generated: '2026-07-22'
method: searched
source: https://www.marketdata.app/docs/api/authentication/
docs: https://www.marketdata.app/docs/api/authentication/
summary:
  types:
  - http
  - apiKey
  api_key_in:
  - query
  oauth2_flows: []
schemes:
- name: bearerAuth
  type: http
  scheme: bearer
  description: >-
    Bearer token generated in the Market Data customer dashboard (delivered by
    email) and passed in the Authorization header. The token is a programmatic
    representation of the account credentials and must be kept secret.
  sources:
  - openapi/marketdata-app-openapi-original.yml
  - https://www.marketdata.app/docs/api/authentication/
- name: tokenQueryParameter
  type: apiKey
  in: query
  parameter: token
  description: >-
    A read-only access token may be supplied as a token query parameter for
    quick browser or spreadsheet use. The provider discourages this - tokens
    in URLs are exposed in server logs and caches - and recommends header
    authentication.
  sources:
  - https://www.marketdata.app/docs/api/universal-parameters/token/
policies:
  single_ip: >-
    Each account may only connect from one IP address at a time; switching
    back and forth between IPs within a 5-minute window triggers a temporary
    block (HTTP 403).
  demo_without_auth: >-
    Stock endpoints with AAPL, options endpoints with any AAPL contract
    (e.g. AAPL271217C00250000), and fund endpoints with VFINX work with no
    token at all (historical data only).