Cryptocurrency addresses follow a particular format which can usually be identified by the first 1 or 2 characters in the address. For example, BTC addresses start with a ‘3’ and LTC addresses starts with an ‘M’. Tokens that are based on the ERC-20 standard, that use the Ethereum blockchain, will have the 0x prefix. USDC is ERC-20, I believe, so assuming that you gave the correct address, then there should be no issues with sending funds back to CoinBasePro unless Coinexx is not properly set up for that yet.
I will also add, for anyone that may not be overly familiar with crypto, that when you copy/paste your address, always double-check your address to ensure that it does not change when you paste it somewhere. There are some malicious programs that are being written that can monitor and alter that clipboard data so that you end up sending your money to some scammer. They are intelligently-designed, too, in that they will scan your address and pair it with one of the hundreds of thousands of addresses that they have set up for this, so that it matches closely, so that lazy people can still get duped by only double-checking the first, few digits.
Such malware is not so common, but it is always a good idea to double-check your addresses anyway, since most cryptocurrency transfers cannot be reversed.