generated: '2026-07-27'
method: searched
source: >-
  NYISO Finance APIs User's Guide v1.2 DRAFT, NYISO Metering API User Guide, the
  SDX Upload/Download Application Retirement notice, and anonymous probes of
  NYISO hosts on 2026-07-27
summary: >-
  NYISO versions its REST APIs in the URI path at v1 and has run one real
  retirement - the SDX Upload/Download application, replaced by the Finance APIs
  and switched off after 2025-09-17 following a market trial. It publishes no
  general API deprecation policy, no Sunset/Deprecation header support, no
  service level agreement for the APIs, and no status page. Grid conditions are
  published in real time on a public dashboard, but that is operations
  transparency, not API availability.

versioning:
  scheme: uri-path
  current: v1
  example: https://api.nyiso.com/finance/metering/v1/powerMetering
  docs: https://www.nyiso.com/manuals-tech-bulletins-user-guides
  policy_published: false
  note: >-
    Only v1 has ever been published. A separate payload-level "version" field
    identifies the invoice version of settlement data (0 = latest) and is not an
    API version.

deprecation:
  policy_url: null
  policy_published: false
  sunset_header: false
  deprecation_header: false
  retirements:
  - subject: SDX Upload/Download application
    replaced_by: NYISO Finance APIs (Metering, Settlements, Invoicing)
    sunset_date: '2025-09-17'
    announcement: https://www.nyiso.com/documents/20142/20259596/SDX-Upload-Download-Application-Retirement.pdf/93ebf171-b383-520d-b3af-00cb9f433d3c
    evidence: >-
      "Once testing is successful, market participants are encouraged to
      transition to the Finance APIs exclusively, in production, as SDX will no
      longer be available after 9/17/2025." The notice pairs the retirement with a
      market trial in a sandbox environment and a named contact channel.
    method: dated written notice with a market trial and a replacement API
  note: >-
    This is a real, dated retirement communication for a real interface, not a
    standing deprecation policy. NYISO does not publish a general deprecation
    window, a Sunset header contract (RFC 8594) or a version support matrix.

sla:
  url: null
  uptime_target: null
  note: >-
    No API service level agreement is published. NYISO's reliability obligations
    are tariff and FERC/NERC obligations on grid operation, not availability
    commitments on api.nyiso.com or mis.nyiso.com.

status_page: null
status_page_note: >-
  status.nyiso.com does not resolve and no /system-status page exists. The public
  Real-Time Dashboard at https://www.nyiso.com/real-time-dashboard reports grid
  conditions, not API or archive availability. Operational conditions affecting
  markets are communicated through Operational Announcements (MIS report P-25)
  and Dispatcher Notices rather than a developer status page.

change_communication:
  channels:
  - name: Manuals, Tech Bulletins and User Guides
    url: https://www.nyiso.com/manuals-tech-bulletins-user-guides
    note: Where the versioned API PDF guides are filed; the effective source of API change notice.
  - name: NYISO Operational Announcements (MIS report P-25)
    url: http://mis.nyiso.com/public/P-25list.htm
  - name: Stakeholder Services
    contact: Stakeholder_Services@nyiso.com / +1 518-356-6060
  dated_changelog_published: false
  note: >-
    The Finance APIs guide carries a Revision History table, but in the published
    v1.2 DRAFT the only row is "1.0 / MM/DD/YYYY / Initial Release" - the dates
    are unfilled template placeholders. There is no dated API changelog to
    capture, so no changelog/ artifact was written.

data_retention:
  rest_apis: >-
    Metering, settlements and invoicing data is retrievable for a rolling three
    year and ten month window ending with the current month.
  mis_public_archive: >-
    Daily files plus monthly ZIP bundles; several report families list files back
    to the early 2000s.
  oasis_postings: >-
    ATC/TTC posting keys observed dated from 1999-11-18 onward.

deprecated_operations: []