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Pay once, pay per order: where the time actually goes between you and a venue
A trading connector spends time in two very different ways. Some costs are paid once per connection; some are paid on every order. Mixing them is the most common reason latency work goes nowhere.
Clock skew and signed requests: why a venue rejects your perfectly valid order
Every signed request carries a timestamp, and every venue has an opinion about how far from its own clock that timestamp may be. The error messages rarely say "your clock is off". Here is what they say instead, and how to make the problem go away for good.