How do margin calls work these days?

[biophil]

There are still bids above the call price... so the call has not been triggered.   The feed price protects only when there are no bids above it.   

There are ~$10K BitUSD for sale at above the margin call price.... once those are purchased a margin call will execute.

Cool, thanks for the quick response. I wish I'd known that before this morning's price crash.

[bytemaster]

There are still bids above the call price... so the call has not been triggered.   The feed price protects only when there are no bids above it.   

There are ~$10K BitUSD for sale at above the margin call price.... once those are purchased a margin call will execute.

[biophil]

As I understand it, margin calls execute based on the median price feed, right? Is there a delay before a margin call executes? I'm guessing we've seen a pile of margin calls today, but currently the price feed for USD is around 59.1 but there's a margin order with a call price of 58.15. When will that order execute?

Also, does the automatic margin call buy up asks one-by-one or does it place an order at the feed price and blow a ton of the shorter's collateral by overlapping orders?

Basically, I'm realizing that I have absolutely no idea how automatic margin calls have been implemented. Anyone care to point me in the right direction?