generated: '2026-09-10'
method: searched
source: https://crustapi.com/docs
api: CrustAPI
model: concurrency
note: >-
  Limits are on in-flight (concurrent) requests per API key, not a requests-per-window
  quota. Volume is governed by credit balance, not a rate window. Empty/failed results are
  free and not billed.
limits:
- scope: per-key
  surfaces:
  - web
  - news
  concurrency_free: 2
  concurrency_paid: 5
  unit: in-flight requests
- scope: per-key
  surfaces:
  - images
  - shopping
  - videos
  - scholar
  - lens
  concurrency_free: 1
  concurrency_paid: 3
  unit: in-flight requests
- scope: per-key
  surfaces:
  - maps
  - places
  - reviews
  - autocomplete
  - patents
  - webpage
  - linkedin
  concurrency: unlimited
  note: No in-flight limit documented for these surfaces.
exhaustion:
  status: 429
  response_headers:
  - Retry-After
  note: Requests over the concurrency limit return 429 with a Retry-After header.
demo:
  endpoint: GET /v1/demo
  note: Public no-key demo is rate-limited (429 on exhaustion); exact numbers not published.
limit_count: 2