The Foreign Exchange (FX) Cross Rate Service synthetic datasource, connects to either one or two underlying sessions (which may be either an IAF adapter or another synthetic datasource), and calculates a "synthetic cross" based on two separate currency pairs and re-publishes them within the correlator. For example, use EUR/USD and USD/JPY as a means of publishing the synthetic cross rate of EUR/JPY.

The Synthetic Cross Rate Service supports connections to sessions which have the following datastream capabilities, and will attempt to connect to them in the following order of priority: