现代定价栈内部：从原始 feed 到图表，毫秒级

Every price on your chart made a journey: multiple upstream liquidity feeds are aggregated into a single clean book, sanity-checked against outliers, stamped, and fanned out over WebSocket to every open terminal. A well-run venue budgets the whole path in single-digit milliseconds.

Raw feeds misbehave: crossed quotes, stale reprints, fat-finger outliers. Roughly 0.3% of upstream ticks are rejected by our validation layer before they can ever reach a chart or trigger a stop. A bad tick that fills a client's stop is a breach of trust — filtering them is a correctness requirement, not an optimisation.

• Outlier gate: ticks beyond a dynamic band vs the consolidated mid are quarantined.
• Staleness gate: feeds that stop updating are weighted out of the book within 250 ms.
• Cross detection: bid ≥ ask from any single contributor drops that contributor, not the book.

Traders never see the bad ticks a venue rejects. That's the point.

— 设计原则