Deposit of Lend Token on AAVE / aLend

I’m having an issue determining the cost basis of the following transaction. I deposited 1274 Lend on Aave (which became aLend tokens), but I don’t know how I should determine the cost basis of this deposit. As I didn’t do a real trade and as it’s a deposit, is it ok to say that the cost basis of this transaction is 0€ ?
Here’s a screenshot to give you more details about the issue I have :

Many thanks in advance for your help.