Every StaxInvesting article tagged order management · 12 posts.
12 articles
Copy trading is the arrangement; a trade copier is the mechanism. The copier determines sizing, filtering, timing, and error handling — which is to say it determines most of the difference between two followers of the same provider.
Most of what goes wrong in copy trading is not misconduct. It is latency and translation. Following a signal from the provider's decision to a fill in the follower's account is what makes the risk picture make sense.
Order state is the part of trading automation most likely to be modelled as a boolean and most likely to punish that — starting with the fact that a successful response is not a fill.
Reconciliation is the least glamorous part of trading automation and the one that separates a system that works from one that works until it does not.
The structure you intend and the order you submit are different things — and multi-leg execution is exactly where the gap between them causes damage.
For automation, rejections are diagnostic rather than catastrophic — provided the system knows which ones are worth retrying and which will never succeed no matter how often you ask.
For a person watching a screen a partial fill is a minor annoyance. For automation it is a state divergence, and the error compounds through every subsequent decision rather than staying contained.
Platforms describe this as a minor caveat. It is the mechanism that determines whether a good provider produces good follower outcomes — and if a strategy's edge is thinner than its replication cost, it is profitable for the provider and not for you.
A Python script should say what it observed, not decide how much capital to commit. Routing signals through a receiver keeps credentials, sizing, and risk limits in one hardened component instead of copied across every strategy script.
Three of the four sources of duplicate trade signals are self-inflicted. Idempotency is not primarily an attack defence — it is protection against your own infrastructure behaving normally, in the one place where a repeated request costs money immediately.
Public.com runs a genuinely capable brokerage API with good tooling and unusual economics — options contracts traded through it earn a rebate rather than a commission. It also comes with a licensing term that decides whether it fits what you are building at all.
The tastytrade order format is simple enough to get subtly wrong in ways that never throw an error. Per-unit pricing, the debit and credit sign convention, accepted versus filled, and what to do when a submission times out and you do not know whether it landed.
