Another Exchange Clock Service Hits the Trading Floor
Published Date: 3/31/2026
Notice
Summary
Cboe EDGX Exchange is launching a new Clock Service that helps traders and firms sync their clocks with the Exchange’s time. This makes tracking orders and messages super accurate and easier for everyone involved. The service is optional, open to all, and already effective as of March 17, 2026—no extra fees mentioned yet, but it’s a smart move for anyone serious about timing.
Analyzed Economic Effects
5 provisions identified: 4 benefits, 1 costs, 0 mixed.
Optional Exchange Clock Service Launched
If you run a trading firm, the Cboe EDGX Exchange began offering an optional Clock Service effective March 17, 2026. The service uses White Rabbit and Precision Time Protocol and provides a 1 Gbps physical port so subscribers can synchronize their primary clock to the Exchange's primary clock at up to sub-nanosecond precision.
Better Latency Measurement and Optimization
If you subscribe, the Clock Service lets you compare your timestamps to the Exchange's timestamps so you can tell whether time differences are latency or clock offset. That helps you analyze network efficiency, rebalance orders across connections, and potentially optimize trading models.
Hardware and Licensing Requirements
Subscribers that do not already have a White Rabbit clock device must buy one from a third-party vendor and procure any applicable licenses to use it. The Exchange will include a dedicated 1 Gbps Physical Port for the Clock Service, but the Exchange says it will file a separate rule change later to propose fees for the service.
Compliance and Surveillance Support
Subscribers may use the Clock Service to help evaluate compliance with clock synchronization requirements and for trade surveillance purposes. The Exchange states the service could assist subscribers in determining compliance with certain rules (for example, Rule 4.6).
Nanosecond Timestamp Precision Coming Soon
The Exchange will provide time-of-receipt timestamps at the nanosecond level by the end of March 2026, improving the granularity of timing information subscribers receive. This change complements the Clock Service by making Exchange timestamps more precise for latency comparisons.
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