A spot market with USDC in its name can still let you trade with USD. That distinction matters if your bot used OKX's affected USD spot markets.

OKX's September 30 update says those markets have moved to the corresponding USDC names. The old names won't redirect. Change only the market name in the bot, though, and an order that leaves the currency unspecified now defaults to USDC.

USD can still be requested explicitly where the market supports it.

I'd check the order's currency separately from its market name before restarting. Prices coming through again wouldn't answer that question: does the next order request USD, or has it quietly fallen back to USDC?