LTC. I have had 3 other buys/sells that went through normally, but one buy for approx $1k LTC @ ~$100 is stuck and my support request is sitting with no response. They don't respond to requests and so far haven't even acknowledged a backlog of pending buys, despite daily messages of various delays and outages. Could they be tying up customer funds on purpose?
https://www.reddit.com/r/CoinBase appears to be riddled with similar issues. Good luck. At least you're not the guy whose $800K withdrawal has been pending since 12/22, also with no response from support.