generated: '2026-07-27'
method: searched
source: >-
  https://www.misoenergy.org/markets-and-operations/RTDataAPIs/ (the 2025-12-12 restructure
  notice), https://api.misoenergy.org/MISORTWDDataBroker/data-links.html (the legacy surface,
  still reachable), https://help.misoenergy.org/knowledgebase/article/KA-01489/en-us,
  https://www.misoenergy.org/markets-and-operations/notifications/it-and-system-notifications/,
  https://www.misoenergy.org/markets-and-operations/MSE/, plus derivation from openapi/.
description: >-
  MISO versions its two public surfaces in two different ways and publishes neither policy
  formally. The Data Exchange gateway is versioned in the URI path at v1 and has not
  changed version. The Public API is versioned by announcement: on 2025-12-12 MISO moved it
  to a new host, changed every URL and dropped CSV and XML in favour of JSON only. There is
  no written deprecation policy, no RFC 8594 Sunset or Deprecation header support, no
  numeric SLA and no Statuspage-style uptime dashboard anywhere on any MISO host.

versioning:
  data-exchange:
    scheme: uri-path
    current: v1
    mechanism: /v1/ segment on every operation
    docs: https://data-exchange.misoenergy.org/apis
  public-api:
    scheme: none
    current: null
    effective_release: '2025-12-12'
    docs: https://www.misoenergy.org/markets-and-operations/RTDataAPIs/
    note: >-
      No version token in the URL and no version header. The harvested specification uses
      2025-12-12 as its info.version because that is the date of the restructure MISO
      announced, not a version MISO publishes.

deprecation:
  policy_url: null
  policy_published: false
  sunset_header: false
  deprecation_header: false
  note: >-
    MISO publishes no deprecation policy document, gives no advance-notice commitment, and
    emits neither the RFC 8594 Sunset header nor the Deprecation header. Deliberately
    recorded as absent — no Deprecation pointer is claimed in apis.yml.
  events:
    - date: '2025-12-12'
      kind: breaking-change
      surface: Public API
      announcement: https://www.misoenergy.org/markets-and-operations/RTDataAPIs/
      quote: >-
        "As of December 12, 2025, these data feeds are available in JSON format only.
        Please be aware that the underlying URLs have also changed for all links. This
        implementation is designed to improve consistency, performance, and future
        compatibility for accessing real-time data."
      impact:
        - Host moved from api.misoenergy.org/MISORTWDDataBroker to public-api.misoenergy.org
        - CSV and XML response formats withdrawn; JSON only
        - Every endpoint URL changed
      migration_guide: null
      grace_period: none published

retired_surfaces:
  - name: MISORTWDDataBroker
    url: https://api.misoenergy.org/MISORTWDDataBroker/data-links.html
    status: legacy — data-links page still returns HTTP 200 (verified 2026-07-27) but the
      data endpoints return {"error":"no data"}
    superseded_by: https://public-api.misoenergy.org/
    retired: '2025-12-12'

sla:
  url: null
  uptime_target: null
  note: >-
    No uptime commitment of any kind. MISO's published product terms are the opposite of an
    SLA — "MISO DOES NOT WARRANT THAT ITS SITES WILL BE UNINTERRUPTED OR ERROR-FREE ...
    distributed on an AS IS, AS AVAILABLE basis."

status_page: https://www.misoenergy.org/markets-and-operations/notifications/it-and-system-notifications/
status_page_kind: notifications-feed
status_page_note: >-
  MISO runs no Statuspage/Statusgator-style component dashboard — status.misoenergy.org does
  not resolve, and misoenergy.statuspage.io is an unclaimed Atlassian marketing redirect,
  not a MISO page. What MISO does publish is an IT and System Notifications feed where
  system outages, maintenance windows and incident notices are posted, times in Eastern.
  Retention is short and explicit: "all Notifications except Market Settlements
  Notifications will be deleted after 30 days of the issue date." That feed is recorded here
  as MISO's operational-status surface; the limitation is stated rather than papered over.

roadmap: https://www.misoenergy.org/markets-and-operations/MSE/
roadmap_note: >-
  The Market System Enhancements (MSE) programme is MISO's published forward-looking
  roadmap for the market systems that sit behind these APIs — Model Manager, the Day-Ahead
  and Real-Time Market Clearing Engines, the Operator Interface, an upgraded Energy
  Management System and the New Market User Interface (the MUI 2.0 surface in this
  profile). MISO publishes an MSE timeline graphic and gives quarterly stakeholder updates;
  RT-MCE is stated as expected to complete in 2026.

data_revision_policy:
  interchange_window_days: 105
  quote: >-
    "Data available within the interchange endpoints are subject to change up to 105 days
    after the market day due to reconciliation."
  source: MISO Data Exchange portal operation metadata

deprecated_operations: []
deprecated_operations_note: >-
  No operation in any of the four harvested OpenAPI documents carries deprecated: true.

change_log: null
change_log_note: >-
  MISO publishes no dated API changelog or release-notes feed for either the Public API or
  Data Exchange. The 2025-12-12 restructure was announced as page copy on the RT Data APIs
  page, not as a changelog entry. No ChangeLog pointer is claimed.