generated: '2026-08-13'
method: searched
source: https://developer.act-on.com/reference/api-overview + https://developer.act-on.com/reference/overview
  + https://status.act-on.com + openapi/ + https://connect.act-on.com/hc/en-us/categories/13386837131927-What-s-New
api: Act-On REST API
summary: >-
  Act-On versions in the URI path and runs four differently-versioned surfaces side
  by side. It publishes no deprecation policy, sets no Sunset or Deprecation header,
  and marks not a single operation deprecated across 158 published operations — while
  simultaneously shipping a "legacy" generation (/api/1) alongside its replacement
  (/ucl/v2) with no stated end date for either. A consumer has no published signal
  telling them which surface to build on or when the old one goes away.
versioning:
  style: uri-path
  header_negotiation: none
  surfaces:
  - {path_prefix: /api/1, name: Act-On REST API v1, info_version: '2.0', operations: 125,
    status: in-service, note: 'The original form-encoded API. Still fully documented
      and not marked deprecated, but its contact/list functions overlap with /ucl/v2.'}
  - {path_prefix: /ucl/v2, name: Act-On Contacts (UCL) v2, info_version: '2.0', operations: 46,
    status: in-service, note: 'The newer JSON contact/segment/import layer. Requires
      {accountId} in the path.'}
  - {path_prefix: /ete/v1, name: Transactional email, operations: 1, status: in-service,
    note: Requires a separate transactional subscription on the account.}
  - {path_prefix: /custom-objects/v1, name: Custom Objects Service, info_version: 3.4.3,
    operations: 24, status: beta, note: 'Act-On''s own docs say so: "Endpoints in this
      category are currently in BETA and are only available on request." Enrollment
      is by form.'}
beta_program:
  present: true
  surface: Custom Data / Custom Objects Service
  access: request-only, via an enrollment form
  url: https://developer.act-on.com/reference/overview
  evidence: '"Endpoints in this category are currently in BETA and are only available
    on request. If you''re interested in enrolling in this beta program and would like
    to test these endpoints, please fill out this form."'
deprecation:
  policy: not published
  sunset_header: not observed
  deprecation_header: not observed
  rfc8594: false
  deprecated_operations: []
  deprecated_fields:
  - {spec: openapi/act-on-custom-objects-service-openapi.yml, schema: DataQueryRequestDTO,
    fields: [page, size], note: 'Marked `deprecated: true` in the schema with "DEPRECATED:
      Use pagination object instead." The only deprecation marker anywhere in Act-On''s
      published contract, and it is at field level, not operation level.'}
  note: >-
    Zero of 158 operations carry `deprecated: true`. No sunset dates, no migration
    guide from /api/1 to /ucl/v2, and no changelog entry in the 2026 window announces
    any API change at all.
status_page:
  url: https://status.act-on.com
  vendor: Atlassian Statuspage
  machine_readable: https://status.act-on.com/api/v2/status.json
  history: https://status.act-on.com/history
  evidence: https://status.act-on.com/api/v2/status.json returns 200 with page id 2n7d73n45n13,
    name "Act-On Software"
  probe: {url: 'https://status.act-on.com/api/v2/status.json', status: 200}
changelog:
  url: https://connect.act-on.com/hc/en-us/categories/13386837131927-What-s-New
  cadence: continuous, dated, archived by year 2022-2026
  entry_count: 174
  api_scoped: false
  ref: changelog/act-on-changelog.yml
sla:
  published: false
  note: >-
    No public uptime SLA. Support Terms and Conditions are published as a PDF
    (https://act-on.com/wp-content/uploads/2023/02/Support-Terms-and-Conditions_2023-1.pdf);
    availability commitments appear only in the negotiated contract.
support:
  packages: https://act-on.com/product/services/support-packages/
  help_center: https://connect.act-on.com/hc/en-us
  developer_request: https://developer.act-on.com/reference/request-a-developer-account
probes:
- {url: 'https://status.act-on.com/api/v2/status.json', status: 200}
- {url: 'https://status.act-on.com/history', status: 200}
- {url: 'https://developer.act-on.com/reference/overview', status: 200}
- {url: 'https://developer.act-on.com/reference/api-overview', status: 200}
- {url: 'https://connect.act-on.com/hc/en-us/categories/13386837131927-What-s-New', status: 200}