specification: API Commons Rate Limits
specificationVersion: '0.1'
schema: https://raw.githubusercontent.com/api-evangelist/interface-research/main/schema/api-commons.yml#/$defs/RateLimits
provider: University of Toronto
providerId: university-of-toronto
created: '2026-06-03'
modified: '2026-08-19'
reconciled: false
tags:
- Education
- Higher Education
- University
- Rate Limiting
generated: '2026-08-19'
method: probed
source: >-
  Live probes of https://api.easi.utoronto.ca/ttb and the TSpace OAI-PMH endpoint on 2026-08-19.
  No rate-limit header, quota header or Retry-After was returned on any successful response, and
  the University publishes no rate-limit statement for any API.
x-operator: institution
description: >-
  The University of Toronto publishes no rate limits for any of its APIs. On 2026-08-19 the
  institution-operated Timetable Builder API at api.easi.utoronto.ca returned HTTP 200 to every
  probe with no X-RateLimit-*, no Retry-After and no quota signalling of any kind, including for
  POST /ttb/getCourses which returns a 12.9 MB uncompressed body. The absence of a stated limit is
  not permission for volume: treat the surface as an unmetered application back-end, prefer
  getPageableCourses over getCourses, and expect no warning before throttling or blocking. Tenant
  surfaces on Scholaris and Borealis are governed by those platforms' policies, not the
  University's.
notes: >-
  No limit is documented and none was observed. Any figure below is guidance from API Evangelist,
  not a University of Toronto commitment.
sources:
- https://raw.githubusercontent.com/api-evangelist/university-of-toronto/refs/heads/main/apis.yml
responseCodes:
  throttled: 429
limits:
- name: Default
  scope: client
  metric: requests-per-minute
  limit: none-published
  observed: no rate-limit or quota header on any 200 response probed 2026-08-19
  notes: >-
    No published global limit and no observed enforcement. Harvest conservatively; the surface is an
    application back-end for a single official UI, not a metered product.
policies:
- name: Backoff Strategy
  description: Exponential backoff with jitter; honor Retry-After; harvest during off-peak hours.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com