CBOE API Systems Site

The CBOE Application Programming Interface (API) Systems Site


CBOE provides access to the API website for Members, Member Organizations, and Software Providers currently developing applications for Members or Member Organizations. Your request for access will be reviewed promptly and CBOE will contact you via email indicating the outcome.

If you are such a firm and do not yet have access, please click HERE to go the the registration page.  Access to all requesting parties is not guaranteed.

If you are already registered, click HERE to go to the login page.




  • -Version 1.0 of the API Specifications for the Vector Native Interface (VNI) for CFE is online. Click HERE to access the documentation. (1/29/16)

  • -API Specifications for the FIX 4.4 interface to Vector for CFE is online. Click HERE to access the documentation. (1/29/16)

  • -A draft specification for the Vector Streaming Markets (VSM) for CFE is available for your review and comments. The document is a working draft and is subject to change. Send your comments or questions about VSM to api@cboe.com Subject: VSM Comments, by February 26, 2016.

    Click HERE to access the Vector API site. (1/29/16)

CFLEX is the electronic system for trading Equity and Index FLEX options. The User Manual and the API used to access CFLEX are available here.  Registration to the CBOE API documentation web site is required in order to access the CFLEX API, click here to register.

CMI 2 (updated 10/26/15):
CMi 2 is a binary asynchronous message-based application programming interface implemented over TCP/IP that may be used to access CBOE Command - the electronic trading system for CBOE, C2 and CFE.

Financial Information eXchange (FIX) (updated 10/26/15):
Financial Information eXchange (FIX) Protocol is an application programming interface that may be used to access CBOE Command - the electronic trading system for CBOE, C2 and CFE. CBOE Command currently supports FIX Version 4.2 and Version 4.4.

Connectivity (updated 2/01/2016):
Information on how to establish test and production network connections to CBOE applications and services.

CBOE Financial Network (updated 12/07/2015):
Information on CBOE Streaming Market Data (CSM), Market Data Index dissemination (MDI) and CFE Market Data/Book Depth products.

Other CBOE APIs (updated 7/25/2012):
Documentation on the CWN, CTM and RTC-IP interfaces can now be accessed online.