When does Tardigrade calculate the amount of storj to be sent?


I am curious.
Since cryptocurrencies are very volatile, the amount of Storj coins each storage node receives depends a lot on coins price.
So I am curious.
When does Tardigrade make the conversion US Dollar / Storj?
Is it exactly when the storj coins are sent to the storage node?
Or is it at the first day of the next month (even if the money would be sent few days later)?
Or is it at another time?

Thanks guys!


At the time of sending.