"Well then, whatever it is."
Nodding her head, Hecate said to Leto:
"You have something related to the moon, although I do not yet know what it is, I need it; I also want to know everything about Persephone, all that you know you must tell me; finally, this is the first and also the last thing I will do for you, after this, we are even."
"Even? What do you mean by even?"
Leto could understand the first two conditions. The godhood of deities could sometimes produce some unexpected senses, perhaps she indeed possessed some moon-related item that she was not aware of, and since the other party wanted it, she may as well give it to her. As for the whereabouts of Persephone, that was Hecate's 'Father God', and although it appeared that neither side recognized this connection much, Leto had no intention of concealing the other's whereabouts for her. Moreover, she herself was not very clear on Persephone's exact whereabouts.
But the last condition, had Hecate ever owed her anything?