specification: API Commons Rate Limits
specificationVersion: '0.1'
provider: OSFI
providerId: osfi
generated: '2026-07-25'
method: probed
created: '2026-07-25'
modified: '2026-07-25'
description: No rate limit is published for the CKAN Action API serving OSFI's data, and no RateLimit-*
  or Retry-After headers are returned (verified 2026-07-25). What IS enforced is a WAF that rejects non-browser
  User-Agents, and page-size caps on the read actions.
sources:
- https://docs.ckan.org/en/2.10/api/index.html
- https://open.canada.ca/data/en/api/3/action
responseCodes:
  throttled: null
  waf_rejection: HTTP 200 with an HTML 'Request Rejected' body
headers: []
limits:
- name: datastore_search page size
  scope: request
  metric: records-per-response
  limit_count: 100
  notes: CKAN default limit when none is supplied; pass a larger limit explicitly and page with offset.
- name: package_search page size
  scope: request
  metric: rows-per-response
  limit_count: 1000
  notes: CKAN's ckan.search.rows_max default.
- name: Requests per client
  scope: client
  metric: requests-per-minute
  limit_count: null
  notes: None published; none observed.
policies:
- name: Browser User-Agent required
  description: 'Requests with a default curl/script User-Agent are answered with an HTML WAF page under
    HTTP 200. Send a browser User-Agent and assert Content-Type: application/json before parsing.'
- name: Backoff strategy
  description: Exponential backoff with jitter on 5xx; harvest large return series (the PC1 resource alone
    is 693,693 records) in offset pages rather than one call.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com