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They've been totally radio silent AFAICT on postmortem, causes, tech remediations, etc.. I'm definitely going to be downsizing my account with them (but will continue to use them for small but commission intensive trades).

I still see Cost basis issues. Not sure if anyone still have, you may need to see if the transactions happened on 10/17th cost basis are okay.

Yes, I've used it extensively. It works pretty well, although it has quirks around the JSON format (probably because they're using XML and some library that does a weird job converting it), so it will do things like return the literal string `"null"` and if you have one open order, return `"orders": {}` but if you have multiple that becomes an array, so just little inconsistencies like that. The documentation is adequate, not great. It is much less cumbersome and finicky than the IBKR TWS API.

I would suggest you to email them directly service@tradierbrokerage.com