Research
Automated routing still fails when the path fails
An interface that accepts orders from software is a pipe into the broker’s systems. It inherits the broker’s permissions, the venue’s state and the chance that the session drops.
Key points
- An interface does not create a product the account is not allowed to trade.
- A dropped session can leave an order working, or can fail to send it. The specification says which.
- Keys and permissions are operational controls, not a strategy.
What is going on
Some firms publish an interface for orders, positions and market data. Access is usually keyed, limited by the account’s permissions, and documented with rate limits and error codes. A strategy running on a separate computer still depends on that session. Backtesting on stored prices is a different activity from sending a live order.
Why it matters
Automation adds failure modes: a key with too much permission, a loop that resubmits, a clock that disagrees with the venue, and a process that keeps running after the person has left. None of those are visible in a brochure that says the firm has an interface.
What to watch
Read which products the interface can touch, how an order is acknowledged, and what the firm says happens if the connection ends. Store credentials the way the firm’s security note describes.
Risks
A paper or simulated session is not the live entity. This note does not certify any firm’s interface or its uptime.
Related
Sources and review
Written by: WiT Markets Editorial. Writes and structures WiT Markets pages. Separates a sourced fact from a cell that is Not confirmed.
Review: Editorially reviewed. This is not a qualified specialist review and it is not a legal sign-off.
Last reviewed: . Next review due . The date is an editorial pass. It is not a live check of every third-party fee.
Regulatory and official sources
- FINRA — checked 13 October 2026
- U.S. Securities and Exchange Commission — checked 13 October 2026
Other sources
- WiT Markets methodology — checked 13 October 2026
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