Measure the whole order journey
Network round-trip time does not describe the complete experience. Measure request arrival, validation, bridge processing, provider acknowledgement, fill response and client delivery. Track distributions and tail latency, not just an average that hides the slowest sessions.
Build routing rules around evidence
Provider selection can consider available depth, instrument coverage, rejection behavior, response consistency, market conditions and contractual rules. A route that appears fastest during quiet hours may behave differently around news or thin liquidity.
- Track p50, p95 and p99 timing by session
- Separate technical rejects from market rejects
- Monitor fill ratio, slippage and partial fills
- Alert on stale quotes and disconnects
- Test provider failover and order-state reconciliation
Keep failover deterministic
Failover logic should protect order state, avoid duplicate submissions and make the operator’s view match what actually happened. Define when routing pauses, when orders may be retried, and what evidence is required before manual intervention.
The goal is not to chase the lowest single latency reading. It is to deliver consistent, explainable execution with a safe response when the normal route fails.
