generated: '2026-07-22'
method: searched
source: https://cmegroupclientsite.atlassian.net/wiki/spaces/EPICSANDBOX/pages/871366660/CME+Options+Analytics+-+Greeks+and+Implied+Volatility+REST+API
notes: >-
  CME Group publishes per-API revision histories on the Client Systems Wiki
  pages and dated operational notices on cmegroup.com/notices.html rather than
  a single consolidated changelog. Recent dated entries captured below from
  the wiki revision-history tables and notices.
scheme: per-API revision history tables + dated CME Group notices
entries:
  - date: '2025-10-30'
    api: Greeks and Implied Volatility REST API
    type: additions
    breaking: false
    highlights:
      - 'Updated parameters: Latest/History/Products header User-Agent; Latest body globexSym, impliedVolAsk, impliedVolBid; History body impliedVolAsk, impliedVolBid'
  - date: '2025-11-01'
    api: CME FedWatch Intraday API
    type: milestone
    breaking: false
    highlights:
      - Historical data for the FedWatch Intraday API commences on November 1, 2025
  - date: '2025-08-01'
    api: Greeks and Implied Volatility REST API
    type: initial-release
    breaking: false
    highlights:
      - Initial publication of the CME Options Analytics Greeks and Implied Volatility REST API
  - date: '2024-05-02'
    api: CME Reference Data API v3
    type: operational
    breaking: false
    highlights:
      - New CME Reference Data API Version 3 network connections notice
    source: https://www.cmegroup.com/notices/reference-data-api/2024/05/20240502a.html