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: TU Dresden
providerId: tu-dresden
created: '2026-06-03'
modified: '2026-08-30'
reconciled: false
tags:
- Education
- Higher Education
- University
- Rate Limiting
description: >-
  TU Dresden publishes no unified rate-limit table across its APIs, but two of its surfaces do
  state a limit in their own documentation and both were confirmed on 2026-08-30. Open metadata
  and harvesting endpoints (OPARA and Qucosa OAI-PMH, the OPARA DSpace REST API) publish no
  numeric limit and may throttle large-scale harvesting; clients should harvest politely, honor
  Retry-After, and contact the service for bulk access.
notes: >-
  Confirmed per-service, 2026-08-30. No 429 was observed on any surface during probing; the two
  documented limits below are the institution's own statements, not measurements.
sources:
- https://raw.githubusercontent.com/api-evangelist/tu-dresden/refs/heads/main/apis.yml
responseCodes:
  throttled: 429
limits:
- name: TUD:AI Self-Service key
  surface: tu-dresden:tud-ai-llm
  scope: api-key
  metric: requests-per-minute
  limit: restrictive default, value not published
  notes: >-
    TU Dresden's documentation at https://llm.scads.ai/docs/usage/api/ states that keys created
    through the Self-Service Portal "come with a restrictive request-per-minute limit by default"
    and that higher limits are available on request. The number itself is not published.
- name: Lecture Catalog minimum interval
  surface: tu-dresden:lecture-catalog
  scope: client
  metric: seconds-between-requests
  limit: 10
  notes: >-
    The lecture directory API documentation at https://vvz.phil.tu-dresden.de/api requires at
    least ten seconds between calls. Enforcement was not tested.
- name: Default
  scope: client
  metric: requests-per-minute
  limit: see service documentation
  notes: No published global limit; large harvests may be rate-limited.
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