generated: '2026-07-22'
method: derived
source: openapi/dxfeed-fundamentals-openapi.json + kb.dxfeed.com REST docs + asyncapi/dxfeed-dxlink-asyncapi.yml
authentication:
  style: login/password credentials + entitlements (see authentication/dxfeed-authentication.yml); dxLink
    uses an AUTH token message
idempotency:
  supported: false
  note: No idempotency-key header or documented idempotency contract; read-heavy market-data surface.
pagination:
  style: none
  note: No cursor/offset pagination. The Fundamentals API bounds result sets with required date-range
    filters (fromYmd/toYmd) plus symbol/classification filters; the REST webservice returns snapshots
    per requested symbols/events.
filtering:
  params:
  - fromYmd
  - toYmd
  - symbols
  - sids
  - cids
  - currencyCode
  - countryCode
  - sicCodes
  - industryCodes
  - mics
  - sources
  note: Uniform filter parameter set across all Fundamentals dataset controllers.
resource_pattern:
  note: 'Every Fundamentals dataset exposes the same resource family: /recent/symbol/{symbol}, /symbol/{symbol},
    /filter (GET and POST), /recent/snapshot, /ymd/{ymd}, plus admin POST/DELETE manual-correction operations.'
content_negotiation:
  request_headers:
  - Accept-Encoding (declared required on every Fundamentals operation)
  formats:
    fundamentals: JSON
    rest_webservice: JSON or XML (.json/.xml suffix or Accept header)
    ipf: Instrument Profile Format (IPF) text
streaming:
  sse: /eventSource resource on the REST webservice streams Server-Sent Events
  websocket: dxLink protocol with multiplexed virtual channels (SETUP/AUTH/CHANNEL_REQUEST/FEED_SUBSCRIPTION
    messages)
versioning:
  style: uri-path
  current: v0.1 (Fundamentals); dxLink protocol version 0.1 negotiated in SETUP
error_envelope:
  shape: ApiError {httpStatus, timestamp, messages[], exMessage}
  see: errors/dxfeed-problem-types.yml
rate_limits:
  documented: false
  note: No public rate-limit headers or policy documented; capacity is entitlement-managed per contract.
request_tracing:
  documented: false
cross_links:
- errors/dxfeed-problem-types.yml
- authentication/dxfeed-authentication.yml
- lifecycle/dxfeed-lifecycle.yml