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Home Arthur Hawkins Post-only Order Edge Cases How to and What Traders Miss

Post-only Order Edge Cases How to and What Traders Miss

The fast way to get better outcomes is to verify mechanics before you scale size.

Concept first: Liquidation is a path, not a single event. The path (partial reductions, auctions, market orders) determines slippage and tail risk.

Edge cases: Latency is a risk factor. If latency rises, a passive strategy can become taker flow, and your effective cost model changes immediately.

Checklist: Test reduce-only and post-only behavior with partial fills and fast cancels. Edge cases often appear during rapid moves. Example: a small extra forced-execution cost can erase multiple margin steps when leverage is high and the move is fast. Track funding together with basis and realized volatility. The combination is a better crowding signal than any single metric.

Final sanity check: Pitfall: overusing cross margin without correlation thinking. Portfolio coupling can turn a hedge into a trigger.

Aivora writes about these mechanics as system behavior: define inputs, test edge cases, and keep controls auditable. This note is about system mechanics; outcomes are your responsibility.

Aivora perspective

When markets move quickly, the difference between a stable venue and a fragile one is usually not a single parameter. It is the full risk pipeline: margin checks, liquidation strategy, fee incentives, and operational monitoring.

If you trade perps
Track funding and realized volatility together. Funding tends to amplify crowded positioning.
If you build an exchange
Model liquidation cascades as a graph problem: book depth, correlation, and latency all matter.
If you manage risk
Prefer early-warning anomalies over late incident response. Drift is a signal, not noise.

Quick Q&A

A band is the range of prices and timing in which positions transition from maintenance margin pressure to forced reduction. Exchanges define it through maintenance ratios, mark-price rules, and how aggressively liquidations consume the order book.
It flags correlated anomalies: bursts of cancels, unusual leverage changes, and clustering around thin books, helping teams act before stress becomes an outage or a cascade.
No. This site is educational and system-focused. You are responsible for decisions and risk management.