Hello @9dhfju4, Thank you for your Futures trading FIX API questions. Let me provide you with a few options for the APIs available.
CTS-T4 FIX API You can look at the specs here: https://optimusfutures.com/CTS-API.php
Rithmic R Protocol it can work with FIX API Protocol. https://optimusfutures.com/Rithmic-Market-Data.php
TT FIX API is expiring at 2020. Although some FCMs may choose to support it, it will not have any updates or improvements from TT. We at Optimus Futures will not take customers under the TT FIX API because if the trading software provider does not support it, then it would make sense to place customers under it. As far as we know TT moved to the TT® REST API environment and if you insist on TT, then we suggest you move to the new environment.
CQG does offer the FIX API but for trading only, but they do not provide the FIX API for data.
If you wish to have to trade data and order routing, they do it via WEB API only.