. content: application/xml: schema: $ref: '#/components/schemas/DailyFrmThresholdPrices' application/json: schema: $ref: '#/components/schemas/DailyFrmThresholdPrices' '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.frmdtp.current.html harvested: '2026-07-27' x-xml-element: DailyFrmThresholdPrices /frmdtp/day/{day}: get: operationId: getFrmdtpDayByDay summary: Get an entire day FRMDTP for given day description: Get an entire day FRMDTP for given day. Only the past [?] days are supported. tags: - frmdtp responses: '200': description: a DailyFrmThresholdPricesElement containing the Forward Reserve Marked Daily Threshold Price. content: application/xml: schema: $ref: '#/components/schemas/DailyFrmThresholdPrices' application/json: schema: $ref: '#/components/schemas/DailyFrmThresholdPrices' '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.frmdtp.day.day.html harvested: '2026-07-27' x-xml-element: DailyFrmThresholdPrices parameters: - name: day in: path required: true schema: type: string description: The day to retrieve data for (YYYYMMDD) /frmdtp/info: get: operationId: getFrmdtpInfo summary: 'Get the Service Info for Daily Forward Reserved Marked Threshold Price ' description: Get the Service Info for Daily Forward Reserved Marked Threshold Price . tags: - frmdtp responses: '200': description: the ServiceInfoElement for Daily FRMTP. 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.frmdtp.info.html harvested: '2026-07-27' x-xml-element: ServiceInfo /frmdtp/month/{month}: get: operationId: getFrmdtpMonthByMonth summary: Get an entire month FRMDTP for given day description: Get an entire month FRMDTP for given day. Only the past [?] days are supported. tags: - frmdtp responses: '200': description: a DailyFrmThresholdPricesElement containing the Forward Reserve Marked Daily Threshold Price. content: application/xml: schema: $ref: '#/components/schemas/DailyFrmThresholdPrices' application/json: schema: $ref: '#/components/schemas/DailyFrmThresholdPrices' '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.frmdtp.month.month.html harvested: '2026-07-27' x-xml-element: DailyFrmThresholdPrices parameters: - name: month in: path required: true schema: type: string components: schemas: DailyFrmThresholdPrice: type: object properties: BeginDate: type: string format: date-time ForwardReservedHeatRate: type: number FuelIndex: type: number ForwardReserveThresholdPrice: type: number required: - BeginDate - ForwardReservedHeatRate - FuelIndex - ForwardReserveThresholdPrice x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_DailyFrmThresholdPrice 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 DailyFrmThresholdPrices: type: object properties: DailyFrmThresholdPrice: type: array items: $ref: '#/components/schemas/DailyFrmThresholdPrice' x-xsd-source: schemas/iso-new-england-web-services-ns0.xsd#type_DailyFrmThresholdPrices 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