Market Data Feed Handler
A Market Data Feed Handler is a specialized software or hardware component designed to ingest, parse, and normalize raw binary or text data streams from cryptocurrency exchanges. These feeds provide real-time information on order book updates, trade executions, and historical volume.
Because exchanges transmit massive amounts of data, the handler must be capable of processing millions of messages per second without dropping packets. It translates exchange-specific protocols into a standardized format that the trading engine can interpret for strategy evaluation.
Latency at this stage is fatal, as outdated market data leads to incorrect pricing and execution errors. Modern handlers often utilize zero-copy memory techniques to avoid redundant data movement within the system.
They are the primary interface between the external market environment and the internal quantitative logic of the trading firm. Maintaining synchronization with the exchange's state is the core challenge of feed handler engineering.