generated: '2026-09-06'
method: searched
source: https://clinicaltrials.gov/about-site/terms-conditions
plan_count: 1
pricing_model: free-public-service
note: >-
  ClinicalTrials.gov publishes no commercial pricing because it is a U.S. Government public
  data service, not a product. There are no tiers, no metering, no quota purchase and no
  enterprise contact-sales path. This is a genuine zero-cost plan, not an undisclosed one —
  the terms state it explicitly.
plans:
- name: Public access
  price: 0
  currency: USD
  billing_period: none
  quota: unlimited
  quota_note: >-
    No published request quota, no per-key allowance and no metering. The only pace signal
    published anywhere is "Crawl-delay: 1" in https://clinicaltrials.gov/robots.txt, which
    addresses crawlers rather than API clients (and the same file disallows /api/ to
    crawlers). See rate-limits/clinical-trials-gov-rate-limits.yml.
  overage: none
  limits:
    page_size_max: 1000
    page_size_default: 10
    limits_source: openapi/_original/clinical-trials-gov-openapi.yml components.parameters.PageSize
  onboarding: none
  signup_required: false
  evidence: >-
    "ClinicalTrials.gov data are available to all requesters, both within and outside the
    United States, at no charge." — https://clinicaltrials.gov/about-site/terms-conditions
    (probed 2026-09-06, HTTP 200)