generated: '2026-07-22'
method: searched
source: openapi/marketstack-v2-openapi.json
docs: https://docs.apilayer.com/marketstack/docs/api-documentation
summary:
  types:
  - apiKey
  api_key_in:
  - query
schemes:
- name: ApiKeyQuery
  type: apiKey
  in: query
  parameter: access_key
  description: >-
    Your Marketstack API access key. Every API request is authenticated by
    passing the account's API access key to the access_key query parameter
    (format: access_key=YOUR_ACCESS_KEY). Keys are issued on signup and can be
    reset at any time from the account dashboard; the docs warn never to expose
    the key publicly. Unauthenticated requests receive HTTP 401 with error
    codes missing_access_key or invalid_access_key (verified by live probe
    2026-07-22).
  sources:
  - openapi/marketstack-v2-openapi.json
  - https://docs.apilayer.com/marketstack/docs/api-documentation
notes: >-
  No OAuth, no scopes - a single account-level API key governs access; plan
  tier (Free through Enterprise) determines which endpoints and features the
  key can reach (higher-tier endpoints return 403 function_access_restricted).
  HTTPS is supported on all current plans per the 2026 pricing page.