generated: '2026-07-27'
method: derived
source: openapi/trolie-standard-openapi.yml
note: >-
  SPP publishes no numeric rate limits for any of its APIs. The only rate-limit
  contract in scope is the signalling defined by the LF Energy TROLIE
  specification that SPP's LEP/TROLIE Data Exchange Guide adopts: every response,
  success or failure, carries the three X-Rate-Limit-* headers, and an exhausted
  quota returns 429 with Retry-After. No limit counts are recorded below because
  none are published — an implementation supplies its own values at runtime. The
  anonymous public-data surface (FTP, file-browser-api, chart-api) returned no
  rate-limit headers at all on 2026-07-27 and no limits are documented for it.
signalling:
  standard: LF Energy TROLIE 1.1.0
  headers:
  - name: X-Rate-Limit-Limit
    meaning: the number of allowed requests in the current period
  - name: X-Rate-Limit-Remaining
    meaning: the number of remaining requests in the current period
  - name: X-Rate-Limit-Reset
    meaning: the number of seconds left in the current period
  - name: Retry-After
    meaning: returned with 429 Too Many Requests
  exhausted_status: 429
  applied_to: all 28 operations in the specification, on every documented response
  polling_guidance: >-
    The specification directs clients to poll snapshot endpoints with a
    conditional GET (If-None-Match against the previous ETag) so that unchanged
    snapshots return 304 and do not consume the request budget unnecessarily.
limits: []
published_limits: false
surfaces:
- api: spp:spp-lep-trolie-api
  limits_published: false
  signalling: true
- api: spp:spp-portal-file-browser-api
  limits_published: false
  signalling: false
  observed: no rate-limit headers on any of the eight datasets probed 2026-07-27
- api: spp:spp-portal-chart-api
  limits_published: false
  signalling: false
- api: spp:spp-public-data-ftp
  limits_published: false
  signalling: false
- api: spp:spp-price-contour-map-arcgis
  limits_published: false
  signalling: false