There is a way to have red card information for an football event.
Unfortunately, this is not something you can get via the API at the moment.
If there’s a red card during an event, are all the market prices instantly changed?
It depends on the people who are offering odds - we do not have any control over prices. I can tell you that all unmatched bets would be cancelled during a red card incident and any orders with a keep-in-play setting on, remain in the market.