Before a trading API is trusted with live orders, it should be tested under normal conditions, error conditions, disconnects, rate limits, and reconciliation workflows. API quality is proven through behavior, not just documentation.
Validate the full order lifecycle
Tests should cover order submission, acceptance, partial fills, full fills, cancellation, replacement, rejection, expiration, and duplicate prevention. The platform should know exactly how each state appears and how to respond.
Stress rate limits and reconnect behavior
Trading systems need to understand what happens when requests are throttled, websockets disconnect, tokens expire, or the broker returns delayed data. Recovery behavior should be tested before live deployment.
Reconcile account state after every scenario
After tests, internal state should match broker state for cash, positions, orders, and fills. Reconciliation catches subtle mismatches that can later become duplicate trades or incorrect risk reporting.
Strategic takeaway
Trading API testing should prove that the system can handle imperfect conditions. Live markets will eventually test the edge cases too.
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