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# Messages

As defined in the FIX protocol, TDX API FIX server is using two different data levels: Session and Application.
The Session level handles the delivery of data and the Application level defines the business-related data content.
The following session and application messages are supported by TDX API FIX Engine:

* [Session messages](/prime/docs/fix-mess-session-messages)
* [Marketdata messages](/prime/docs/fix-mess-marketdata-messages)
* [Trade messages](/prime/docs/fix-mess-trade-messages)