Yesterday, I was actually considering adding a note about the possibility of a minimum deposit in Coinbase but wherever I check (even in their help page), there's no hint of a minimum deposit amount.
I take that it'll be displayed below his Bitcoin deposit address if there is.
Yes, they haven't mentioned a minimum deposit limit on their help page, but I can see some other sources mentioned $10USD as minimum deposit limit not sure it's only applicable for fiat deposit or every deposit.
There is another way to deposit without going through all these if the sender is also sending funds from a coinbase account, they allow users to transfer funds within their platform using email at no fee.