FIX API vs. REST API

The difference between FIX API and REST API is as follows:

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FIX API

The FIX API uses FIX (Financial Information eXchange), a standard protocol which can be used to enter orders, submit cancel requests, and receive fills. Users of the FIX API will typically have existing software using FIX for order management. Users who are not familiar with FIX should first consider using the REST API.

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REST API

The REST API includes standard endpoints that are used by a wide variety of web services.