generated: '2026-09-17'
method: searched
source: >-
  https://developer.seismic.com/seismicsoftware/reference/versioning ,
  https://developer.seismic.com/seismicsoftware/changelog , https://status.seismic.com/ ,
  https://developer.seismic.com/seismicsoftware/docs/app-versioning
description: >-
  Seismic publishes a written versioning and deprecation policy, a dated changelog, an Atlassian
  Statuspage, and a separate sandbox domain for pre-release testing. It does not publish an SLA
  document or RFC 8594 Sunset/Deprecation headers.
versioning:
  scheme: per-route
  current_major: v2
  policy_url: https://developer.seismic.com/seismicsoftware/reference/versioning
  rules:
  - >-
    "No new input will be added on a particular API version that would cause prior use of the API
    to fail, however, new optional fields can be added from time to time."
  - >-
    "Additional fields can be added to API responses at any time, however, existing fields will not
    be removed or fundamentally change purpose."
  - >-
    "Each route should be considered to be versioned independently of all other routes, although in
    practice, many routes will version together."
  note: >-
    Because routes version independently, a client cannot infer compatibility from a single version
    number in the base path; the base path carries /integration/v2 but individual routes move on
    their own schedule.
deprecation:
  policy: true
  policy_url: https://developer.seismic.com/seismicsoftware/reference/versioning
  window: >-
    "a route will continue to be available for anywhere from 1 to 12 months after announcing
    deprecation depending on the severity of the change."
  posture: >-
    "In practice, Seismic strives to avoid deprecating APIs except when extremely necessary."
  headers:
    sunset: false
    deprecation: false
    note: >-
      No Sunset or Deprecation response header is documented, and none appears in any OpenAPI
      document in this repo. Deprecation is announced in the changelog and in the reference, so an
      agent cannot detect it at runtime.
  deprecated_operations_in_spec: 0
  deprecated_documented:
  - name: Delivery approval v1
    url: https://developer.seismic.com/seismicsoftware/docs/delivery-approval-v1-deprecated
    detail: Superseded by https://developer.seismic.com/seismicsoftware/docs/delivery-approval
  - name: Legacy webhooks
    url: https://developer.seismic.com/seismicsoftware/docs/legacy-webhooks-1
    detail: Superseded by the current events/webhooks surface.
  - name: Legacy email and LiveSend summary events
    url: https://developer.seismic.com/seismicsoftware/docs/email-legacy-1
    detail: >-
      email-legacy-1, livesend-summary-v2 and interaction-session-summary-legacy are carried under
      an explicit Legacy grouping in the events documentation.
status_page:
  url: https://status.seismic.com/
  provider: Atlassian Statuspage
  probed: '2026-09-17'
  http_status: 200
  machine_readable: true
  note: Statuspage exposes the standard /api/v2/status.json and /history.atom surfaces.
changelog:
  url: https://developer.seismic.com/seismicsoftware/changelog
  cadence: weekly release notes, roughly 2 per month
  artifact: changelog/seismic-changelog.yml
sla:
  published: false
  note: No public SLA document. Availability commitments are negotiated in the enterprise contract.
environments:
- name: production
  base: https://api.seismic.com/
- name: sandbox
  base: https://api-sandbox.seismic.com
  detail: >-
    "Seismic will often make changes available on a separate domain for testing prior to release"
    — https://api-sandbox.seismic.com, named on the versioning page.