HKEX Orion Market Data Platform - Derivatives Market (OMD-D)
Real-time datafeeds (OMD-D DS, DP, DF tiers) for futures and options traded on the Hong Kong Futures Exchange, delivered in binary format over IP multicast/UDP with separate channel sets for stock options and non-stock options markets. Licensed, sales-gated access; the binary interface specification and developers guide are public PDFs.