How can I get OHLC for US session using Eikon Data API or Com API?
If you only need the latest values, you can use get_data method of Eikon Data APIs with spot FX RICs like EUR= and field names US_OPEN, US_HIGH, US_LOW and US_CLOSE.
If you need timeseries, you can use Eikon .NET APIs or you can use the pre-release of Refinitiv Data Platform library. For the latter see Historical Pricing - Interday Summaries example. Use FX RICs like EUR= and field names AMEROP_BID, AMERHI_BID, AMERLO_BID, AMERCL_BID.