Exchange Trade Rollbacks, Reimbursements, and Market Finality
Summary
The document compares exchange rollbacks, which erase trades from a past interval, with reimbursements that compensate affected traders while leaving executions and account records intact. It describes circumstances that can prompt disputes, including isolated market orders that create extreme prices and faulty or manipulated index inputs that trigger liquidation cascades. Historical cases from OKEX, Coinbase, and Deribit illustrate different responses: one rollback, a decision to honor trades followed by company-funded compensation, and compensation after an index calculation failure.
The central market structure issue is how to balance relief for traders harmed by abnormal prices with trade finality for those who traded against them. Finality supports market makers who hedge across venues because confirmed trades give them dependable exposure; rollbacks may complicate those hedges unless exchanges can implement and communicate them quickly. The article also argues that rules differ across markets and jurisdictions, making a single policy difficult. These examples are historical case studies, not a universal rule or quantitative comparison of outcomes. The preferred response can depend on the cause, exchange rules, and effects on other participants.
Key ideas
- A rollback removes trades and their balance effects from a defined past interval.
- Abnormal prices can arise from outsized orders or unreliable index inputs and may trigger liquidations.
- Reimbursement can compensate affected traders while preserving the history and finality of trades.
- Trade finality helps market makers manage cross-exchange hedges and know their risk exposure.
- Rollback and compensation policies vary by market, incident, and stakeholder priorities.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.