Identifiers

Client supplied identifiers

Tag	Name	Defined in	Echoed back	Description
320	SecurityReqID	Symbol List Request `<x>`	Symbol List `<y>`	The client's symbol list request identifier. Gemini does not enforce uniqueness although the FIX protocol recommends it.
262	MDReqID	Market Data Request `<V>`	Market Data – Snapshot/Full Refresh `<W>` Market Data – Incremental Refresh `<X>` Market Data Request Reject `<Y>`	The client's market data request identifier. Gemini requires uniqueness per active FIX session. A Market Data Request `<V>` message with a duplicate MDReqID `<262>` value during the current active FIX session will be rejected using a Market Data Request Reject `<Y>` with the MDReqRejReason `<281>` field set to `1` = Duplicate MDReqID `<262>`.

Last modified on October 8, 2025