I've worked in this space before (though ~5 years ago), and I would say that most of the solutions are so unsophisticated that any measures to prevent this, lik

I've worked in this space before (though ~5 years ago), and I would say that most of the solutions are so unsophisticated that any measures to prevent this, like the ones you propose, would likely be completely overkill. AFAIK, there have also been some safeguards added into the MWS API itself, which prevent too drastic price changes to be uploaded, which prevent those bugs from surfacing nowadays.